add Yarn Berry (v2+) lockfile migration support

2026-02-16 22:01:47 +00:00 · 2025-12-01 01:37:30 +11:00
9 changed files with 3767 additions and 1740 deletions
--- a/src/analytics.zig
+++ b/src/analytics.zig
@@ -87,6 +87,7 @@ pub const Features = struct {
    pub var unsupported_uv_function: usize = 0;
    pub var exited: usize = 0;
    pub var yarn_migration: usize = 0;
+    pub var yarn_berry_migration: usize = 0;
    pub var pnpm_migration: usize = 0;
    pub var yaml_parse: usize = 0;
    pub var cpu_profile: usize = 0;
--- a/src/install/lockfile.zig
+++ b/src/install/lockfile.zig
@@ -114,7 +114,7 @@ pub const LoadResult = union(enum) {
    ok: struct {
        lockfile: *Lockfile,
        loaded_from_binary_lockfile: bool,
-        migrated: enum { none, npm, yarn, pnpm } = .none,
+        migrated: enum { none, npm, yarn, yarn_berry, pnpm } = .none,
        serializer_result: Serializer.SerializerLoadResult,
        format: LockfileFormat,
    },
@@ -208,6 +208,7 @@ pub const LoadResult = union(enum) {
                .pnpm => .{ .v1, true },
                .npm => .{ .v0, true },
                .yarn => .{ .v0, true },
+                .yarn_berry => .{ .v0, true },
            },
        };
    }
@@ -977,7 +978,16 @@ const PendingResolution = struct {

 const PendingResolutions = std.array_list.Managed(PendingResolution);

-pub fn fetchNecessaryPackageMetadataAfterYarnOrPnpmMigration(this: *Lockfile, manager: *PackageManager, comptime update_os_cpu: bool) OOM!void {
+pub const MigrationType = enum {
+    // pnpm needs to get dependencies from npm registry (it stores them under resolved without semver)
+    pnpm,
+    // yarn classic also needs to get os/cpu data from npm registry
+    yarn_classic,
+    // yarn berry only needs to get integrity data from npm registry
+    yarn_berry,
+};
+
+pub fn fetchNecessaryPackageMetadataAfterYarnOrPnpmMigration(this: *Lockfile, manager: *PackageManager, comptime migration_type: MigrationType) OOM!void {
    manager.populateManifestCache(.all) catch return;

    const pkgs = this.packages.slice();
@@ -986,28 +996,28 @@ pub fn fetchNecessaryPackageMetadataAfterYarnOrPnpmMigration(this: *Lockfile, ma
    const pkg_name_hashes = pkgs.items(.name_hash);
    const pkg_resolutions = pkgs.items(.resolution);
    const pkg_bins = pkgs.items(.bin);
-    const pkg_metas = if (update_os_cpu) pkgs.items(.meta) else undefined;
+    const pkg_metas = pkgs.items(.meta);

-    if (update_os_cpu) {
-        for (pkg_names, pkg_name_hashes, pkg_resolutions, pkg_bins, pkg_metas) |pkg_name, pkg_name_hash, pkg_res, *pkg_bin, *pkg_meta| {
-            switch (pkg_res.tag) {
-                .npm => {
-                    const manifest = manager.manifests.byNameHash(
-                        manager,
-                        manager.scopeForPackageName(pkg_name.slice(this.buffers.string_bytes.items)),
-                        pkg_name_hash,
-                        .load_from_memory_fallback_to_disk,
-                        false,
-                    ) orelse {
-                        continue;
-                    };
+    for (pkg_names, pkg_name_hashes, pkg_resolutions, pkg_bins, pkg_metas) |pkg_name, pkg_name_hash, pkg_res, *pkg_bin, *pkg_meta| {
+        switch (pkg_res.tag) {
+            .npm => {
+                const manifest = manager.manifests.byNameHash(
+                    manager,
+                    manager.scopeForPackageName(pkg_name.slice(this.buffers.string_bytes.items)),
+                    pkg_name_hash,
+                    .load_from_memory_fallback_to_disk,
+                    false,
+                ) orelse continue;

-                    const pkg = manifest.findByVersion(pkg_res.value.npm.version) orelse {
-                        continue;
-                    };
+                const pkg = manifest.findByVersion(pkg_res.value.npm.version) orelse continue;

-                    var builder = manager.lockfile.stringBuilder();
+                var builder = manager.lockfile.stringBuilder();

+                if (migration_type == .yarn_berry) {
+                    if (pkg_meta.integrity.tag == .unknown) {
+                        pkg_meta.integrity = pkg.package.integrity;
+                    }
+                } else {
                    var bin_extern_strings_count: u32 = 0;

                    bin_extern_strings_count += pkg.package.bin.count(manifest.string_buf, manifest.extern_strings_bin_entries, @TypeOf(&builder), &builder);
@@ -1022,53 +1032,17 @@ pub fn fetchNecessaryPackageMetadataAfterYarnOrPnpmMigration(this: *Lockfile, ma

                    pkg_bin.* = pkg.package.bin.clone(manifest.string_buf, manifest.extern_strings_bin_entries, extern_strings_list.items, extern_strings, @TypeOf(&builder), &builder);

-                    // Update os/cpu metadata if not already set
-                    if (pkg_meta.os == .all) {
-                        pkg_meta.os = pkg.package.os;
+                    if (migration_type == .yarn_classic) {
+                        if (pkg_meta.os == .all) {
+                            pkg_meta.os = pkg.package.os;
+                        }
+                        if (pkg_meta.arch == .all) {
+                            pkg_meta.arch = pkg.package.cpu;
+                        }
                    }
-                    if (pkg_meta.arch == .all) {
-                        pkg_meta.arch = pkg.package.cpu;
-                    }
-                },
-                else => {},
-            }
-        }
-    } else {
-        for (pkg_names, pkg_name_hashes, pkg_resolutions, pkg_bins) |pkg_name, pkg_name_hash, pkg_res, *pkg_bin| {
-            switch (pkg_res.tag) {
-                .npm => {
-                    const manifest = manager.manifests.byNameHash(
-                        manager,
-                        manager.scopeForPackageName(pkg_name.slice(this.buffers.string_bytes.items)),
-                        pkg_name_hash,
-                        .load_from_memory_fallback_to_disk,
-                        false,
-                    ) orelse {
-                        continue;
-                    };
-
-                    const pkg = manifest.findByVersion(pkg_res.value.npm.version) orelse {
-                        continue;
-                    };
-
-                    var builder = manager.lockfile.stringBuilder();
-
-                    var bin_extern_strings_count: u32 = 0;
-
-                    bin_extern_strings_count += pkg.package.bin.count(manifest.string_buf, manifest.extern_strings_bin_entries, @TypeOf(&builder), &builder);
-
-                    try builder.allocate();
-                    defer builder.clamp();
-
-                    var extern_strings_list = &manager.lockfile.buffers.extern_strings;
-                    try extern_strings_list.ensureUnusedCapacity(manager.lockfile.allocator, bin_extern_strings_count);
-                    extern_strings_list.items.len += bin_extern_strings_count;
-                    const extern_strings = extern_strings_list.items[extern_strings_list.items.len - bin_extern_strings_count ..];
-
-                    pkg_bin.* = pkg.package.bin.clone(manifest.string_buf, manifest.extern_strings_bin_entries, extern_strings_list.items, extern_strings, @TypeOf(&builder), &builder);
-                },
-                else => {},
-            }
+                }
+            },
+            else => {},
        }
    }
 }
--- a/src/install/pnpm.zig
+++ b/src/install/pnpm.zig
@@ -824,7 +824,7 @@ pub fn migratePnpmLockfile(

    try lockfile.resolve(log);

-    try lockfile.fetchNecessaryPackageMetadataAfterYarnOrPnpmMigration(manager, false);
+    try lockfile.fetchNecessaryPackageMetadataAfterYarnOrPnpmMigration(manager, .pnpm);

    try updatePackageJsonAfterMigration(allocator, manager, log, dir, found_patches);

--- a/src/install/resolution.zig
+++ b/src/install/resolution.zig
@@ -100,6 +100,372 @@ pub fn ResolutionType(comptime SemverIntType: type) type {
            };
        }

+        const FromYarnBerryLockfileError = OOM || error{InvalidYarnBerryLockfile};
+
+        /// Parse Yarn Berry resolution: "package@protocol:details" or "package@protocol:details::metadata"
+        pub fn fromYarnBerryLockfile(res_str: []const u8, string_buf: *String.Buf) FromYarnBerryLockfileError!Resolution {
+            const at_idx = strings.lastIndexOfChar(res_str, '@') orelse return error.InvalidYarnBerryLockfile;
+            var protocol_part = res_str[at_idx + 1 ..];
+
+            // Extract __archiveUrl from ::metadata if present (custom registry URLs)
+            var archive_url: ?[]const u8 = null;
+            if (strings.indexOf(protocol_part, "::__archiveUrl=")) |archive_idx| {
+                const encoded_url = protocol_part[archive_idx + "::__archiveUrl=".len ..];
+                protocol_part = protocol_part[0..archive_idx];
+                archive_url = encoded_url;
+            } else if (strings.indexOf(protocol_part, "::")) |idx| {
+                protocol_part = protocol_part[0..idx];
+            }
+
+            // npm:version
+            if (strings.withoutPrefixIfPossibleComptime(protocol_part, "npm:")) |version_str| {
+                const version_literal = try string_buf.append(version_str);
+                const parsed = Semver.Version.parse(version_literal.sliced(string_buf.bytes.items));
+                if (!parsed.valid or parsed.version.major == null or parsed.version.minor == null or parsed.version.patch == null) {
+                    return error.InvalidYarnBerryLockfile;
+                }
+
+                // Use custom registry URL if present
+                var url: String = .{};
+                if (archive_url) |encoded| {
+                    var decoded_buf: [2048]u8 = undefined;
+                    var decoded_stream = std.io.fixedBufferStream(&decoded_buf);
+                    const decoded_len = PercentEncoding.decode(@TypeOf(decoded_stream).Writer, decoded_stream.writer(), encoded) catch 0;
+                    if (decoded_len > 0) {
+                        url = try string_buf.append(decoded_buf[0..decoded_len]);
+                    }
+                }
+
+                return This.init(.{ .npm = .{ .version = parsed.version.min(), .url = url } });
+            }
+
+            // link:path -> symlink
+            if (strings.withoutPrefixIfPossibleComptime(protocol_part, "link:")) |path| {
+                return This.init(.{ .symlink = try string_buf.append(path) });
+            }
+
+            // file:path -> folder
+            if (strings.withoutPrefixIfPossibleComptime(protocol_part, "file:")) |path| {
+                return This.init(.{ .folder = try string_buf.append(path) });
+            }
+
+            // portal:path -> folder
+            if (strings.withoutPrefixIfPossibleComptime(protocol_part, "portal:")) |path| {
+                return This.init(.{ .folder = try string_buf.append(path) });
+            }
+
+            // github:owner/repo#ref
+            if (strings.withoutPrefixIfPossibleComptime(protocol_part, "github:")) |github_spec| {
+                return This.init(.{ .github = try Repository.parseAppendGithub(github_spec, string_buf) });
+            }
+
+            // git:url or git+protocol:url
+            if (strings.hasPrefixComptime(protocol_part, "git:") or strings.hasPrefixComptime(protocol_part, "git+")) {
+                return This.init(.{ .git = try Repository.parseAppendGit(protocol_part, string_buf) });
+            }
+
+            // https://.../*.git#... -> git resolution (github, gitlab, bitbucket, etc.)
+            if (strings.hasPrefixComptime(protocol_part, "https:") or strings.hasPrefixComptime(protocol_part, "http:")) {
+                if (strings.indexOf(protocol_part, ".git")) |git_idx| {
+                    const after_git = protocol_part[git_idx + ".git".len ..];
+                    const committish = strings.withoutPrefixIfPossibleComptime(after_git, "#commit=") orelse
+                        strings.withoutPrefixIfPossibleComptime(after_git, "#") orelse "";
+                    if (committish.len > 0) {
+                        const repo_url = protocol_part[0 .. git_idx + ".git".len];
+                        // GitHub: convert to github:owner/repo#commit format
+                        if (strings.withoutPrefixIfPossibleComptime(repo_url, "https://github.com/")) |path| {
+                            if (strings.indexOfChar(path, '/')) |slash_idx| {
+                                const owner = path[0..slash_idx];
+                                const repo = path[slash_idx + 1 .. path.len - ".git".len];
+                                const short_commit = shortCommit(committish);
+                                var resolved_buf: [256]u8 = undefined;
+                                const resolved_str = std.fmt.bufPrint(&resolved_buf, "{s}-{s}-{s}", .{ owner, repo, short_commit }) catch "";
+                                return This.init(.{ .github = .{
+                                    .owner = try string_buf.append(owner),
+                                    .repo = try string_buf.append(repo),
+                                    .committish = try string_buf.append(committish),
+                                    .resolved = if (resolved_str.len > 0) try string_buf.append(resolved_str) else .{},
+                                } });
+                            }
+                        }
+                        // Non-GitHub (gitlab, bitbucket, etc.): git+url#commit format
+                        return This.init(.{ .git = .{
+                            .repo = try string_buf.append(repo_url),
+                            .committish = try string_buf.append(committish),
+                            .resolved = try string_buf.append(committish),
+                        } });
+                    }
+                }
+                return This.init(.{ .remote_tarball = try string_buf.append(protocol_part) });
+            }
+
+            // Fallback: bare version without protocol (Yarn 2.x lockfiles v4/v5)
+            // e.g. "lodash@4.17.21" instead of "lodash@npm:4.17.21"
+            const version_literal = try string_buf.append(protocol_part);
+            const parsed = Semver.Version.parse(version_literal.sliced(string_buf.bytes.items));
+            if (parsed.valid and parsed.version.major != null and parsed.version.minor != null and parsed.version.patch != null) {
+                return This.init(.{ .npm = .{ .version = parsed.version.min(), .url = .{} } });
+            }
+
+            return error.InvalidYarnBerryLockfile;
+        }
+
+        fn extractPackageName(spec: []const u8) []const u8 {
+            const at_idx = if (strings.hasPrefixComptime(spec, "@"))
+                strings.indexOfChar(spec[1..], '@')
+            else
+                strings.indexOfChar(spec, '@');
+
+            if (at_idx) |idx| {
+                if (strings.hasPrefixComptime(spec, "@")) {
+                    return spec[0 .. idx + 1];
+                }
+                return spec[0..idx];
+            }
+
+            return spec;
+        }
+
+        fn shortCommit(committish: []const u8) []const u8 {
+            return if (committish.len > 7) committish[0..7] else committish;
+        }
+
+        fn appendShortCommit(committish: []const u8, buf: *String.Buf) !String {
+            return try buf.append(shortCommit(committish));
+        }
+
+        fn isDefaultRegistry(url: []const u8) bool {
+            return strings.containsComptime(url, "registry.yarnpkg.com") or
+                strings.containsComptime(url, "registry.npmjs.org");
+        }
+
+        pub fn fromYarnV1Spec(
+            first_spec: []const u8,
+            resolved: []const u8,
+            version: []const u8,
+            string_buf: *String.Buf,
+        ) FromYarnBerryLockfileError!struct { Resolution, String, u64 } {
+            const is_github_spec = strings.containsComptime(first_spec, "@github:");
+            const is_git_spec = strings.containsComptime(first_spec, "@git+");
+            const is_tarball_url_spec = strings.containsComptime(first_spec, "@http");
+
+            const real_name = blk: {
+                if (strings.containsComptime(first_spec, "@npm:")) {
+                    if (strings.hasPrefixComptime(first_spec, "@")) {
+                        if (strings.indexOfChar(first_spec, '@')) |first_at| {
+                            const after_first_at = first_spec[first_at + 1 ..];
+                            if (strings.indexOfChar(after_first_at, '@')) |second_at_in_substr| {
+                                const second_at = first_at + 1 + second_at_in_substr;
+                                if (strings.hasPrefixComptime(first_spec[second_at..], "@npm:")) {
+                                    const real_spec = first_spec[second_at + "@npm:".len ..];
+                                    const real_pkg_name = extractPackageName(real_spec);
+                                    break :blk real_pkg_name;
+                                }
+                            }
+                        }
+                    } else {
+                        if (strings.indexOfChar(first_spec, '@')) |at_pos| {
+                            const after_at = first_spec[at_pos + 1 ..];
+                            if (strings.hasPrefixComptime(after_at, "npm:")) {
+                                const real_spec = first_spec[at_pos + "@npm:".len ..];
+                                const real_pkg_name = extractPackageName(real_spec);
+                                break :blk real_pkg_name;
+                            }
+                        }
+                    }
+                }
+                break :blk extractPackageName(first_spec);
+            };
+
+            var real_name_hash = String.Builder.stringHash(real_name);
+            var real_name_string = try string_buf.appendWithHash(real_name, real_name_hash);
+
+            var res: Resolution = undefined;
+
+            if (is_github_spec) {
+                const at_github_idx = strings.indexOf(first_spec, "@github:") orelse {
+                    return error.InvalidYarnBerryLockfile;
+                };
+                const github_spec = first_spec[at_github_idx + "@github:".len ..];
+                var repo = try Repository.parseAppendGithub(github_spec, string_buf);
+
+                if (repo.committish.isEmpty() and resolved.len > 0) {
+                    if (Resolution.fromPnpmLockfile(resolved, string_buf)) |resolved_res| {
+                        if (resolved_res.tag == .github) {
+                            repo.committish = resolved_res.value.github.committish;
+                        }
+                    } else |_| {}
+                }
+
+                if (repo.committish.len() > 0) {
+                    const committish = repo.committish.slice(string_buf.bytes.items);
+                    repo.committish = try appendShortCommit(committish, string_buf);
+                }
+
+                res = .init(.{ .github = repo });
+                const alias_name = first_spec[0..at_github_idx];
+                real_name_hash = String.Builder.stringHash(alias_name);
+                real_name_string = try string_buf.appendWithHash(alias_name, real_name_hash);
+            } else if (is_git_spec) {
+                const at_git_idx = strings.indexOf(first_spec, "@git+") orelse {
+                    return error.InvalidYarnBerryLockfile;
+                };
+                const git_spec = first_spec[at_git_idx + 1 ..];
+
+                if (strings.containsComptime(git_spec, "github.com")) {
+                    const github_com_idx = strings.indexOf(git_spec, "github.com/") orelse {
+                        return error.InvalidYarnBerryLockfile;
+                    };
+                    var path = git_spec[github_com_idx + "github.com/".len ..];
+
+                    if (strings.hasPrefixComptime(path, "git+")) {
+                        path = path["git+".len..];
+                    }
+
+                    var hash_idx: usize = 0;
+                    var slash_idx: usize = 0;
+                    for (path, 0..) |c, i| {
+                        switch (c) {
+                            '/' => slash_idx = i,
+                            '#' => {
+                                hash_idx = i;
+                                break;
+                            },
+                            else => {},
+                        }
+                    }
+
+                    const owner = path[0..slash_idx];
+                    var repo_part = if (hash_idx == 0) path[slash_idx + 1 ..] else path[slash_idx + 1 .. hash_idx];
+
+                    if (strings.hasSuffixComptime(repo_part, ".git")) {
+                        repo_part = repo_part[0 .. repo_part.len - 4];
+                    }
+
+                    var repo_result: Repository = .{
+                        .owner = try string_buf.append(owner),
+                        .repo = try string_buf.append(repo_part),
+                    };
+
+                    if (hash_idx != 0) {
+                        const committish = path[hash_idx + 1 ..];
+                        repo_result.committish = try appendShortCommit(committish, string_buf);
+                    } else if (resolved.len > 0) {
+                        if (strings.indexOfChar(resolved, '#')) |resolved_hash_idx| {
+                            const committish = resolved[resolved_hash_idx + 1 ..];
+                            repo_result.committish = try appendShortCommit(committish, string_buf);
+                        }
+                    }
+
+                    res = .init(.{ .github = repo_result });
+                    const alias_name = first_spec[0..at_git_idx];
+                    real_name_hash = String.Builder.stringHash(alias_name);
+                    real_name_string = try string_buf.appendWithHash(alias_name, real_name_hash);
+                } else {
+                    const repo = try Repository.parseAppendGit(git_spec, string_buf);
+                    res = .init(.{ .git = repo });
+                    const alias_name = first_spec[0..at_git_idx];
+                    real_name_hash = String.Builder.stringHash(alias_name);
+                    real_name_string = try string_buf.appendWithHash(alias_name, real_name_hash);
+                }
+            } else if (is_tarball_url_spec) {
+                const at_http_idx = strings.indexOf(first_spec, "@http") orelse {
+                    return error.InvalidYarnBerryLockfile;
+                };
+                const url_after_at = first_spec[at_http_idx + 1 ..];
+
+                if (strings.indexOf(url_after_at, "/-/")) |dash_slash_idx| {
+                    const before_dash_slash = url_after_at[0..dash_slash_idx];
+                    if (strings.lastIndexOfChar(before_dash_slash, '/')) |last_slash| {
+                        const real_pkg_name_from_url = before_dash_slash[last_slash + 1 ..];
+                        real_name_hash = String.Builder.stringHash(real_pkg_name_from_url);
+                        real_name_string = try string_buf.appendWithHash(real_pkg_name_from_url, real_name_hash);
+                    } else {
+                        const real_pkg_name_from_spec = first_spec[0..at_http_idx];
+                        real_name_hash = String.Builder.stringHash(real_pkg_name_from_spec);
+                        real_name_string = try string_buf.appendWithHash(real_pkg_name_from_spec, real_name_hash);
+                    }
+                } else {
+                    const real_pkg_name_from_spec = first_spec[0..at_http_idx];
+                    real_name_hash = String.Builder.stringHash(real_pkg_name_from_spec);
+                    real_name_string = try string_buf.appendWithHash(real_pkg_name_from_spec, real_name_hash);
+                }
+                const version_str = try string_buf.append(version);
+                const parsed = Semver.Version.parse(version_str.sliced(string_buf.bytes.items));
+
+                if (!parsed.valid or parsed.version.major == null or parsed.version.minor == null or parsed.version.patch == null) {
+                    return error.InvalidYarnBerryLockfile;
+                }
+
+                res = .init(.{ .npm = .{
+                    .version = parsed.version.min(),
+                    .url = try string_buf.append(url_after_at),
+                } });
+            } else if (resolved.len == 0) {
+                if (strings.containsComptime(first_spec, "@file:")) {
+                    const at_file_idx = strings.indexOf(first_spec, "@file:") orelse {
+                        return error.InvalidYarnBerryLockfile;
+                    };
+                    const path = first_spec[at_file_idx + "@file:".len ..];
+                    if (strings.hasSuffixComptime(path, ".tgz") or strings.hasSuffixComptime(path, ".tar.gz")) {
+                        res = .init(.{ .local_tarball = try string_buf.append(path) });
+                    } else {
+                        res = .init(.{ .folder = try string_buf.append(path) });
+                    }
+                } else {
+                    return error.InvalidYarnBerryLockfile;
+                }
+            } else if (isDefaultRegistry(resolved) and
+                (strings.hasPrefixComptime(resolved, "https://") or
+                    strings.hasPrefixComptime(resolved, "http://")))
+            {
+                const version_str = try string_buf.append(version);
+                const parsed = Semver.Version.parse(version_str.sliced(string_buf.bytes.items));
+
+                if (!parsed.valid) {
+                    return error.InvalidYarnBerryLockfile;
+                }
+
+                res = .init(.{ .npm = .{
+                    .version = parsed.version.min(),
+                    .url = .{},
+                } });
+            } else {
+                res = Resolution.fromPnpmLockfile(resolved, string_buf) catch {
+                    return error.InvalidYarnBerryLockfile;
+                };
+
+                switch (res.tag) {
+                    .github => {
+                        var repo = res.value.github;
+                        if (repo.committish.len() > 0) {
+                            const committish = repo.committish.slice(string_buf.bytes.items);
+                            repo.committish = try appendShortCommit(committish, string_buf);
+                            res = .init(.{ .github = repo });
+                        }
+                        const repo_name = repo.repo.slice(string_buf.bytes.items);
+                        real_name_hash = String.Builder.stringHash(repo_name);
+                        real_name_string = repo.repo;
+                    },
+                    .git => {
+                        const repo = res.value.git;
+                        var repo_name = repo.repo.slice(string_buf.bytes.items);
+                        if (strings.hasSuffixComptime(repo_name, ".git")) {
+                            repo_name = repo_name[0 .. repo_name.len - 4];
+                        }
+                        if (strings.lastIndexOfChar(repo_name, '/')) |slash| {
+                            repo_name = repo_name[slash + 1 ..];
+                        }
+                        real_name_hash = String.Builder.stringHash(repo_name);
+                        real_name_string = try string_buf.appendWithHash(repo_name, real_name_hash);
+                    },
+                    else => {},
+                }
+            }
+
+            return .{ res, real_name_string, real_name_hash };
+        }
+
        const FromPnpmLockfileError = OOM || error{InvalidPnpmLockfile};

        pub fn fromPnpmLockfile(res_str: []const u8, string_buf: *String.Buf) FromPnpmLockfileError!Resolution {
@@ -540,6 +906,7 @@ pub fn ResolutionType(comptime SemverIntType: type) type {
 const string = []const u8;

 const std = @import("std");
+const PercentEncoding = @import("../url.zig").PercentEncoding;
 const Repository = @import("./repository.zig").Repository;
 const VersionedURLType = @import("./versioned_url.zig").VersionedURLType;

--- a/src/install/yarn.zig
+++ b/src/install/yarn.zig
--- a/test/cli/install/migration/snapshots/yarn-berry.test.ts.snap
+++ b/test/cli/install/migration/snapshots/yarn-berry.test.ts.snap
@@ -0,0 +1,413 @@
+// Bun Snapshot v1, https://bun.sh/docs/test/snapshots
+
+exports[`Yarn Berry migration simple package with conditions (v8 format) 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-conditions",
+      "dependencies": {
+        "@esbuild/darwin-arm64": "^0.21.5",
+        "fsevents": "^2.3.2",
+      },
+    },
+  },
+  "packages": {
+    "@esbuild/darwin-arm64": ["@esbuild/darwin-arm64@0.21.5", "", { "os": "darwin", "cpu": "arm64" }, "sha512-DwqXqZyuk5AiWWf3UfLiRDJ5EDd49zg6O9wclZ7kUMv2WRFr4HKjXp/5t8JZ11QbQfUS6/cRCKGwYhtNAY88kQ=="],
+
+    "fsevents": ["fsevents@2.3.2", "", { "os": "darwin" }, "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration optional peer dependencies 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-peer-meta",
+      "dependencies": {
+        "react": "^18.0.0",
+      },
+    },
+  },
+  "packages": {
+    "loose-envify": ["loose-envify@1.4.0", "", { "peerDependencies": { "typescript": "*" }, "optionalPeers": ["typescript"], "bin": { "loose-envify": "cli.js" } }, "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q=="],
+
+    "react": ["react@18.2.0", "", { "dependencies": { "loose-envify": "^1.1.0" } }, "sha512-/3IjMdb2L9QbBdWiW5e3P2/npwMBaU9mHCSCUzNln0ZCYbcfTsGbTJrU/kGemdH2IWmB2ioZ+zkxtmq6g09fGQ=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration optional dependencies via dependenciesMeta 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-deps-meta",
+      "dependencies": {
+        "sharp": "^0.32.0",
+      },
+    },
+  },
+  "packages": {
+    "@img/sharp-darwin-arm64": ["@img/sharp-darwin-arm64@0.32.6", "", { "os": "darwin", "cpu": "arm64" }, ""],
+
+    "@img/sharp-linux-x64": ["@img/sharp-linux-x64@0.32.6", "", { "os": "linux", "cpu": "x64" }, ""],
+
+    "sharp": ["sharp@0.32.6", "", { "dependencies": { "@img/sharp-darwin-arm64": "0.32.6", "@img/sharp-linux-x64": "0.32.6" }, "optionalDependencies": { "@img/sharp-darwin-arm64": "0.32.6", "@img/sharp-linux-x64": "0.32.6" } }, "sha512-KyLTWwgcR9Oe4d9HwCwNM2l7+J0dUQwn/yf7S0EnTtb0eVS4RxO0eUSvxPtzT4F3SY+C4K6fqdv/DO27sJ/v/w=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration bin definitions 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-bins",
+      "dependencies": {
+        "typescript": "^5.9.2",
+      },
+    },
+  },
+  "packages": {
+    "typescript": ["typescript@5.9.2", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-CWBzXQrc/qOkhidw1OzBTQuYRbfyxDXJMVJ1XNwUHGROVmuaeiEm3OslpZ1RV96d7SKKjZKrSJu3+t/xlw3R9A=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration workspace:* protocol 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-workspaces",
+      "dependencies": {
+        "lib-a": "workspace:*",
+      },
+    },
+    "packages/lib-a": {
+      "name": "lib-a",
+      "version": "1.0.0",
+    },
+  },
+  "packages": {
+    "lib-a": ["lib-a@workspace:packages/lib-a"],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration v4 format (Yarn 2.x) with bare versions 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-v4",
+      "dependencies": {
+        "lodash": "^4.17.21",
+      },
+    },
+  },
+  "packages": {
+    "lodash": ["lodash@4.17.21", "", {}, "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration v6 format fallback with os/cpu arrays 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "test-v6",
+      "dependencies": {
+        "fsevents": "^2.3.2",
+      },
+    },
+  },
+  "packages": {
+    "fsevents": ["fsevents@2.3.2", "", { "os": "darwin" }, "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration real-world monorepo with Next.js, workspace:^ deps, optional peers, and platform-specific bins 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "nextjs-monorepo",
+      "devDependencies": {
+        "typescript": "^5.0.0",
+      },
+    },
+    "apps/web": {
+      "name": "nextjs-app",
+      "version": "1.0.0",
+      "dependencies": {
+        "@ui/shared": "workspace:^",
+        "next": "14.1.0",
+        "react": "^18.2.0",
+        "react-dom": "^18.2.0",
+      },
+    },
+    "packages/shared": {
+      "name": "@ui/shared",
+      "version": "1.0.0",
+      "dependencies": {
+        "react": "^18.2.0",
+      },
+    },
+  },
+  "packages": {
+    "@next/env": ["@next/env@14.1.0", "", {}, "sha512-Py8zIo+02ht82brwwhTg36iogzFqGLPXlRGKQw5s+qP/kMNc4MAyDeEwBKDijk6zTIbegEgu8Qy7C1LboslQAw=="],
+
+    "@next/swc-darwin-arm64": ["@next/swc-darwin-arm64@14.1.0", "", { "os": "darwin", "cpu": "arm64" }, "sha512-nUDn7TOGcIeyQni6lZHfzNoo9S0euXnu0jhsbMOmMJUBfgsnESdjN97kM7cBqQxZa8L/bM9om/S5/1dzCrW6wQ=="],
+
+    "@next/swc-linux-x64-gnu": ["@next/swc-linux-x64-gnu@14.1.0", "", { "os": "linux", "cpu": "x64" }, "sha512-zJ2pnoFYB1F4vmEVlb/eSe+VH679zT1VdXlZKX+pE66grOgjmKJHKacf82g/sWE4MQ4Rk2FMBCRnX+l6/TVYzQ=="],
+
+    "@ui/shared": ["@ui/shared@workspace:packages/shared"],
+
+    "busboy": ["busboy@1.6.0", "", { "dependencies": { "streamsearch": "^1.1.0" } }, "sha512-8SFQbg/0hQ9xy3UNTB0YEnsNBbWfhf7RtnzpL7TkBiTBRfrQ9Fxcnz7VJsleJpyp6rVLvXiuORqjlHi5q+PYuA=="],
+
+    "client-only": ["client-only@0.0.1", "", {}, "sha512-IV3Ou0jSMzZrd3pZ48nLkT9DA7Ag1pnPzaiQhpW7c3RbcqqzvzzVu+L8gfqMp/8IM2MQtSiqaCxrrcfu8I8rMA=="],
+
+    "js-tokens": ["js-tokens@4.0.0", "", {}, "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="],
+
+    "loose-envify": ["loose-envify@1.4.0", "", { "dependencies": { "js-tokens": "^4.0.0" }, "bin": { "loose-envify": "cli.js" } }, "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q=="],
+
+    "next": ["next@14.1.0", "", { "dependencies": { "@next/env": "14.1.0", "@next/swc-darwin-arm64": "14.1.0", "@next/swc-linux-x64-gnu": "14.1.0", "busboy": "1.6.0", "styled-jsx": "5.1.1" }, "peerDependencies": { "@opentelemetry/api": "^1.1.0", "react": "^18.2.0", "react-dom": "^18.2.0", "sass": "^1.3.0" }, "optionalPeers": ["@opentelemetry/api", "sass"], "bin": { "next": "dist/bin/next" } }, "sha512-wlzrsbfeSU48YQBjZhDzOwhWhGsy+uQycR8bHAOt1LY1bn3zZEcDyHQOEoN3aWzQ8LHCAJ1nqrWCc9XF2+O45Q=="],
+
+    "nextjs-app": ["nextjs-app@workspace:apps/web"],
+
+    "react": ["react@18.2.0", "", { "dependencies": { "loose-envify": "^1.1.0" } }, "sha512-/3IjMdb2L9QbBdWiW5e3P2/npwMBaU9mHCSCUzNln0ZCYbcfTsGbTJrU/kGemdH2IWmB2ioZ+zkxtmq6g09fGQ=="],
+
+    "react-dom": ["react-dom@18.2.0", "", { "dependencies": { "loose-envify": "^1.1.0", "react": "^18.2.0", "scheduler": "^0.23.0" }, "peerDependencies": { "react": "^18.2.0" } }, "sha512-6IMTriUmvsjHUjNtEDudZfuDQUoWXVxKHhlEGSk81n4YFS+r/Kl99wXiwlVXtPBtJenozv2P+hxDsw9eA7Xo6g=="],
+
+    "scheduler": ["scheduler@0.23.0", "", { "dependencies": { "loose-envify": "^1.1.0" } }, "sha512-CtuThmgHNg7zIZWAXi3AsyIzA3n4xx7aNyjwC2VJldO2LMVDhFK+63xGqq6CsJH4rTAt6/M+N4GhZiDYPx9eUw=="],
+
+    "streamsearch": ["streamsearch@1.1.0", "", {}, "sha512-Mcc5wHehp9aXz1ax6bZUyY5afg9u2rv5cqQI3mRrYkGC8rW2hM02jWuwjtL++LS5qinSyhj2QfLyNsuc+VsExg=="],
+
+    "styled-jsx": ["styled-jsx@5.1.1", "", { "dependencies": { "client-only": "0.0.1" }, "peerDependencies": { "react": "*" } }, "sha512-pW7uC1l4mBZ8ugbiZrcIsiIvVx1UmTfw7UkC3Um2tmfUq9Bhk8IiyEIPl6F8agHgjzku6j0xQEZbfA5uSgSaCw=="],
+
+    "typescript": ["typescript@5.3.3", "", { "bin": { "tsc": "bin/tsc", "tsserver": "bin/tsserver" } }, "sha512-pXWcraxM0uxAS+tN0AG/BF2TyqmHO014Z070UsJ+pFvYuRSq8KH8DmWpnbXe0pEPDHXZV3FcAbJkijJ5oNEnWw=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration deeply nested workspace dependencies with multiple conflicting versions 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "complex-deps-monorepo",
+    },
+    "packages/pkg-a": {
+      "name": "pkg-a",
+      "version": "1.0.0",
+      "dependencies": {
+        "lodash": "^4.17.20",
+        "react": "^18.0.0",
+      },
+    },
+    "packages/pkg-b": {
+      "name": "pkg-b",
+      "version": "1.0.0",
+      "dependencies": {
+        "lodash": "^4.17.21",
+        "pkg-a": "workspace:^",
+        "react": "^17.0.0",
+      },
+    },
+    "packages/pkg-c": {
+      "name": "pkg-c",
+      "version": "1.0.0",
+      "dependencies": {
+        "pkg-a": "workspace:^",
+        "pkg-b": "workspace:^",
+        "react": "^18.2.0",
+      },
+    },
+    "packages/pkg-d": {
+      "name": "pkg-d",
+      "version": "1.0.0",
+      "dependencies": {
+        "lodash": "^4.17.19",
+        "pkg-c": "workspace:^",
+        "react": "^16.14.0",
+      },
+    },
+    "packages/pkg-e": {
+      "name": "pkg-e",
+      "version": "1.0.0",
+      "dependencies": {
+        "pkg-a": "workspace:^",
+        "pkg-d": "workspace:^",
+        "react": "^18.0.0",
+      },
+    },
+  },
+  "packages": {
+    "js-tokens": ["js-tokens@4.0.0", "", {}, "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="],
+
+    "lodash": ["lodash@4.17.21", "", {}, "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="],
+
+    "loose-envify": ["loose-envify@1.4.0", "", { "dependencies": { "js-tokens": "^3.0.0 || ^4.0.0" }, "bin": { "loose-envify": "cli.js" } }, "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q=="],
+
+    "object-assign": ["object-assign@4.1.1", "", {}, "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg=="],
+
+    "pkg-a": ["pkg-a@workspace:packages/pkg-a"],
+
+    "pkg-b": ["pkg-b@workspace:packages/pkg-b"],
+
+    "pkg-c": ["pkg-c@workspace:packages/pkg-c"],
+
+    "pkg-d": ["pkg-d@workspace:packages/pkg-d"],
+
+    "pkg-e": ["pkg-e@workspace:packages/pkg-e"],
+
+    "prop-types": ["prop-types@15.8.1", "", { "dependencies": { "loose-envify": "^1.4.0", "object-assign": "^4.1.1", "react-is": "^16.13.1" } }, "sha512-oj87CgZICdulUohogVAR7AjlC0327U4el4L6eAvOqCeudMDVU0NThNaV+b9Df4dXgSP1gXMTnPdhfe/2qDH5cg=="],
+
+    "react": ["react@18.3.1", "", { "dependencies": { "loose-envify": "^1.1.0" } }, "sha512-wS+hAgJShR0KhEvPJArfuPVN1+Hz1t0Y6n5jLrGQbkb4urgPE/0Rve+1kMB1v/oWgHgm4WIcV+i7F2pTVj+2iQ=="],
+
+    "react-is": ["react-is@16.13.1", "", {}, "sha512-24e6ynE2H+OKt4kqsOvNd8kBpV65zoxbA4BVsEOB3ARVWQki/DHzaUoC5KuON/BiccDaCCTZBuOcfZs70kR8bQ=="],
+
+    "pkg-b/react": ["react@17.0.2", "", { "dependencies": { "loose-envify": "^1.1.0", "object-assign": "^4.1.1" } }, "sha512-gnhPt75i/dq/z3/6q/0asP78D0u592D5L1pd7M8P+dck6Fu/jJeL6iVVK23fptSUZj8Vjf++7wXA8UNclGQcbA=="],
+
+    "pkg-d/react": ["react@16.14.0", "", { "dependencies": { "loose-envify": "^1.1.0", "object-assign": "^4.1.1", "prop-types": "^15.6.2" } }, "sha512-0X2CImDkJGApiAlcf0ODKIneSwBPhqJawOa5wCtKbu7ZECrmS26NvtSILynQ66cgkT/RJ4LidJOc3bUESwmU8g=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration git and GitHub dependencies: git-deps-berry 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "git-deps-test",
+      "dependencies": {
+        "git-pkg": "git+https://github.com/example/repo.git#v1.0.0",
+        "github-pkg": "github:user/repo#main",
+      },
+    },
+  },
+  "packages": {
+    "git-pkg": ["git-pkg@github:example/repo#abc123d", {}, "example-repo-abc123d"],
+
+    "github-pkg": ["github-pkg@github:user/repo#deadbee", { "dependencies": { "is-number": "^7.0.0" } }, "user-repo-deadbee"],
+
+    "is-number": ["is-number@7.0.0", "", {}, "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration non-GitHub git dependencies (gitlab, bitbucket): gitlab-deps-berry 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "gitlab-deps-test",
+      "dependencies": {
+        "gitlab-pkg": "git+https://gitlab.com/nickvision/tube.git#v1.0.0",
+      },
+    },
+  },
+  "packages": {
+    "gitlab-pkg": ["gitlab-pkg@git+https://gitlab.com/nickvision/tube.git#abc123def456", {}, "abc123def456"],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration npm aliases in Berry format: npm-aliases-berry 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "npm-alias-test",
+      "dependencies": {
+        "my-lodash": "npm:lodash@^4.17.0",
+        "old-react": "npm:react@17.0.2",
+      },
+    },
+  },
+  "packages": {
+    "js-tokens": ["js-tokens@4.0.0", "", {}, "sha512-RdJUflcE3cUzKiMqQgsCu06FPu9UdIJO0beYbPhHN4k6apgJtifcoCtT9bcxOpYBtpD2kCM6Sbzg4CausW/PKQ=="],
+
+    "loose-envify": ["loose-envify@1.4.0", "", { "dependencies": { "js-tokens": "^4.0.0" }, "bin": { "loose-envify": "cli.js" } }, "sha512-lyuxPGr/Wfhrlem2CL/UcnUc1zcqKAImBDzukY7Y5F/yQiNdko6+fRLevlw1HgMySw7f611UIY408EtxRSoK3Q=="],
+
+    "my-lodash": ["lodash@4.17.21", "", {}, "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="],
+
+    "object-assign": ["object-assign@4.1.1", "", {}, "sha512-rJgTQnkUnH1sFw8yT6VSU3zD3sWmu6sZhIseY8VX+GRu3P6F7Fu+JNDoXfklElbLJSnc3FUQHVe4cU5hj+BcUg=="],
+
+    "old-react": ["react@17.0.2", "", { "dependencies": { "loose-envify": "^1.1.0", "object-assign": "^4.1.1" } }, "sha512-gnhPt75i/dq/z3/6q/0asP78D0u592D5L1pd7M8P+dck6Fu/jJeL6iVVK23fptSUZj8Vjf++7wXA8UNclGQcbA=="],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration custom registry URLs: custom-registry-berry 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "custom-registry-test",
+      "dependencies": {
+        "private-pkg": "^1.0.0",
+      },
+    },
+  },
+  "packages": {
+    "private-pkg": ["private-pkg@1.0.0", "https://my-private-registry.com/private-pkg/-/private-pkg-1.0.0.tgz", {}, ""],
+  }
+}
+"
+`;
+
+exports[`Yarn Berry migration multiple resolutions for same package (version aliasing): multi-resolution-berry 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "multi-res-test",
+      "dependencies": {
+        "is-number": "^7.0.0",
+        "is-odd": "^3.0.0",
+      },
+    },
+  },
+  "packages": {
+    "is-number": ["is-number@7.0.0", "", {}, "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng=="],
+
+    "is-odd": ["is-odd@3.0.1", "", { "dependencies": { "is-number": "^6.0.0" } }, "sha512-CQpnWPrDwmP1+SMHXZhtLtJv90yiyVfluGsX5iNCVkrhQtU3TQHsUWPG9wkdk9Lgd5yNpAg9jQEo90CBaXgWMA=="],
+
+    "is-odd/is-number": ["is-number@6.0.0", "", {}, "sha512-Wu1VHeILBK8KAWJUAiSZQX94GmOE45Rg6/538fKwiloUu21KncEkYGPqob2oSZ5mUT73vLGrHQjKw3KMPwfDzg=="],
+  }
+}
+"
+`;
--- a/test/cli/install/migration/snapshots/yarn-lock-migration.test.ts.snap
+++ b/test/cli/install/migration/snapshots/yarn-lock-migration.test.ts.snap
@@ -228,9 +228,34 @@ exports[`yarn.lock migration basic yarn.lock with workspace dependencies: worksp
        "lodash": "^4.17.21",
      },
    },
+    "packages/a": {
+      "name": "@workspace/a",
+      "version": "1.0.0",
+      "dependencies": {
+        "@workspace/b": "workspace:*",
+        "is-number": "^7.0.0",
+      },
+    },
+    "packages/b": {
+      "name": "@workspace/b",
+      "version": "1.0.0",
+      "dependencies": {
+        "is-odd": "^3.0.1",
+      },
+    },
  },
  "packages": {
+    "@workspace/a": ["@workspace/a@workspace:packages/a"],
+
+    "@workspace/b": ["@workspace/b@workspace:packages/b"],
+
+    "is-number": ["is-number@7.0.0", "", {}, "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng=="],
+
+    "is-odd": ["is-odd@3.0.1", "", { "dependencies": { "is-number": "^6.0.0" } }, "sha512-CQpnWPrDwmP1+SMHXZhtLtJv90yiyVfluGsX5iNCVkrhQtU3TQHsUWPG9wkdk9Lgd5yNpAg9jQEo90CBaXgWMA=="],
+
    "lodash": ["lodash@4.17.21", "", {}, "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="],
+
+    "is-odd/is-number": ["is-number@6.0.0", "", {}, "sha512-Wu1VHeILBK8KAWJUAiSZQX94GmOE45Rg6/538fKwiloUu21KncEkYGPqob2oSZ5mUT73vLGrHQjKw3KMPwfDzg=="],
  }
 }
 "
@@ -272,15 +297,15 @@ exports[`yarn.lock migration basic migration with realistic complex yarn.lock: c
    "": {
      "name": "complex-app",
      "dependencies": {
+        "@babel/core": "^7.20.0",
        "react": "^18.2.0",
        "react-dom": "^18.2.0",
-        "@babel/core": "^7.20.0",
        "webpack": "^5.75.0",
      },
      "devDependencies": {
        "@types/react": "^18.0.0",
-        "typescript": "^4.9.0",
        "eslint": "^8.0.0",
+        "typescript": "^4.9.0",
      },
      "optionalDependencies": {
        "fsevents": "^2.3.2",
@@ -2932,7 +2957,7 @@ exports[`bun pm migrate for existing yarn.lock yarn-cli-repo: yarn-cli-repo 1`]

    "class-utils/define-property/is-descriptor/is-data-descriptor/kind-of": ["kind-of@3.2.2", "", { "dependencies": { "is-buffer": "^1.1.5" } }, "sha1-MeohpzS6ubuw8yRm2JOupR5KPGQ="],

-    "commitizen/inquirer/cli-cursor/restore-cursor/onetime": ["onetime@1.1.0", "http://registry.npmjs.org/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789", {}, "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k="],
+    "commitizen/inquirer/cli-cursor/restore-cursor/onetime": ["onetime@1.1.0", "", {}, "sha1-ofeDj4MUxRbwXs78vEzP4EtO14k="],

    "eslint/inquirer/chalk/supports-color/has-flag": ["has-flag@3.0.0", "", {}, "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="],

@@ -3141,9 +3166,9 @@ exports[`bun pm migrate for existing yarn.lock yarn-stuff: yarn-stuff 1`] = `
  "packages": {
    "abbrev": ["abbrev@1.1.1", "", {}, "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="],

-    "full-git-url": ["abbrev-js@github:isaacs/abbrev-js#3f9802e", {}, ""],
+    "full-git-url": ["full-git-url@github:isaacs/abbrev-js#3f9802e", {}, ""],

-    "ghshort": ["ghshort@3.0.1", "https://codeload.github.com/isaacs/abbrev-js/tar.gz/3f9802e56ff878761a338e43ecacbfed39d2181d", {}, ""],
+    "ghshort": ["ghshort@github:isaacs/abbrev-js#3f9802e", {}, ""],

    "old": ["abbrev@1.0.9", "", {}, "sha512-LEyx4aLEC3x6T0UguF6YILf+ntvmOaWsVfENmIW0E9H09vKlLDGelMjjSm0jkDHALj8A8quZ/HapKNigzwge+Q=="],

@@ -3151,11 +3176,11 @@ exports[`bun pm migrate for existing yarn.lock yarn-stuff: yarn-stuff 1`] = `

    "reg": ["abbrev@1.1.1", "", {}, "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="],

-    "remote": ["abbrev@https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8", {}],
+    "remote": ["abbrev@1.1.1", "", {}, "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="],

    "symlink": ["symlink@file:./abbrev-link-target", {}],

-    "tarball": ["tarball@abbrev-1.1.1.tgz", {}],
+    "tarball": ["tarball@file:abbrev-1.1.1.tgz#f8f2c887ad10bf67f634f005b6987fed3179aac8", {}],
  }
 }
 "
@@ -3183,8 +3208,8 @@ exports[`bun pm migrate for existing yarn.lock yarn.lock with packages that have
    "": {
      "name": "os-cpu-test",
      "dependencies": {
-        "fsevents": "^2.3.2",
        "esbuild": "^0.17.0",
+        "fsevents": "^2.3.2",
      },
    },
  },
@@ -3206,3 +3231,135 @@ exports[`bun pm migrate for existing yarn.lock yarn.lock with packages that have
 }
 "
 `;
+
+exports[`bun pm migrate for existing yarn.lock yarn.lock with custom registry tarball URLs: custom-registry-yarn-migration 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "custom-registry-test",
+      "dependencies": {
+        "another-pkg": "https://packages.example.com/tarballs/another-pkg-2.1.0.tgz",
+        "my-package": "https://my-custom-registry.com/my-package/-/my-package-1.0.0.tgz",
+      },
+    },
+  },
+  "packages": {
+    "another-pkg": ["another-pkg@2.1.0", "https://packages.example.com/tarballs/another-pkg-2.1.0.tgz", {}, "sha512-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=="],
+
+    "my-package": ["my-package@1.0.0", "https://my-custom-registry.com/my-package/-/my-package-1.0.0.tgz", {}, ""],
+  }
+}
+"
+`;
+
+exports[`bun pm migrate for existing yarn.lock all yarn v1 quirks in one test: yarn-comprehensive 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "yarn-quirks-test",
+      "dependencies": {
+        "@babel/core": "^7.20.0",
+        "@prisma/engines": "4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81",
+        "is-number": "^7.0.0",
+        "my-lodash": "npm:lodash@4.17.21",
+      },
+      "devDependencies": {
+        "lodash": "^3.10.0",
+      },
+      "optionalDependencies": {
+        "fsevents": "^2.3.2",
+      },
+    },
+    "packages/app": {
+      "name": "@workspace/app",
+      "version": "1.0.0",
+      "dependencies": {
+        "@workspace/lib": "workspace:*",
+        "is-number": "~7.0.0",
+        "lodash": "^4.17.0",
+      },
+    },
+    "packages/lib": {
+      "name": "@workspace/lib",
+      "version": "1.0.0",
+      "dependencies": {
+        "is-odd": "^3.0.0",
+      },
+    },
+  },
+  "packages": {
+    "@babel/core": ["@babel/core@7.20.12", "", { "dependencies": { "@babel/types": "^7.20.7" } }, "sha512-XsMfHovsUYHFMdrIHkZphTN/2Hzzi78R08NuHfDBehym2VsPDL6Zn/JAD/JQdnRvbSsbQc4mVaU1m6JgtTEElg=="],
+
+    "@babel/types": ["@babel/types@7.20.7", "", {}, "sha512-69OnhBxSSgK0OzTJai4kyPDiKTIe3j+ctaHdIGVbRahTLAT7L3R9oeXHC2aVSuGYt3cVnoAMDmOCgJ2yaiLMvg=="],
+
+    "@prisma/engines": ["@prisma/engines@4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81", "", {}, "sha512-q617EUWfRIDTriWADZ4YiWRZXCa/WuhNgLTVd+HqWLffjMSPzyM5uOWoauX91wvQClSKZU4pzI4JJLQ9Kl62Qg=="],
+
+    "@workspace/app": ["@workspace/app@workspace:packages/app"],
+
+    "@workspace/lib": ["@workspace/lib@workspace:packages/lib"],
+
+    "fsevents": ["fsevents@2.3.2", "", { "os": "darwin" }, "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA=="],
+
+    "is-number": ["is-number@7.0.0", "", {}, "sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng=="],
+
+    "is-odd": ["is-odd@3.0.1", "", { "dependencies": { "is-number": "^6.0.0" } }, "sha512-CQpnWPrDwmP1+SMHXZhtLtJv90yiyVfluGsX5iNCVkrhQtU3TQHsUWPG9wkdk9Lgd5yNpAg9jQEo90CBaXgWMA=="],
+
+    "lodash": ["lodash@3.10.1", "", {}, "sha512-9mDDwqVIma6OZX79ZlDACZl8sBm0TEnkf99zV3iMA4GzkSTbUYwRa7cmPR8CKkkl+OuU/fGTM48FNhQ5GnLsXw=="],
+
+    "my-lodash": ["lodash@4.17.21", "", {}, "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="],
+
+    "@workspace/app/lodash": ["lodash@4.17.21", "", {}, "sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg=="],
+
+    "is-odd/is-number": ["is-number@6.0.0", "", {}, "sha512-Wu1VHeILBK8KAWJUAiSZQX94GmOE45Rg6/538fKwiloUu21KncEkYGPqob2oSZ5mUT73vLGrHQjKw3KMPwfDzg=="],
+  }
+}
+"
+`;
+
+exports[`bun pm migrate for existing yarn.lock parser handles indentation correctly: yarn-indentation 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "indent-test",
+      "dependencies": {
+        "test-pkg": "^1.0.0",
+      },
+    },
+  },
+  "packages": {
+    "dep-a": ["dep-a@1.0.0", "", {}, ""],
+
+    "dep-b": ["dep-b@2.0.0", "", {}, ""],
+
+    "test-pkg": ["test-pkg@1.0.0", "", { "dependencies": { "dep-a": "^1.0.0", "dep-b": "^2.0.0" } }, ""],
+  }
+}
+"
+`;
+
+exports[`bun pm migrate for existing yarn.lock handles optionalDependencies correctly: yarn-optional-deps 1`] = `
+"{
+  "lockfileVersion": 1,
+  "configVersion": 1,
+  "workspaces": {
+    "": {
+      "name": "optional-test",
+      "dependencies": {
+        "pkg-a": "^1.0.0",
+      },
+    },
+  },
+  "packages": {
+    "optional-dep": ["optional-dep@1.0.0", "", {}, "sha512-testopt2AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=="],
+
+    "pkg-a": ["pkg-a@1.0.0", "", { "optionalDependencies": { "optional-dep": "^1.0.0" } }, "sha512-testoptionalAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=="],
+  }
+}
+"
+`;
--- a/test/cli/install/migration/yarn-berry.test.ts
+++ b/test/cli/install/migration/yarn-berry.test.ts
--- a/test/cli/install/migration/yarn-lock-migration.test.ts
+++ b/test/cli/install/migration/yarn-lock-migration.test.ts
@@ -1,11 +1,11 @@
 import { describe, expect, test } from "bun:test";
 import fs from "fs";
-import { bunEnv, bunExe, tempDirWithFiles } from "harness";
+import { bunEnv, bunExe, tempDir } from "harness";
 import { join } from "path";

 describe("yarn.lock migration basic", () => {
  test("simple yarn.lock migration produces correct bun.lock", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-simple", {
+    using dir = tempDir("yarn-migration-simple", {
      "package.json": JSON.stringify(
        {
          name: "simple-test",
@@ -31,7 +31,7 @@ is-number@^7.0.0:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -45,14 +45,14 @@ is-number@^7.0.0:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("simple-yarn-migration");
  });

  test("yarn.lock with packages containing long build tags", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-build-tags", {
+    using dir = tempDir("yarn-migration-build-tags", {
      "package.json": JSON.stringify(
        {
          name: "build-tags-test",
@@ -128,7 +128,7 @@ to-fast-properties@^2.0.0:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -142,9 +142,9 @@ to-fast-properties@^2.0.0:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");

    // Verify that long build tags are preserved correctly
    expect(bunLockContent).toContain("4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81");
@@ -159,7 +159,7 @@ to-fast-properties@^2.0.0:
    // Install should work after migration
    const installResult = await Bun.spawn({
      cmd: [bunExe(), "install"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -171,7 +171,7 @@ to-fast-properties@^2.0.0:
  });

  test("yarn.lock with extremely long build tags (regression test)", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-extreme-build-tags", {
+    using dir = tempDir("yarn-migration-extreme-build-tags", {
      "package.json": JSON.stringify(
        {
          name: "extreme-build-tags-test",
@@ -198,7 +198,7 @@ test-package@1.0.0-alpha.beta.gamma.delta.epsilon.zeta.eta.theta.iota.kappa.lamb
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -208,7 +208,7 @@ test-package@1.0.0-alpha.beta.gamma.delta.epsilon.zeta.eta.theta.iota.kappa.lamb
    const exitCode = await migrateResult.exited;
    expect(exitCode).toBe(0);

-    const bunLockPath = join(tempDir, "bun.lock");
+    const bunLockPath = join(String(dir), "bun.lock");
    expect(fs.existsSync(bunLockPath)).toBe(true);

    const bunLockContent = fs.readFileSync(bunLockPath, "utf8");
@@ -226,7 +226,7 @@ test-package@1.0.0-alpha.beta.gamma.delta.epsilon.zeta.eta.theta.iota.kappa.lamb
  });

  test("complex yarn.lock with multiple dependencies and versions", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-complex", {
+    using dir = tempDir("yarn-migration-complex", {
      "package.json": JSON.stringify(
        {
          name: "complex-test",
@@ -714,7 +714,7 @@ vary@~1.1.2:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -728,14 +728,14 @@ vary@~1.1.2:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("complex-yarn-migration");
  });

  test("yarn.lock with npm aliases", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-aliases", {
+    using dir = tempDir("yarn-migration-aliases", {
      "package.json": JSON.stringify(
        {
          name: "alias-test",
@@ -786,7 +786,7 @@ undici-types@~5.26.4:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -800,9 +800,9 @@ undici-types@~5.26.4:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("aliases-yarn-migration");

    // Verify that npm aliases are handled correctly
@@ -811,7 +811,7 @@ undici-types@~5.26.4:
  });

  test("yarn.lock with resolutions", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-resolutions", {
+    using dir = tempDir("yarn-migration-resolutions", {
      "package.json": JSON.stringify(
        {
          name: "resolutions-test",
@@ -876,7 +876,7 @@ webpack@^5.89.0:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -890,9 +890,9 @@ webpack@^5.89.0:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("resolutions-yarn-migration");

    // Verify resolutions are handled
@@ -900,7 +900,7 @@ webpack@^5.89.0:
  });

  test("yarn.lock with workspace dependencies", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-workspace", {
+    using dir = tempDir("yarn-migration-workspace", {
      "package.json": JSON.stringify(
        {
          name: "workspace-root",
@@ -974,7 +974,7 @@ lodash@^4.17.21:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -988,9 +988,9 @@ lodash@^4.17.21:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("workspace-yarn-migration");

    // TODO: Workspace dependencies are not yet supported in yarn migration
@@ -998,7 +998,7 @@ lodash@^4.17.21:
  });

  test("yarn.lock with scoped packages and parent/child relationships", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-scoped", {
+    using dir = tempDir("yarn-migration-scoped", {
      "package.json": JSON.stringify(
        {
          name: "scoped-test",
@@ -1089,7 +1089,7 @@ babel-loader/chalk@^2.4.2:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -1103,9 +1103,9 @@ babel-loader/chalk@^2.4.2:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("scoped-yarn-migration");

    // Verify scoped packages are at the bottom
@@ -1124,7 +1124,7 @@ babel-loader/chalk@^2.4.2:

  test("migration with realistic complex yarn.lock", async () => {
    // Create a realistic yarn.lock with various edge cases
-    const tempDir = tempDirWithFiles("yarn-migration-complex-realistic", {
+    using dir = tempDir("yarn-migration-complex-realistic", {
      "package.json": JSON.stringify(
        {
          name: "complex-app",
@@ -1314,7 +1314,7 @@ webpack@^5.75.0:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -1323,9 +1323,9 @@ webpack@^5.75.0:

    const exitCode = await migrateResult.exited;
    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("complex-realistic-yarn-migration");

    // Verify key features are migrated
@@ -1352,14 +1352,14 @@ describe("bun pm migrate for existing yarn.lock", () => {
    const packageJsonContent = await Bun.file(join(import.meta.dir, "yarn", folder, "package.json")).text();
    const yarnLockContent = await Bun.file(join(import.meta.dir, "yarn", folder, "yarn.lock")).text();

-    const tempDir = tempDirWithFiles("yarn-lock-migration-", {
+    using dir = tempDir("yarn-lock-migration-", {
      "package.json": packageJsonContent,
      "yarn.lock": yarnLockContent,
    });

    const migrateResult = Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -1367,14 +1367,14 @@ describe("bun pm migrate for existing yarn.lock", () => {
    });

    expect(migrateResult.exited).resolves.toBe(0);
-    expect(Bun.file(join(tempDir, "bun.lock")).exists()).resolves.toBe(true);
+    expect(Bun.file(join(String(dir), "bun.lock")).exists()).resolves.toBe(true);

-    const bunLockContent = await Bun.file(join(tempDir, "bun.lock")).text();
+    const bunLockContent = await Bun.file(join(String(dir), "bun.lock")).text();
    expect(bunLockContent).toMatchSnapshot(folder);
  });

  test("yarn.lock with packages that have os/cpu requirements", async () => {
-    const tempDir = tempDirWithFiles("yarn-migration-os-cpu", {
+    using dir = tempDir("yarn-migration-os-cpu", {
      "package.json": JSON.stringify(
        {
          name: "os-cpu-test",
@@ -1454,7 +1454,7 @@ fsevents@^2.3.2:
    // Run bun pm migrate
    const migrateResult = await Bun.spawn({
      cmd: [bunExe(), "pm", "migrate", "-f"],
-      cwd: tempDir,
+      cwd: String(dir),
      env: bunEnv,
      stdout: "pipe",
      stderr: "pipe",
@@ -1468,9 +1468,9 @@ fsevents@^2.3.2:
    ]);

    expect(exitCode).toBe(0);
-    expect(fs.existsSync(join(tempDir, "bun.lock"))).toBe(true);
+    expect(fs.existsSync(join(String(dir), "bun.lock"))).toBe(true);

-    const bunLockContent = fs.readFileSync(join(tempDir, "bun.lock"), "utf8");
+    const bunLockContent = fs.readFileSync(join(String(dir), "bun.lock"), "utf8");
    expect(bunLockContent).toMatchSnapshot("os-cpu-yarn-migration");

    // Verify that the lockfile contains the expected os/cpu metadata by checking the snapshot
@@ -1479,4 +1479,328 @@ fsevents@^2.3.2:
    expect(bunLockContent).toContain("@esbuild/linux-arm64");
    expect(bunLockContent).toContain("@esbuild/darwin-arm64");
  });
+
+  test("yarn.lock with custom registry tarball URLs", async () => {
+    using dir = tempDir("yarn-migration-custom-registry", {
+      "package.json": JSON.stringify(
+        {
+          name: "custom-registry-test",
+          version: "1.0.0",
+          dependencies: {
+            "my-package": "https://my-custom-registry.com/my-package/-/my-package-1.0.0.tgz",
+            "another-pkg": "https://packages.example.com/tarballs/another-pkg-2.1.0.tgz",
+          },
+        },
+        null,
+        2,
+      ),
+      "yarn.lock": `# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"another-pkg@https://packages.example.com/tarballs/another-pkg-2.1.0.tgz":
+  version "2.1.0"
+  resolved "https://packages.example.com/tarballs/another-pkg-2.1.0.tgz#abc123def456"
+  integrity sha512-AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA=
+
+"my-package@https://my-custom-registry.com/my-package/-/my-package-1.0.0.tgz":
+  version "1.0.0"
+  resolved "https://my-custom-registry.com/my-package/-/my-package-1.0.0.tgz#deadbeef"
+  integrity sha512-BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB=
+`,
+    });
+
+    await using proc = Bun.spawn({
+      cmd: [bunExe(), "pm", "migrate", "-f"],
+      cwd: String(dir),
+      env: bunEnv,
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    expect(stderr).not.toContain("error");
+    expect(exitCode).toBe(0);
+
+    const bunLockContent = await Bun.file(join(String(dir), "bun.lock")).text();
+    expect(bunLockContent).toMatchSnapshot("custom-registry-yarn-migration");
+
+    // Verify custom registry URLs are preserved as tarball resolutions
+    expect(bunLockContent).toContain("my-package");
+    expect(bunLockContent).toContain("another-pkg");
+    expect(bunLockContent).toContain("my-custom-registry.com");
+    expect(bunLockContent).toContain("packages.example.com");
+  });
+
+  test("all yarn v1 quirks in one test", async () => {
+    using dir = tempDir("yarn-comprehensive", {
+      "package.json": JSON.stringify(
+        {
+          name: "yarn-quirks-test",
+          version: "1.0.0",
+          private: true,
+          workspaces: ["packages/*"],
+          dependencies: {
+            // Multi-spec consolidation: multiple ranges -> same version
+            "is-number": "^7.0.0",
+            // npm alias
+            "my-lodash": "npm:lodash@4.17.21",
+            // Scoped package
+            "@babel/core": "^7.20.0",
+            // Long build tag
+            "@prisma/engines": "4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81",
+          },
+          devDependencies: {
+            // Multiple versions of same package
+            lodash: "^3.10.0",
+          },
+          optionalDependencies: {
+            // Platform-specific (but yarn doesn't store os/cpu)
+            fsevents: "^2.3.2",
+          },
+        },
+        null,
+        2,
+      ),
+      "packages/app/package.json": JSON.stringify(
+        {
+          name: "@workspace/app",
+          version: "1.0.0",
+          dependencies: {
+            // Workspace dependency
+            "@workspace/lib": "workspace:*",
+            // Creates multi-spec entry with root
+            "is-number": "~7.0.0",
+            // Different version than root
+            lodash: "^4.17.0",
+          },
+        },
+        null,
+        2,
+      ),
+      "packages/lib/package.json": JSON.stringify(
+        {
+          name: "@workspace/lib",
+          version: "1.0.0",
+          dependencies: {
+            // External dep
+            "is-odd": "^3.0.0",
+          },
+        },
+        null,
+        2,
+      ),
+      "yarn.lock": `# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
+# yarn lockfile v1
+
+
+"@babel/core@^7.20.0":
+  version "7.20.12"
+  resolved "https://registry.yarnpkg.com/@babel/core/-/core-7.20.12.tgz#7f12f7fe01cfcc5c4f37fa6e09a6e7ac0736b5e9"
+  integrity sha512-XsMfHovsUYHFMdrIHkZphTN/2Hzzi78R08NuHfDBehym2VsPDL6Zn/JAD/JQdnRvbSsbQc4mVaU1m6JgtTEElg==
+  dependencies:
+    "@babel/types" "^7.20.7"
+
+"@babel/types@^7.20.7":
+  version "7.20.7"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.20.7.tgz#54ec75e252318423fc07fb644dc6a58a64c09b7f"
+  integrity sha512-69OnhBxSSgK0OzTJai4kyPDiKTIe3j+ctaHdIGVbRahTLAT7L3R9oeXHC2aVSuGYt3cVnoAMDmOCgJ2yaiLMvg==
+
+"@prisma/engines@4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81":
+  version "4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81"
+  resolved "https://registry.yarnpkg.com/@prisma/engines/-/engines-4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81.tgz#5512069ca14c44af7f38e7c39d9a169480e63a33"
+  integrity sha512-q617EUWfRIDTriWADZ4YiWRZXCa/WuhNgLTVd+HqWLffjMSPzyM5uOWoauX91wvQClSKZU4pzI4JJLQ9Kl62Qg==
+
+"@workspace/lib@workspace:*, @workspace/lib@workspace:packages/lib":
+  version "0.0.0-use.local"
+  resolved "file:packages/lib"
+  dependencies:
+    is-odd "^3.0.0"
+
+fsevents@^2.3.2:
+  version "2.3.2"
+  resolved "https://registry.yarnpkg.com/fsevents/-/fsevents-2.3.2.tgz#8a526f78b8fdf4623b709e0b975c52c24c02fd1a"
+  integrity sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==
+
+"is-number@^6.0.0":
+  version "6.0.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-6.0.0.tgz#e6d15ad31fc262887d1846d1c6c84c9b3b0b5982"
+  integrity sha512-Wu1VHeILBK8KAWJUAiSZQX94GmOE45Rg6/538fKwiloUu21KncEkYGPqob2oSZ5mUT73vLGrHQjKw3KMPwfDzg==
+
+"is-number@^7.0.0, is-number@~7.0.0":
+  version "7.0.0"
+  resolved "https://registry.yarnpkg.com/is-number/-/is-number-7.0.0.tgz#7535345b896734d5f80c4d06c50955527a14f12b"
+  integrity sha512-41Cifkg6e8TylSpdtTpeLVMqvSBEVzTttHvERD741+pnZ8ANv0004MRL43QKPDlK9cGvNp6NZWZUBlbGXYxxng==
+
+is-odd@^3.0.0:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/is-odd/-/is-odd-3.0.1.tgz#65101baf63c59f7b5c3a429d0a4e3d8ca7914559"
+  integrity sha512-CQpnWPrDwmP1+SMHXZhtLtJv90yiyVfluGsX5iNCVkrhQtU3TQHsUWPG9wkdk9Lgd5yNpAg9jQEo90CBaXgWMA==
+  dependencies:
+    is-number "^6.0.0"
+
+lodash@^3.10.0:
+  version "3.10.1"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-3.10.1.tgz#5bf45e8e49ba4189e17d482789dfd15bd140b7b6"
+  integrity sha512-9mDDwqVIma6OZX79ZlDACZl8sBm0TEnkf99zV3iMA4GzkSTbUYwRa7cmPR8CKkkl+OuU/fGTM48FNhQ5GnLsXw==
+
+"lodash@^4.17.0, lodash@4.17.21":
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+
+my-lodash@npm:lodash@4.17.21:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+`,
+    });
+
+    await using proc = Bun.spawn({
+      cmd: [bunExe(), "pm", "migrate", "-f"],
+      cwd: String(dir),
+      env: bunEnv,
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    expect(stderr).not.toContain("error");
+    expect(exitCode).toBe(0);
+
+    const bunLockContent = await Bun.file(join(String(dir), "bun.lock")).text();
+    expect(bunLockContent).toMatchSnapshot("yarn-comprehensive");
+
+    // Multi-spec consolidation: both specs resolve to same package
+    expect(bunLockContent).toContain("is-number@7.0.0");
+
+    // npm alias: should create entry for alias pointing to real package
+    expect(bunLockContent).toContain("my-lodash");
+    expect(bunLockContent).toContain("lodash@4.17.21");
+
+    // Multiple versions: both lodash 3 and 4 should exist
+    expect(bunLockContent).toContain("lodash@3.10.1");
+
+    // Long build tag preserved
+    expect(bunLockContent).toContain("4.16.1-1.4bc8b6e1b66cb932731fb1bdbbc550d1e010de81");
+
+    // Scoped packages
+    expect(bunLockContent).toContain("@babel/core");
+    expect(bunLockContent).toContain("@babel/types");
+
+    // Workspace dependencies
+    expect(bunLockContent).toContain("@workspace/app");
+    expect(bunLockContent).toContain("@workspace/lib");
+
+    // Integrity hashes preserved
+    expect(bunLockContent).toMatch(/sha512-/);
+  });
+
+  test("parser handles indentation correctly", async () => {
+    // Test that the parser correctly handles the YAML-like indentation
+    using dir = tempDir("yarn-indentation", {
+      "package.json": JSON.stringify(
+        {
+          name: "indent-test",
+          version: "1.0.0",
+          dependencies: {
+            "test-pkg": "^1.0.0",
+          },
+        },
+        null,
+        2,
+      ),
+      "yarn.lock": `# yarn lockfile v1
+
+test-pkg@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/test-pkg/-/test-pkg-1.0.0.tgz#abc123"
+  integrity sha512-test123==
+  dependencies:
+    dep-a "^1.0.0"
+    dep-b "^2.0.0"
+
+dep-a@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/dep-a/-/dep-a-1.0.0.tgz#def456"
+  integrity sha512-testa==
+
+dep-b@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/dep-b/-/dep-b-2.0.0.tgz#ghi789"
+  integrity sha512-testb==
+`,
+    });
+
+    await using proc = Bun.spawn({
+      cmd: [bunExe(), "pm", "migrate", "-f"],
+      cwd: String(dir),
+      env: bunEnv,
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    expect(stderr).not.toContain("error");
+    expect(exitCode).toBe(0);
+
+    const bunLockContent = await Bun.file(join(String(dir), "bun.lock")).text();
+    expect(bunLockContent).toMatchSnapshot("yarn-indentation");
+    expect(bunLockContent).toContain("test-pkg");
+    expect(bunLockContent).toContain("dep-a");
+    expect(bunLockContent).toContain("dep-b");
+  });
+
+  test("handles optionalDependencies correctly", async () => {
+    using dir = tempDir("yarn-optional", {
+      "package.json": JSON.stringify(
+        {
+          name: "optional-test",
+          version: "1.0.0",
+          dependencies: {
+            "pkg-a": "^1.0.0",
+          },
+        },
+        null,
+        2,
+      ),
+      "yarn.lock": `# yarn lockfile v1
+
+pkg-a@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/pkg-a/-/pkg-a-1.0.0.tgz#abc"
+  integrity sha512-testoptional==
+  optionalDependencies:
+    optional-dep "^1.0.0"
+
+optional-dep@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/optional-dep/-/optional-dep-1.0.0.tgz#def"
+  integrity sha512-testopt2==
+`,
+    });
+
+    await using proc = Bun.spawn({
+      cmd: [bunExe(), "pm", "migrate", "-f"],
+      cwd: String(dir),
+      env: bunEnv,
+      stdout: "pipe",
+      stderr: "pipe",
+    });
+
+    const [stdout, stderr, exitCode] = await Promise.all([proc.stdout.text(), proc.stderr.text(), proc.exited]);
+
+    expect(stderr).not.toContain("error");
+    expect(exitCode).toBe(0);
+
+    const bunLockContent = await Bun.file(join(String(dir), "bun.lock")).text();
+    expect(bunLockContent).toMatchSnapshot("yarn-optional-deps");
+    expect(bunLockContent).toContain("pkg-a");
+    expect(bunLockContent).toContain("optional-dep");
+    // Should have optionalDependencies field in metadata
+    expect(bunLockContent).toMatch(/optionalDependencies/);
+  });
 });