https://github.com/ziglang/zig/issues/18949

src/Watcher.zig

@@ -5,7 +5,7 @@ pub const max_count = 128;
 pub const Event = WatchEvent;
 pub const Item = WatchItem;
 pub const ItemList = WatchList;
-pub const WatchList = std.MultiArrayList(WatchItem);
+pub const WatchList = bun.MultiArrayList(WatchItem);
 pub const HashType = u32;
 const no_watch_item: WatchItemIndex = std.math.maxInt(WatchItemIndex);
 

src/baby_list.zig

@@ -52,7 +52,13 @@ pub fn BabyList(comptime Type: type) type {
 
         pub fn shrinkAndFree(this: *@This(), allocator: std.mem.Allocator, size: usize) void {
             var list_ = this.listManaged(allocator);
+            const new_len = @min(size, @as(usize, list_.items.len));
+
+            // Workaround terrible zig std.ArrayList shrinkAndFree() behavior
+            list_.items.len = list_.capacity;
             list_.shrinkAndFree(size);
+            list_.items.len = new_len;
+
             this.update(list_);
         }
 

src/bun.js/test/jest.zig

@@ -250,7 +250,7 @@ pub const TestRunner = struct {
         log: logger.Log = logger.Log.initComptime(default_allocator),
         module_scope: *DescribeScope = undefined,
 
-        pub const List = std.MultiArrayList(File);
+        pub const List = bun.MultiArrayList(File);
         pub const ID = u32;
         pub const Map = std.ArrayHashMapUnmanaged(u32, u32, ArrayIdentityContext, false);
     };
@@ -259,7 +259,7 @@ pub const TestRunner = struct {
         status: Status = Status.pending,
 
         pub const ID = u32;
-        pub const List = std.MultiArrayList(Test);
+        pub const List = bun.MultiArrayList(Test);
 
         pub const Status = enum(u3) {
             pending,

src/bundler/bundle_v2.zig

@@ -10269,7 +10269,7 @@ pub const LinkerContext = struct {
         // Concatenate the generated CSS chunks together
         const compile_results = chunk.compile_results_for_chunk;
 
-        var compile_results_for_source_map: std.MultiArrayList(CompileResultForSourceMap) = .{};
+        var compile_results_for_source_map: bun.MultiArrayList(CompileResultForSourceMap) = .{};
         compile_results_for_source_map.setCapacity(worker.allocator, compile_results.len) catch bun.outOfMemory();
 
         const sources: []const Logger.Source = c.parse_graph.input_files.items(.source);
@@ -10558,7 +10558,7 @@ pub const LinkerContext = struct {
         // Concatenate the generated JavaScript chunks together
         var prev_filename_comment: Index.Int = 0;
 
-        var compile_results_for_source_map: std.MultiArrayList(CompileResultForSourceMap) = .{};
+        var compile_results_for_source_map: bun.MultiArrayList(CompileResultForSourceMap) = .{};
         compile_results_for_source_map.setCapacity(worker.allocator, compile_results.len) catch bun.outOfMemory();
 
         const show_comments = c.options.mode == .bundle and
@@ -10773,7 +10773,7 @@ pub const LinkerContext = struct {
         c: *LinkerContext,
         isolated_hash: u64,
         worker: *ThreadPool.Worker,
-        results: std.MultiArrayList(CompileResultForSourceMap),
+        results: bun.MultiArrayList(CompileResultForSourceMap),
         chunk_abs_dir: string,
         can_have_shifts: bool,
     ) !sourcemap.SourceMapPieces {

src/js_ast.zig

@@ -8654,7 +8654,7 @@ pub const ServerComponentBoundary = struct {
     /// speed, but also being able to pull a `[]const Index.Int` of all
     /// boundaries for iteration.
     pub const List = struct {
-        list: std.MultiArrayList(ServerComponentBoundary) = .{},
+        list: bun.MultiArrayList(ServerComponentBoundary) = .{},
         /// Used to facilitate fast lookups into `items` by `.source_index`
         map: Map = .{},
 
@@ -8698,7 +8698,7 @@ pub const ServerComponentBoundary = struct {
         }
 
         pub const Slice = struct {
-            list: std.MultiArrayList(ServerComponentBoundary).Slice,
+            list: bun.MultiArrayList(ServerComponentBoundary).Slice,
             map: Map,
 
             pub fn getIndex(l: *const Slice, real_source_index: Index.Int) ?usize {
@@ -8727,7 +8727,7 @@ pub const ServerComponentBoundary = struct {
         };
 
         pub const Adapter = struct {
-            list: std.MultiArrayList(ServerComponentBoundary).Slice,
+            list: bun.MultiArrayList(ServerComponentBoundary).Slice,
 
             pub fn hash(_: Adapter, key: Index.Int) u32 {
                 return std.hash.uint32(key);

src/options.zig

@@ -1931,7 +1931,7 @@ pub const Env = struct {
         key: string,
         value: string,
     };
-    const List = std.MultiArrayList(Entry);
+    const List = bun.MultiArrayList(Entry);
 
     behavior: Api.DotEnvBehavior = Api.DotEnvBehavior.disable,
     prefix: string = "",

src/resolver/package_json.zig

@@ -1204,7 +1204,7 @@ pub const ExportsMap = struct {
 
             pub const Map = struct {
                 // This is not a std.ArrayHashMap because we also store the key_range which is a little weird
-                pub const List = std.MultiArrayList(MapEntry);
+                pub const List = bun.MultiArrayList(MapEntry);
                 expansion_keys: []MapEntry,
                 list: List,
 

src/resolver/resolver.zig

@@ -399,7 +399,7 @@ pub const PendingResolution = struct {
     string_buf: []u8 = "",
     tag: Tag,
 
-    pub const List = std.MultiArrayList(PendingResolution);
+    pub const List = bun.MultiArrayList(PendingResolution);
 
     pub fn deinitListItems(list_: List, allocator: std.mem.Allocator) void {
         var list = list_;

src/router.zig

@@ -35,7 +35,7 @@ pub const Param = struct {
     name: string,
     value: string,
 
-    pub const List = std.MultiArrayList(Param);
+    pub const List = bun.MultiArrayList(Param);
 };
 
 dir: StoredFileDescriptorType = .zero,
@@ -102,7 +102,7 @@ const RouteIndex = struct {
     public_path: string,
     hash: u32,
 
-    pub const List = std.MultiArrayList(RouteIndex);
+    pub const List = bun.MultiArrayList(RouteIndex);
 };
 
 pub const Routes = struct {
@@ -1553,7 +1553,7 @@ test "Pattern Match" {
 
     const TestList = struct {
         pub fn run(comptime list: anytype) usize {
-            const ParamListType = std.MultiArrayList(Entry);
+            const ParamListType = bun.MultiArrayList(Entry);
             var parameters = ParamListType{};
             var failures: usize = 0;
             inline for (comptime std.meta.fieldNames(@TypeOf(list))) |pattern| {

src/sourcemap/sourcemap.zig

@@ -1324,7 +1324,7 @@ pub const LineOffsetTable = struct {
     byte_offset_to_first_non_ascii: u32 = 0,
     byte_offset_to_start_of_line: u32 = 0,
 
-    pub const List = std.MultiArrayList(LineOffsetTable);
+    pub const List = bun.MultiArrayList(LineOffsetTable);
 
     pub fn findLine(byte_offsets_to_start_of_line: []const u32, loc: Logger.Loc) i32 {
         assert(loc.start > -1); // checked by caller

src/string_mutable.zig

@@ -264,7 +264,7 @@ pub const MutableString = struct {
     }
 
     pub fn toOwnedSliceLength(self: *MutableString, length: usize) string {
-        self.list.shrinkAndFree(self.allocator, length);
+        self.list.items.len = @min(length, self.list.items.len);
         return self.list.toOwnedSlice(self.allocator) catch bun.outOfMemory(); // TODO
     }
 

src/url.zig

@@ -598,7 +598,7 @@ pub const QueryStringMap = struct {
         name_hash: u64,
         value: Api.StringPointer,
 
-        pub const List = std.MultiArrayList(Param);
+        pub const List = bun.MultiArrayList(Param);
     };
 
     pub fn initWithScanner(

src/watcher.zig

@@ -5,7 +5,7 @@ pub const max_count = 128;
 pub const Event = WatchEvent;
 pub const Item = WatchItem;
 pub const ItemList = WatchList;
-pub const WatchList = std.MultiArrayList(WatchItem);
+pub const WatchList = bun.MultiArrayList(WatchItem);
 pub const HashType = u32;
 const no_watch_item: WatchItemIndex = std.math.maxInt(WatchItemIndex);