fs.*Sync(), bun wiptest, and More ™ (#106)

* very very wip

* almost ready to fix the errors

* Update identity_context.zig

* Update base.zig

* [bun test] It runs successfully

* Remove unnecessary call

* [Bun.js] Improve JS <> Zig unicode string interop

This fixes longstanding unicode bugs with `console.log` & `fetch`.

I believe @evanwashere reported this first awhile ago

* [Bun.js] Implement `Object.is()` binding and a way to set a timeout for script execution

* Update PLCrashReport.zig

* [Bun.js] Make `console.log` more closely match Node.js and Deno

* [Bun.js] Implement formatting specifier for console.*

* Implement `console.clear()`

* bug fix

* Support console.clear()

* Buffer stderr

* [bun test] Begin implementing Node.js `fs`

* Update darwin_c.zig

* Implement more of `fs`

* `mkdir`, `mkdir` recursive, `mkdtemp`

* `open`, `read` (and pread)

* Move some things into more files

* Implement readdir

* `readFile`, `readLink`, and `realpath`

* `writeFile`, `symlink`, `chown`, `rename`, `stat`, `unlink`, `truncate`

* `lutimes`

* Implement `SystemError` and begin wiring up the `fs` module

* `"fs"` - Most of the arguments / validation

* `fs` - Rest of the arguments / validations

* Begin wiring up the `fs` module

* Fix all the build errors

* support printing typed arrays in console.log

* It...works?

* Support `require("fs")`, `import fs from 'fs';`, `import * as fs from 'fs'`

* Fix a couple bugs

* get rid of the crash reporter for now

* Update fs.exports.js

* [bun.js] slight improvement to startup time

* [bun.js] Improve error message printing

* [Bun.js] Add `Bun.gc()` to run the garbage collector manually and report heap size

* [Bun.js] Add Bun.generateHeapSnapshot to return what JS types are using memory

* [Bun.js] Add `Bun.shrink()` to tell JSC to shrink the VM size

* Improve encoding reader

* [bun.js] Improve callback & microtask performance

* Update node_fs.zig

* Implement `console.assert`

* simple test

* [Bun.js] Prepare for multiple globals/realms to support testing

* Create callbacks-overhead.mjs

* Update http.zig

* [Bun.js] Implement `queueMicrotask`

* Add test for queueMicrotask

* 😪

* [Bun.js] Implement `process.versions`, `process.pid`, `process.ppid`, `process.nextTick`, `process.versions`,

* Implement `process.env.toJSON()`

* [Bun.js] Improve performance of `fs.existsSync`

* 💅

* [Bun.js] Implement `process.chdir(str)` and `process.cwd()`, support up to 4 args in `process.nextTick`

* Make creating Zig::Process lazy

* Split processi nto separte file

* [Bun.js] Node.js Streams - Part 1/?

* [Bun.js] Node.js streams 2/?

* WIP streams

* fix crash

* Reduce allocations in many places

* swap

* Make `bun` start 2ms faster

* Always use an apiLock()

* libBacktrace doesn't really work yet

* Fix crash in the upgrade checker

* Clean up code for importing the runtime when not bundling

* 📷

* Update linker.zig

* 68!

* backtrace

* no, really backtrace

* Fix

* Linux fixes

* Fixes on Linux

* Update mimalloc

* [bun test] Automatically scan for {.test,_test,.spec,_spec}.{jsx,tsx,js,cts,mts,ts,cjs}

src/string_immutable.zig

@@ -363,6 +363,7 @@ pub fn eqlComptimeIgnoreLen(self: string, comptime alt: anytype) bool {
 }
 
 inline fn eqlComptimeCheckLen(a: string, comptime b: anytype, comptime check_len: bool) bool {
+    @setEvalBranchQuota(9999);
     if (comptime check_len) {
         if (comptime b.len == 0) {
             return a.len == 0;
@@ -515,6 +516,10 @@ pub fn eqlUtf16(comptime self: string, other: []const u16) bool {
 }
 
 pub fn toUTF8Alloc(allocator: std.mem.Allocator, js: []const u16) !string {
+    return try toUTF8AllocWithType(allocator, []const u16, js);
+}
+
+pub fn toUTF8AllocWithType(allocator: std.mem.Allocator, comptime Type: type, js: Type) !string {
     var temp: [4]u8 = undefined;
     var list = std.ArrayList(u8).initCapacity(allocator, js.len) catch unreachable;
     var i: usize = 0;
@@ -668,6 +673,44 @@ pub inline fn decodeWTF8RuneTMultibyte(p: *const [4]u8, len: u3, comptime T: typ
     unreachable;
 }
 
+pub fn formatUTF16(slice_: []align(1) const u16, writer: anytype) !void {
+    var slice = slice_;
+    var chunk: [512 + 4]u8 = undefined;
+    var chunk_i: u16 = 0;
+
+    while (slice.len > 0) {
+        if (chunk_i >= chunk.len - 5) {
+            try writer.writeAll(chunk[0..chunk_i]);
+            chunk_i = 0;
+        }
+
+        var cp: u32 = slice[0];
+        slice = slice[1..];
+        if (cp & ~@as(u32, 0x03ff) == 0xd800 and slice.len > 0) {
+            cp = 0x10000 + (((cp & 0x03ff) << 10) | (slice[0] & 0x03ff));
+            slice = slice[1..];
+        }
+
+        chunk_i += @as(
+            u8,
+            @call(
+                .{ .modifier = .always_inline },
+                encodeWTF8RuneT,
+                .{ chunk[chunk_i..][0..4], u32, cp },
+            ),
+        );
+    }
+
+    try writer.writeAll(chunk[0..chunk_i]);
+}
+
+test "print UTF16" {
+    var err = std.io.getStdErr();
+    const utf16 = comptime std.unicode.utf8ToUtf16LeStringLiteral("❌ ✅ opkay ");
+    try formatUTF16(utf16, err.writer());
+    // std.unicode.fmtUtf16le(utf16le: []const u16)
+}
+
 /// Convert potentially ill-formed UTF-8 or UTF-16 bytes to a Unicode Codepoint.
 /// - Invalid codepoints are replaced with `zero` parameter
 /// - Null bytes return 0