TypeScriptCompilerDefaultLib

Implementation of Default Core Library for TypeScript Compiler

Building

build.bat                  # x64, release and debug, all three memory models
build.bat release gc       # x64, just that one

For 32-bit Windows, set TSLANG_ARCH=x86 before calling build.bat (it is an environment variable, not a positional argument, the same idiom as TSLANG_TOOLCHAIN):

set TSLANG_ARCH=x86
build.bat

Clear it afterwards - set TSLANG_ARCH= (or Remove-Item Env:TSLANG_ARCH in PowerShell) - since it is a session-wide environment variable, not a one-shot argument: a later plain build.bat or tslang --install-default-lib run in the same shell would otherwise silently build only the x86 tree.

This stages into __build\defaultlib\{lib,dll}\x86\<debug|release>\<gc|rc|none>\, alongside the existing x64 tree. It requires two things already built in the compiler repo:

• the x86 Boehm GC: prepare_3rdParty.bat <debug|release> x86 in TypeScriptCompiler;
• the x86 TypeScriptAsyncRuntime.lib, which the DLL build links: scripts\build_tslang_runtime_<debug|release>_x86.bat in TypeScriptCompiler, which puts it in __build\tslang-runtime\<debug|release>\x86\.

Testing

tests.ps1                          # x64, all four passes: release/debug x compile/jit
$Env:TSLANG_ARCH="x86"; .\tests.ps1 # x86, release/compile and debug/compile only

The JIT is host-only (--emit=jit refuses an x86 target by design), so under TSLANG_ARCH=x86 tests.ps1 prints "jit is host-only; skipped for x86" and runs only the two compile passes, against the x86 tree built above. It compiles with -mtriple=i686-pc-windows-msvc and points --gc-lib-path/--tslang-lib-path at the x64 build trees under TypeScriptCompiler (the compiler appends x86 to each itself), so an x64 value already set in $Env:GC_LIB_PATH/$Env:TSLANG_LIB_PATH for the session can't leak into the x86 build.

Docs

• fetch / Headers / Response — built-in HTTP client

Implemented classes & functions

Globals (src/lib.ts):

• parseInt, parseFloat, isNaN, isFinite
• Boolean
• Number
• BigInt
• Date
• RegExp, MatchResults, MatchIndicesResults
• String (plus the string prototype methods it wraps: at, charAt, charCodeAt, codePointAt, concat, endsWith, includes, indexOf, lastIndexOf, localeCompare, match, matchAll, normalize, padEnd, padStart, repeat, replace, replaceAll, search, slice, split, startsWith, substring, toLocaleLowerCase, toLocaleUpperCase, toLowerCase, toUpperCase, toWellFormed, trim, trimStart, trimEnd)
• Math (static)
• ArrayBuffer
• Headers, Response, fetch — see docs/fetch.md
• console (static): log, warn, error, assert

Generics (src/generics/lib.generics.ts):

• Array<T>, TypedArray<T> (and the typed-array aliases: Int8Array, Uint8Array, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, BigUint64Array, Float32Array, Float64Array)
• Map<K, V>
• Set<V>

Errors (src/core/core.d.ts):

• Error
• RangeError

Not yet implemented: Promise, JSON.parse/JSON.stringify, Symbol (beyond the well-known symbols used internally), WeakMap/WeakSet.