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fix(typescript-vfs): resolve lib dir via getDefaultLibFilePath so re-export wrappers (@typescript/typescript6) work #3646

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fix(typescript-vfs): resolve lib dir via getDefaultLibFilePath so re-export wrappers (@typescript/typescript6) work #3646

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10 changes: 7 additions & 3 deletions packages/typescript-vfs/src/index.ts
100755 → 100644
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Original file line number Diff line number Diff line change
Expand Up @@ -290,14 +290,18 @@ export const createDefaultMapFromNodeModules = (
const path = requirePath()
const fs = requireFS()

// Resolve the lib dir from the compiler, which follows re-export wrappers (e.g. @typescript/typescript6)
// to the real stdlib; require.resolve would point at the wrapper's own lib/, which has no lib.*.d.ts.
const ts = _ts ?? (require("typescript") as typeof import("typescript"))

@jakebailey Jake Bailey (jakebailey) Sep 3, 2026

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Does this break browser uses?

const libDir = tsLibDirectory || path.dirname(ts.getDefaultLibFilePath(_compilerOptions))

const getLib = (name: string) => {
const lib = tsLibDirectory || path.dirname(require.resolve("typescript"))
return fs.readFileSync(path.join(lib, name), "utf8")
return fs.readFileSync(path.join(libDir, name), "utf8")
}

const isDtsFile = (file: string) => /\.d\.([^\.]+\.)?[cm]?ts$/i.test(file)

const libFiles = fs.readdirSync(tsLibDirectory || path.dirname(require.resolve("typescript")))
const libFiles = fs.readdirSync(libDir)
const knownLibFiles = libFiles.filter(f => f.startsWith("lib.") && isDtsFile(f))

const fsMap = new Map<string, string>()
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