microsoft/typescript-go · error · Error

${publishedTypeScriptAliasPackageName} package.json did not

Error message

${publishedTypeScriptAliasPackageName} package.json did not contain platform optionalDependencies.

What it means

Third validation inside getPublishedTypeScriptPackageJson: the alias package.json must contain an `optionalDependencies` object. That object maps platform package names (e.g. @typescript/native-preview-win32-x64) to versions, and getPublishedPlatformPackageLibDir later reads it to know which platform tarballs to fetch. Stock `typescript` from npm has no such field, so this check distinguishes the native-preview alias distribution from a plain typescript install.

Source

Thrown at Herebyfile.mjs:2213

const publishedPlatformPackageLibDirs = new Map();

const getPublishedTypeScriptPackageJson = memoize(() => {
    const candidates = [
        path.join(extensionDir, "node_modules", publishedTypeScriptAliasPackageName, "package.json"),
        path.join(__dirname, "node_modules", publishedTypeScriptAliasPackageName, "package.json"),
    ];

    for (const candidate of candidates) {
        if (fs.existsSync(candidate)) {
            const packageJson = JSON.parse(fs.readFileSync(candidate, "utf8"));
            if (packageJson.name !== "typescript") {
                throw new Error(`${publishedTypeScriptAliasPackageName} should alias the typescript package, but found ${packageJson.name}.`);
            }
            if (!packageJson.version || typeof packageJson.version !== "string") {
                throw new Error(`${publishedTypeScriptAliasPackageName} package.json did not contain a version.`);
            }
            if (!packageJson.optionalDependencies || typeof packageJson.optionalDependencies !== "object") {
                throw new Error(`${publishedTypeScriptAliasPackageName} package.json did not contain platform optionalDependencies.`);
            }
            return packageJson;
        }
    }

    throw new Error(`Could not find ${publishedTypeScriptAliasPackageName}; run npm install first.`);
});

function getPublishedTypeScriptVersion() {
    const version = getPublishedTypeScriptPackageJson().version;
    const expectedVersion = getVersion();
    if (usePublishedPlatformPackagesForVsix && version !== expectedVersion) {
        throw new Error(`usePublishedPlatformPackagesForVsix requires ${publishedTypeScriptAliasPackageName}'s installed version (${version}) to match release version ${expectedVersion}.`);
    }
    return version;
}

function checkPublishedPlatformPackagesForVsix() {

View on GitHub (pinned to 1bcfa18d79)

Solutions

1. Restore the alias spec from the repo's package.json/package-lock.json (the version published alongside the native preview) and re-run `npm install`
2. Verify the reinstalled `_extension/node_modules/@typescript/bundled-typescript/package.json` now lists platform packages under optionalDependencies
3. If you maintain the alias package, ensure its package.json publishes the platform optionalDependencies map

const pj = JSON.parse(fs.readFileSync(aliasPath, "utf8"));
if (pj.optionalDependencies === null || typeof pj.optionalDependencies !== "object" || Array.isArray(pj.optionalDependencies)) {
  throw new Error(`${aliasPath} lacks platform optionalDependencies — wrong alias target, reinstall`);
}

When it happens

Trigger: The alias resolved to a package without platform optionalDependencies — typically plain upstream `typescript` instead of the native-preview distribution, or an old/custom build of the alias published before platform packages existed.

Common situations: Someone changed the alias spec in package.json (or the lockfile) so `@typescript/bundled-typescript` now points at the regular typescript package; installing an alias version published by an older layout of this repo.

Related errors

• ${publishedTypeScriptAliasPackageName} should alias the type
• ${publishedTypeScriptAliasPackageName} package.json did not
• ${publishedTypeScriptAliasPackageName} does not depend on ${
• Published platform package ${npmPackageName}@${version} did
• Found external imports in .d.ts files:\n${importErrors.map(e

AI-assisted analysis of microsoft/typescript-go@1bcfa18d79 (2026-08-16). Data as JSON: /api/errors/2c310b3c60283851. Report an issue: GitHub.