microsoft/TypeScript · error · Error

\n ' ' was not updated while configuring for a prerelease…

Error message

\n  '${tsFilePath}' was not updated while configuring for a prerelease publish for '${tag}'.\n    Ensure that you have not already run this script; otherwise, erase your changes using 'git checkout -- "${tsFilePath}"'.\n

What it means

updateTsFile regex-replaces the `export const version` line in the TS source. configurePrerelease compares the file before and after; if they're identical the replace didn't apply, meaning either the script already ran (source already at the prerelease version) or the version line shape changed and the regex no longer matches.

Solutions

1. Revert the source file with `git checkout -- "<tsFilePath>"` and re-run the script.
2. Verify the version export still matches `/export const version(?:: string)? = ...`.
3. Confirm you haven't already bumped to the prerelease patch.

Example fix

# before (second run of the script fails)
$ node scripts/configurePrerelease.mjs dev package.json src/compiler/core.ts

# after
$ git checkout -- src/compiler/core.ts
$ node scripts/configurePrerelease.mjs dev package.json src/compiler/core.ts

// Verify the source still matches the pre-prerelease shape before running.
const src = fs.readFileSync(tsFilePath, "utf8");
if (!/export const version(?:: string)? = `\$\{versionMajorMinor\}\.\d(-\w+)?;/.test(src)) {
  throw new Error("Source already at prerelease version or regex drifted; run `git checkout -- " + tsFilePath + "` first.");
}

When it happens

Trigger: Running configurePrerelease twice without reverting the source; the version regex in the source has been edited and no longer matches.

Common situations: Re-running a release script after a partial earlier run; a merge conflict resolution that altered the version export line.

Related errors

• Unexpected tag name ' '.
• patch does not match.
• Failed to update status comment
• failed

AI-assisted analysis of microsoft/TypeScript@b465fdbfe1 (2026-08-12). Data as JSON: /api/errors/4837b4a997c61b42. Report an issue: GitHub.

Appendix: source

Thrown at scripts/configurePrerelease.mjs:54

    // Acquire the version from the package.json file and modify it appropriately.
    const packageJsonFilePath = normalize(args[1]);
    /** @type {PackageJson} */
    const packageJsonValue = JSON.parse(readFileSync(packageJsonFilePath).toString());

    const { majorMinor, patch } = parsePackageJsonVersion(packageJsonValue.version);
    const prereleasePatch = getPrereleasePatch(tag, patch);

    // Acquire and modify the source file that exposes the version string.
    const tsFilePath = normalize(args[2]);
    const tsFileContents = readFileSync(tsFilePath).toString();
    const modifiedTsFileContents = updateTsFile(tsFilePath, tsFileContents, majorMinor, patch, prereleasePatch);

    // Ensure we are actually changing something - the user probably wants to know that the update failed.
    if (tsFileContents === modifiedTsFileContents) {
        let err = `\n  '${tsFilePath}' was not updated while configuring for a prerelease publish for '${tag}'.\n    `;
        err += `Ensure that you have not already run this script; otherwise, erase your changes using 'git checkout -- "${tsFilePath}"'.`;
        throw new Error(err + "\n");
    }

    // Finally write the changes to disk.
    // Modify the package.json structure
    packageJsonValue.version = `${majorMinor}.${prereleasePatch}`;
    writeFileSync(packageJsonFilePath, JSON.stringify(packageJsonValue, undefined, 4));
    writeFileSync(tsFilePath, modifiedTsFileContents);
}

/* eslint-disable no-restricted-syntax */
/**
 * @param {string} tsFilePath
 * @param {string} tsFileContents
 * @param {string} majorMinor
 * @param {string} patch
 * @param {string} nightlyPatch
 * @returns {string}
 */

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