function _resolvePackageVersion()

in common/scripts/install-run.js [218:263]

• 42 lines of code
• 7 McCabe index (conditional complexity)

function _resolvePackageVersion(rushCommonFolder, { name, version }) {
    if (!version) {
        version = '*'; // If no version is specified, use the latest version
    }
    if (version.match(/^[a-zA-Z0-9\-\+\.]+$/)) {
        // If the version contains only characters that we recognize to be used in static version specifiers,
        // pass the version through
        return version;
    }
    else {
        // version resolves to
        try {
            const rushTempFolder = _getRushTempFolder(rushCommonFolder);
            const sourceNpmrcFolder = path.join(rushCommonFolder, 'config', 'rush');
            _syncNpmrc(sourceNpmrcFolder, rushTempFolder);
            const npmPath = getNpmPath();
            // This returns something that looks like:
            //  @microsoft/rush@3.0.0 '3.0.0'
            //  @microsoft/rush@3.0.1 '3.0.1'
            //  ...
            //  @microsoft/rush@3.0.20 '3.0.20'
            //  <blank line>
            const npmVersionSpawnResult = childProcess.spawnSync(npmPath, ['view', `${name}@${version}`, 'version', '--no-update-notifier'], {
                cwd: rushTempFolder,
                stdio: []
            });
            if (npmVersionSpawnResult.status !== 0) {
                throw new Error(`"npm view" returned error code ${npmVersionSpawnResult.status}`);
            }
            const npmViewVersionOutput = npmVersionSpawnResult.stdout.toString();
            const versionLines = npmViewVersionOutput.split('\n').filter((line) => !!line);
            const latestVersion = versionLines[versionLines.length - 1];
            if (!latestVersion) {
                throw new Error('No versions found for the specified version range.');
            }
            const versionMatches = latestVersion.match(/^.+\s\'(.+)\'$/);
            if (!versionMatches) {
                throw new Error(`Invalid npm output ${latestVersion}`);
            }
            return versionMatches[1];
        }
        catch (e) {
            throw new Error(`Unable to resolve version ${version} of package ${name}: ${e}`);
        }
    }
}