extensions/typescript-language-features/src/tsServer/versionProvider.electron.ts/DiskTypeScriptVersionProvider/localVersion
class DiskTypeScriptVersionProvider:	public get localVersion(): TypeScriptVersion | undefined {
		const tsdkVersions = this.localTsdkVersions;
		if (tsdkVersions?.length) {
			return tsdkVersions[0];
		}

		const nodeVersions = this.localNodeModulesVersions;
		if (nodeVersions && nodeVersions.length === 1) {
			return nodeVersions[0];
		}
		return undefined;
	}