extensions/typescript-language-features/src/tsServer/versionProvider.electron.ts/DiskTypeScriptVersionProvider/localVersions
class DiskTypeScriptVersionProvider:	public get localVersions(): TypeScriptVersion[] {
		const allVersions = this.localTsdkVersions.concat(this.localNodeModulesVersions);
		const paths = new Set<string>();
		return allVersions.filter(x => {
			if (paths.has(x.path)) {
				return false;
			}
			paths.add(x.path);
			return true;
		});
	}