src/vs/platform/extensionManagement/common/extensionsScannerService.ts/AbstractExtensionsScannerService/getMtime
class AbstractExtensionsScannerService:	private async getMtime(location: URI): Promise<number | undefined> {
		try {
			const stat = await this.fileService.stat(location);
			if (typeof stat.mtime === 'number') {
				return stat.mtime;
			}
		} catch (err) {
			// That's ok...
		}
		return undefined;
	}