src/vs/platform/extensionManagement/common/extensionsScannerService.ts/AbstractExtensionsScannerService/scanMetadata
class AbstractExtensionsScannerService:	async scanMetadata(extensionLocation: URI): Promise<Metadata | undefined> {
		const manifestLocation = joinPath(extensionLocation, 'package.json');
		const content = (await this.fileService.readFile(manifestLocation)).value.toString();
		const manifest: IScannedExtensionManifest = JSON.parse(content);
		return manifest.__metadata;
	}