src/vs/platform/extensionManagement/node/extensionManagementService.ts/ExtensionManagementService/getManifest
class ExtensionManagementService:	async getManifest(vsix: URI): Promise<IExtensionManifest> {
		const downloadLocation = await this.downloadVsix(vsix);
		const zipPath = path.resolve(downloadLocation.fsPath);
		return getManifest(zipPath);
	}