src/vs/workbench/services/extensions/common/abstractExtensionService.ts/AbstractExtensionService/getExtension
class AbstractExtensionService:	public getExtension(id: string): Promise<IExtensionDescription | undefined> {
		return this._installedExtensionsReady.wait().then(() => {
			return this._registry.getExtensionDescription(id);
		});
	}