src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/ExtensionsWorkbenchService/installed
class ExtensionsWorkbenchService:	get installed(): IExtension[] {
		const result = [];
		if (this.localExtensions) {
			result.push(...this.localExtensions.local);
		}
		if (this.remoteExtensions) {
			result.push(...this.remoteExtensions.local);
		}
		if (this.webExtensions) {
			result.push(...this.webExtensions.local);
		}
		return result;
	}