src/vs/platform/extensionManagement/common/extensionsScannerService.ts/AbstractExtensionsScannerService/scanAllExtensions
class AbstractExtensionsScannerService:	async scanAllExtensions(scanOptions: ScanOptions): Promise<IScannedExtension[]> {
		const [system, user, development] = await Promise.all([
			this.scanSystemExtensions(scanOptions),
			this.scanUserExtensions(scanOptions),
			this.scanExtensionsUnderDevelopment(scanOptions),
		]);
		return this.dedupExtensions([...system, ...user, ...development], await this.getTargetPlatform(), true);
	}