src/vs/platform/extensionManagement/common/extensionsScannerService.ts/AbstractExtensionsScannerService/scanExtensionsUnderDevelopment
class AbstractExtensionsScannerService:	async scanExtensionsUnderDevelopment(scanOptions: ScanOptions): Promise<IScannedExtension[]> {
		if (this.environmentService.isExtensionDevelopment && this.environmentService.extensionDevelopmentLocationURI) {
			const extensions = (await Promise.all(this.environmentService.extensionDevelopmentLocationURI.filter(extLoc => extLoc.scheme === Schemas.file)
				.map(async extensionDevelopmentLocationURI => this.extensionsScanner.scanOneOrMultipleExtensions((await this.createExtensionScannerInput(extensionDevelopmentLocationURI, ExtensionType.User, true, scanOptions.language))))))
				.flat();
			return this.applyScanOptions(extensions, scanOptions, true);
		}
		return [];
	}