src/vs/workbench/services/environment/browser/environmentService.ts/BrowserWorkbenchEnvironmentService/extensionEnabledProposedApi
class BrowserWorkbenchEnvironmentService:	get extensionEnabledProposedApi(): string[] | undefined {
		if (!this.extensionHostDebugEnvironment) {
			this.extensionHostDebugEnvironment = this.resolveExtensionHostDebugEnvironment();
		}

		return this.extensionHostDebugEnvironment.extensionEnabledProposedApi;
	}