src/vs/workbench/services/themes/browser/productIconThemeData.ts/ProductIconThemeData/toStorage
class ProductIconThemeData:	toStorage(storageService: IStorageService) {
		const data = JSON.stringify({
			id: this.id,
			label: this.label,
			description: this.description,
			settingsId: this.settingsId,
			styleSheetContent: this.styleSheetContent,
			watch: this.watch,
			extensionData: ExtensionData.toJSONObject(this.extensionData),
		});
		storageService.store(ProductIconThemeData.STORAGE_KEY, data, StorageScope.GLOBAL, StorageTarget.MACHINE);
	}