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- /**
- * A utility type for choosing between synchronous and asynchronous return
- * values.
- *
- * This is used as the return value for plugins like {@link CustomFunction},
- * {@link Importer}, and {@link FileImporter} so that TypeScript enforces that
- * asynchronous plugins are only passed to {@link compileAsync} and {@link
- * compileStringAsync}, not {@link compile} or {@link compileString}.
- *
- * @typeParam sync - If this is `'sync'`, this can only be a `T`. If it's
- * `'async'`, this can be either a `T` or a `Promise<T>`.
- *
- * @category Other
- */
- export type PromiseOr<T, sync extends 'sync' | 'async'> = sync extends 'async'
- ? T | Promise<T>
- : T;
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