src/data/composite/wiki-properties/fileExtension.js


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// A file extension! Or the default, if provided when calling this.

import {isFileExtension} from '#validators';

// TODO: Not templateCompositeFrom.

export default function(defaultFileExtension = null) {
  return {
    flags: {update: true, expose: true},
    update: {validate: isFileExtension},
    expose: {transform: (value) => value ?? defaultFileExtension},
  };
}