Function transformSource

src/utils/entropy_source.ts:167–196

(
  source: Source<TOptions, TValueBefore>,
  transformValue: (value: TValueBefore) => TValueAfter,
)

 * This function is out of Semantic Versioning, i.e. can change unexpectedly. Usage is at your own risk.
 */
export function transformSource<TOptions, TValueBefore, TValueAfter>(
  source: Source<TOptions, TValueBefore>,
  transformValue: (value: TValueBefore) => TValueAfter,
): Source<TOptions, TValueAfter> {
  const transformLoadResult = (loadResult: TValueBefore | (() => MaybePromise<TValueBefore>)) => {
    if (isFinalResultLoaded(loadResult)) {
      return transformValue(loadResult)
    }

    return () => {
      const getResult = loadResult()

      if (isPromise(getResult)) {
        return getResult.then(transformValue)
      }

      return transformValue(getResult)
    }
  }

  return (options) => {
    const loadResult = source(options)

    if (isPromise(loadResult)) {
      return loadResult.then(transformLoadResult)
    }

    return transformLoadResult(loadResult)
  }
}