evnty/build/dispatch-result.cjs.map

Async-first, reactive event handling library for complex event flows in browser and Node.js

{"version":3,"sources":["../src/dispatch-result.ts"],"sourcesContent":["import { Fn, MaybePromise } from './types.js';\nimport { isThenable, noop } from './utils.js';\n\nconst ERR_BRAND = Symbol.for('evnty.ResultError');\n\n/**\n * @internal\n */\nexport interface ResultError<E = unknown> {\n  readonly error: E;\n  readonly [ERR_BRAND]: true;\n}\n\nfunction ResultError<E>(this: ResultError<E>, error: E): void {\n  (this as { error: E }).error = error;\n}\n(ResultError.prototype as { [ERR_BRAND]: true })[ERR_BRAND] = true;\n\n/**\n * @internal\n */\nexport function err<E>(error: E): ResultError<E> {\n  return new (ResultError as unknown as new (error: E) => ResultError<E>)(error);\n}\n\n/**\n * @internal\n */\nexport function isErr(result: unknown): result is ResultError<unknown> {\n  return typeof result === 'object' && result !== null && (result as Record<symbol, boolean>)[ERR_BRAND] === true;\n}\n\n/**\n * @internal\n */\nexport function isOk(result: unknown): boolean {\n  return typeof result !== 'object' || result === null || !(result as Record<symbol, boolean>)[ERR_BRAND];\n}\n\n/**\n * @internal\n */\nexport type DispatchResultItem<T> = MaybePromise<T> | ResultError;\n\n/**\n * @internal\n */\nexport function unwrap<T>(results: DispatchResultItem<T>[]): MaybePromise<T>[] {\n  const len = results.length;\n  const unwrapped = new Array<MaybePromise<T>>(len);\n  for (let i = 0; i < len; i++) {\n    const r = results[i];\n    unwrapped[i] = isErr(r) ? Promise.reject(r.error) : r;\n  }\n  return unwrapped;\n}\n\nasync function resolveMaybePromises<T>(items: MaybePromise<T>[], asyncIndices: number[]): Promise<T[]> {\n  const pending = new Array<PromiseLike<T>>(asyncIndices.length);\n  for (let j = 0; j < asyncIndices.length; j++) {\n    pending[j] = items[asyncIndices[j]] as PromiseLike<T>;\n  }\n  const resolved = await Promise.all(pending);\n  for (let j = 0; j < asyncIndices.length; j++) {\n    items[asyncIndices[j]] = resolved[j];\n  }\n  return items as T[];\n}\n\nfunction resolveAll<T>(results: DispatchResultItem<T>[]): T[] | Promise<T[]> {\n  const len = results.length;\n  if (len === 0) return results as T[];\n\n  let firstError: unknown;\n  let hasError = false;\n  let asyncIndices: number[] | null = null;\n\n  for (let i = 0; i < len; i++) {\n    const r = results[i];\n    if (isErr(r)) {\n      if (!hasError) {\n        hasError = true;\n        firstError = r.error;\n      }\n    } else if (isThenable(r)) {\n      (asyncIndices ??= []).push(i);\n    }\n  }\n\n  if (hasError) {\n    if (asyncIndices !== null) {\n      for (let j = 0; j < asyncIndices.length; j++) {\n        (results[asyncIndices[j]] as PromiseLike<T>).then(noop, noop);\n      }\n    }\n    return Promise.reject(firstError);\n  }\n  if (asyncIndices === null) return results as T[];\n\n  return resolveMaybePromises(results as MaybePromise<T>[], asyncIndices);\n}\n\nfunction settleAll<T>(results: DispatchResultItem<T>[]): PromiseSettledResult<T>[] | Promise<PromiseSettledResult<T>[]> {\n  const len = results.length;\n  if (len === 0) return [] as PromiseSettledResult<T>[];\n\n  let asyncIndices: number[] | null = null;\n  const settled = new Array<MaybePromise<PromiseSettledResult<T>>>(len);\n\n  for (let i = 0; i < len; i++) {\n    const r = results[i];\n    if (isErr(r)) {\n      settled[i] = { status: 'rejected', reason: r.error };\n    } else if (isThenable(r)) {\n      (asyncIndices ??= []).push(i);\n      settled[i] = r.then(\n        (value): PromiseFulfilledResult<T> => ({ status: 'fulfilled', value }),\n        (reason: unknown): PromiseRejectedResult => ({ status: 'rejected', reason }),\n      );\n    } else {\n      settled[i] = { status: 'fulfilled', value: r };\n    }\n  }\n\n  if (asyncIndices === null) return settled as PromiseSettledResult<T>[];\n\n  return resolveMaybePromises(settled, asyncIndices);\n}\n\n/**\n * Wraps an array of values or promises (typically listener results) and provides batch resolution.\n *\n * @template T\n */\nexport class DispatchResult<T> implements PromiseLike<T[]> {\n  #results: DispatchResultItem<T>[];\n\n  readonly [Symbol.toStringTag] = 'DispatchResult';\n\n  constructor(results: DispatchResultItem<T>[]) {\n    this.#results = results;\n  }\n\n  then<TResult1 = T, TResult2 = never>(\n    onfulfilled?: Fn<[T[]], MaybePromise<TResult1>> | null,\n    onrejected?: Fn<[any], MaybePromise<TResult2>> | null,\n  ): PromiseLike<TResult1 | TResult2> {\n    const resolved = this.all();\n    if (resolved instanceof Promise) return resolved.then(onfulfilled, onrejected);\n    return Promise.resolve(resolved).then(onfulfilled, onrejected);\n  }\n\n  /**\n   * Resolves all listener results, rejecting if any promise rejects or any ResultError exists.\n   */\n  all(): T[] | Promise<T[]> {\n    return resolveAll(this.#results);\n  }\n\n  /**\n   * Waits for all listener results to settle, regardless of fulfillment or rejection.\n   */\n  settled(): PromiseSettledResult<T>[] | Promise<PromiseSettledResult<T>[]> {\n    return settleAll(this.#results);\n  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