@onrails/result/dist/fluent.cjs.map

Tagged Result / ResultAsync for railway-oriented TypeScript — pure tagged unions, neverthrow-shaped compat shim, FL-friendly

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With fewer arguments it returns `(self) => body(self, ...args)`\n * — the curried, data-last-`self` form used with `pipe`/`flow`.\n *\n * The public type is supplied entirely by the caller: annotate the exported\n * const with the exact overload set and let `F` be inferred from it.\n *\n * @example\n * ```ts\n * export const map: {\n *   <T, U, E>(result: Result<T, E>, fn: (value: T) => U): Result<U, E>;\n *   <T, U>(fn: (value: T) => U): <E>(result: Result<T, E>) => Result<U, E>;\n * } = dual(\n *   2,\n *   <T, U, E>(result: Result<T, E>, fn: (value: T) => U): Result<U, E> =>\n *     isOk(result) ? ok(fn(result.value)) : err(result.error),\n * );\n * ```\n */\nexport const dual = <F>(arity: number, body: (...args: never[]) => unknown): F => {\n  // `(...args: never[]) => unknown` is the top function type, so every typed\n  // body is assignable to the parameter — but it cannot be invoked with\n  // `unknown` arguments. Re-view it through the variadic shape the dispatcher\n  // actually forwards; the constraint is that `body` only ever receives the\n  // arguments the caller's overload annotation admitted.\n  const run = body as (...args: readonly unknown[]) => unknown;\n  const dispatcher = (...args: readonly unknown[]): unknown =>\n    args.length >= arity ? run(...args) : (self: unknown) => run(self, ...args);\n  // The caller's overload annotation on the exported const supplies the real\n  // public type; internally the dispatcher stays `unknown`-typed.\n  return dispatcher as F;\n};\n","import { dual } from \"./internal/dual.js\";\nimport type { Err, Ok, Result } from \"./types.js\";\n\nexport type { Err, Ok, Result } from \"./types.js\";\n\n/**\n * Lifts a value into the success track.\n *\n * @example\n * ```ts\n * const r = ok(42);                          // Result<number, never>\n * const typed: Result<number, \"parse\"> = ok(1);\n * ```\n */\nexport const ok = <T, E = never>(value: T): Result<T, E> => ({\n  _tag: \"Ok\",\n  value,\n});\n\n/**\n * Fantasy Land `pure` — alias of {@link ok}. One lift name shared across the\n * trio (`of` / `Maybe.of` / `ResultAsync.of`) for generic and FL-style code.\n *\n * @example\n * ```ts\n * const r = of(42);   // Result<number, never> — identical to ok(42)\n * ```\n */\nexport const of = ok;\n\n/**\n * Lifts a value into the error track.\n *\n * @example\n * ```ts\n * const r = err({ kind: \"parse\", message: \"bad json\" });\n * // Result<never, { kind: \"parse\"; message: string }>\n * ```\n */\nexport const err = <T = never, E = unknown>(error: E): Result<T, E> => ({\n  _tag: \"Err\",\n  error,\n});\n\n/**\n * Type-narrowing predicate: returns `true` when the result is `Ok`.\n *\n * @example\n * ```ts\n * if (isOk(r)) {\n *   console.log(r.value);    // narrowed to Ok branch\n * }\n * ```\n */\nexport const isOk = <T, E>(result: Result<T, E>): result is Ok<T, E> => result._tag === \"Ok\";\n\n/**\n * Type-narrowing predicate: returns `true` when the result is `Err`.\n *\n * @example\n * ```ts\n * if (isErr(r)) {\n *   metrics.inc(\"error\", { kind: r.error.kind });\n * }\n * ```\n */\nexport const isErr = <T, E>(result: Result<T, E>): result is Err<T, E> => result._tag === \"Err\";\n\n// ─────────────────────────────────────────────────────────────────────────────\n// Dual-form helpers — each export accepts either shape:\n//   data-first: `map(result, fn)`\n//   curried:    `map(fn)(result)`\n// Arity dispatch is derived from the internal `dual` combinator\n// (src/internal/dual.ts); the const annotation carries the public overloads.\n// ─────────────────────────────────────────────────────────────────────────────\n\n/**\n * Transform the `Ok` value, passing `Err` through unchanged. Dual-form:\n * call data-first or curried (for use with {@link pipe}).\n *\n * @example\n * ```ts\n * map(ok(2), (n) => n * 3);          // Ok 6 — data-first\n * pipe(ok(\"x\"), map((s) => s.length));// Ok 1 — curried\n * ```\n */\nexport const map: {\n  <T, U, E>(result: Result<T, E>, fn: (value: T) => U): Result<U, E>;\n  <T, U>(fn: (value: T) => U): <E>(result: Result<T, E>) => Result<U, E>;\n} = dual(\n  2,\n  <T, U, E>(result: Result<T, E>, fn: (value: T) => U): Result<U, E> =>\n    isOk(result) ? ok(fn(result.value)) : err(result.error),\n);\n\n/**\n * Transform the `Err` value, passing `Ok` through unchanged. Useful for\n * unifying heterogeneous failure types into one app-level union.\n *\n * @example\n * ```ts\n * type AppError = { kind: \"http\"; status: number } | { kind: \"parse\" };\n * pipe(\n *   fetchSync(url),                                     // Result<Body, { status: number }>\n *   mapErr((e): AppError => ({ kind: \"http\", status: e.status })),\n * );\n * ```\n */\nexport const mapErr: {\n  <T, E, F>(result: Result<T, E>, fn: (error: E) => F): Result<T, F>;\n  <E, F>(fn: (error: E) => F): <T>(result: Result<T, E>) => Result<T, F>;\n} = dual(\n  2,\n  <T, E, F>(result: Result<T, E>, fn: (error: E) => F): Result<T, F> =>\n    isErr(result) ? err(fn(result.error)) : ok(result.value),\n);\n\n/**\n * Transform both tracks at once — `Ok` via `onOk`, `Err` via `onErr`.\n * Equivalent to `mapErr(onErr)(map(onOk)(result))` but in one pass.\n *\n * @example\n * ```ts\n * bimap(parsed, (cfg) => cfg.name, (e) => ({ kind: \"input\", cause: e }));\n * ```\n */\nexport const bimap: {\n  <T, U, E, F>(result: Result<T, E>, onOk: (value: T) => U, onErr: (error: E) => F): Result<U, F>;\n  <T, U, E, F>(\n    onOk: (value: T) => U,\n    onErr: (error: E) => F,\n  ): (result: Result<T, E>) => Result<U, F>;\n} = dual(\n  3,\n  <T, U, E, F>(\n    result: Result<T, E>,\n    onOk: (value: T) => U,\n    onErr: (error: E) => F,\n  ): Result<U, F> => (isOk(result) ? ok(onOk(result.value)) : err(onErr(result.error))),\n);\n\n/**\n * Canonical bind (Fantasy Land `chain`). Chains a Result-returning step,\n * widening the error union to `E | F`. Short-circuits on `Err`.\n *\n * @example\n * ```ts\n * flatMap(parseInput(raw), (data) =>\n *   data.id != null ? ok(data) : err({ kind: \"missing_id\" as const }),\n * );\n * // Result<Data, ParseError | { kind: \"missing_id\" }>\n * ```\n */\nexport const flatMap: {\n  <T, U, E, F>(result: Result<T, E>, fn: (value: T) => Result<U, F>): Result<U, E | F>;\n  <T, U, F>(fn: (value: T) => Result<U, F>): <E>(result: Result<T, E>) => Result<U, E | F>;\n} = dual(\n  2,\n  <T, U, E, F>(result: Result<T, E>, fn: (value: T) => Result<U, F>): Result<U, E | F> =>\n    isOk(result) ? fn(result.value) : err(result.error),\n);\n\n/**\n * Error-track bind — runs `fn` only when the result is `Err`, allowing\n * a failed workflow to recover to `Ok` or remap the failure. Mirror of\n * {@link flatMap} on the error channel.\n *\n * @example\n * ```ts\n * recover(networkResult, (e) =>\n *   e.kind === \"rate_limit\" ? ok(cachedBody) : err(e),\n * );\n * ```\n */\nexport const recover: {\n  <T, E, F>(result: Result<T, E>, fn: (error: E) => Result<T, F>): Result<T, F>;\n  <T, E, F>(fn: (error: E) => Result<T, F>): (result: Result<T, E>) => Result<T, F>;\n} = dual(\n  2,\n  <T, E, F>(result: Result<T, E>, fn: (error: E) => Result<T, F>): Result<T, F> =>\n    isErr(result) ? fn(result.error) : ok(result.value),\n);\n\n/**\n * Observe the `Ok` value for side effects (logging, metrics) without\n * changing the carried value. Passes `Err` through untouched.\n *\n * @example\n * ```ts\n * pipe(\n *   parseConfig(raw),\n *   tap((cfg) => log.info({ msg: \"parsed\", name: cfg.name })),\n *   flatMap(validate),\n * );\n * ```\n */\nexport const tap: {\n  <T, E>(result: Result<T, E>, fn: (value: T) => void): Result<T, E>;\n  <T>(fn: (value: T) => void): <E>(result: Result<T, E>) => Result<T, E>;\n} = dual(2, <T, E>(result: Result<T, E>, fn: (value: T) => void): Result<T, E> => {\n  if (isOk(result)) fn(result.value);\n  return result;\n});\n\n/**\n * Observe the `Err` value for side effects (logging, metrics) without\n * changing the carried error. Passes `Ok` through untouched.\n *\n * @example\n * ```ts\n * pipe(\n *   loadUser(id),\n *   tapErr((e) => metrics.inc(\"user.load.fail\", { kind: e.kind })),\n * );\n * ```\n */\nexport const tapErr: {\n  <T, E>(result: Result<T, E>, fn: (error: E) => void): Result<T, E>;\n  <E>(fn: (error: E) => void): <T>(result: Result<T, E>) => Result<T, E>;\n} = dual(2, <T, E>(result: Result<T, E>, fn: (error: E) => void): Result<T, E> => {\n  if (isErr(result)) fn(result.error);\n  return result;\n});\n\n/**\n * Terminal collapse — fold both tracks into a single value. Dual-form:\n * 3-args data-first, 2-args curried for {@link pipe}. Returns whatever\n * the handlers return.\n *\n * For files that also import `match` from `ts-pattern`, use a namespace\n * import (`import * as R from \"@onrails/result\"` → `R.match`) to dissolve\n * the collision.\n *\n * @example\n * ```ts\n * const html = match(parsed, (cfg) => render(cfg), (e) => renderError(e));\n * ```\n */\nexport const match: {\n  <T, E, U>(result: Result<T, E>, onOk: (value: T) => U, onErr: (error: E) => U): U;\n  <T, E, U>(onOk: (value: T) => U, onErr: (error: E) => U): (result: Result<T, E>) => U;\n} = dual(\n  3,\n  <T, E, U>(result: Result<T, E>, onOk: (value: T) => U, onErr: (error: E) => U): U =>\n    isOk(result) ? onOk(result.value) : onErr(result.error),\n);\n\n/**\n * Returns the `Ok` value, or `defaultValue` when the result is `Err`.\n *\n * @example\n * ```ts\n * unwrapOr(parsedSetting, \"default-value\");\n * ```\n */\nexport const unwrapOr: {\n  <T, E>(result: Result<T, E>, defaultValue: T): T;\n  <T>(defaultValue: T): <E>(result: Result<T, E>) => T;\n} = dual(\n  2,\n  <T, E>(result: Result<T, E>, defaultValue: T): T => (isOk(result) ? result.value : defaultValue),\n);\n\n/**\n * Test/assert helper — returns the `Ok` value, or **throws the original `Err`\n * value** when called on an `Err`. This is the assertion tier (RFC 0001 §4):\n * intended for `*.spec.ts` / `*.test.ts`, where throwing fails the test loudly.\n * In business logic prefer {@link match} or {@link unwrapOr}; the lint plugins\n * flag `unwrapOk` outside test files.\n *\n * @returns the unwrapped `Ok` value\n * @throws the carried `Err` value when the result is `Err`\n *\n * @example\n * ```ts\n * // in a *.spec.ts\n * expect(unwrapOk(ok(5))).toBe(5);\n * expect(() => unwrapOk(err(error))).toThrow(error);\n * ```\n */\nexport function unwrapOk<T, E>(result: Result<T, E>): T {\n  if (isErr(result)) throw result.error;\n  return result.value;\n}\n\n/** Alias of {@link unwrapOk} for syntax cohesion with `@onrails/maybe`. */\nexport const unwrap = unwrapOk;\n\n/**\n * Test/assert helper — returns the `Err` value, or **throws a `TypeError`**\n * when called on an `Ok`. Mirror of {@link unwrapOk} on the error track and\n * part of the same assertion tier (RFC 0001 §4): intended for `*.spec.ts` /\n * `*.test.ts`. Prefer {@link match} / {@link unwrapOr} in business logic; the\n * lint plugins flag `unwrapErr` outside test files.\n *\n * @returns the unwrapped `Err` value\n * @throws `TypeError` when the result is `Ok`\n *\n * @example\n * ```ts\n * // in a *.spec.ts\n * expect(unwrapErr(err(\"x\"))).toBe(\"x\");\n * expect(() => unwrapErr(ok(5))).toThrow(TypeError);\n * ```\n */\nexport function unwrapErr<T, E>(result: Result<T, E>): E {\n  if (isOk(result)) throw new TypeError(\"unwrapErr called on Ok\");\n  return result.error;\n}\n\n/**\n * Wraps a throwing sync function, returning a function that produces a\n * {@link Result} instead of throwing. Thrown errors pass through `onThrow` to\n * become a typed `Err`; a normal return becomes `Ok`. The neverthrow analogue\n * is `Result.fromThrowable`.\n *\n * @param fn - the throwing function to wrap\n * @param onThrow - maps a thrown value to the `Err` channel\n * @returns a function with `fn`'s parameters that returns `Result<ReturnType, E>`\n *\n * @example\n * ```ts\n * type ParseError = { kind: \"parse\"; message: string };\n * const parse = trySync(\n *   JSON.parse,\n *   (e): ParseError => ({ kind: \"parse\", message: String(e) }),\n * );\n * parse(\"{}\");      // Ok({})\n * parse(\"nope\");    // Err({ kind: \"parse\", … })\n * ```\n */\nexport function trySync<A extends readonly unknown[], T, E>(\n  fn: (...args: A) => T,\n  onThrow: (error: unknown) => E,\n): (...args: A) => Result<T, E>;\nexport function trySync<F extends (...args: never) => unknown, E>(\n  fn: F,\n  onThrow: (error: unknown) => E,\n): (...args: Parameters<F>) => Result<ReturnType<F>, E>;\nexport function trySync(\n  fn: (...args: never) => unknown,\n  onThrow: (error: unknown) => unknown,\n): (...args: never) => Result<unknown, unknown> {\n  return (...args: never) => {\n    try {\n      return ok(fn(...args));\n    } catch (error) {\n      return err(onThrow(error));\n    }\n  };\n}\n\n/**\n * Variadic value-first pipe — threads `value` through up to nine unary fns,\n * left-to-right. Use {@link pipe} when you already have a starting value;\n * use {@link flow} to define a reusable composed function with no value yet.\n *\n * @example\n * ```ts\n * pipe(\n *   parseConfig(raw),\n *   map((cfg) => cfg.name),\n *   flatMap((name) => (name ? ok(name) : err({ kind: \"empty\" as const }))),\n *   tap(log),\n * );\n * ```\n */\nexport function pipe<A>(value: A): A;\nexport function pipe<A, B>(value: A, ab: (a: A) => B): B;\nexport function pipe<A, B, C>(value: A, ab: (a: A) => B, bc: (b: B) => C): C;\nexport function pipe<A, B, C, D>(value: A, ab: (a: A) => B, bc: (b: B) => C, cd: (c: C) => D): D;\nexport function pipe<A, B, C, D, E>(\n  value: A,\n  ab: (a: A) => B,\n  bc: (b: B) => C,\n  cd: (c: C) => D,\n  de: (d: D) => E,\n): E;\nexport function pipe<A, B, C, D, E, F>(\n  value: A,\n  ab: (a: A) => B,\n  bc: (b: B) => C,\n  cd: (c: C) => D,\n  de: (d: D) => E,\n  ef: (e: E) => F,\n): F;\nexport function pipe<A, B, C, D, E, F, G>(\n  value: A,\n  ab: (a: A) => B,\n  bc: (b: B) => C,\n  cd: (c: C) => D,\n  de: (d: D) => E,\n  ef: (e: E) => F,\n  fg: (f: F) => G,\n): G;\nexport function pipe<A, B, C, D, E, F, G, H>(\n  value: A,\n  ab: (a: A) => B,\n  bc: (b: B) => C,\n  cd: (c: C) => D,\n  de: (d: D) => E,\n  ef: (e: E) => F,\n  fg: (f: F) => G,\n  gh: (g: G) => H,\n): H;\nexport function pipe<A, B, C, D, E, F, G, H, I>(\n  value: A,\n  ab: (a: A) => B,\n  bc: (b: B) => C,\n  cd: (c: C) => D,\n  de: (d: D) => E,\n  ef: (e: E) => F,\n  fg: (f: F) => G,\n  gh: (g: G) => H,\n  hi: (h: H) => I,\n): I;\nexport function pipe(value: unknown, ...fns: ReadonlyArray<(x: unknown) => unknown>): unknown {\n  let acc = value;\n  for (const fn of fns) {\n    acc = fn(acc);\n  }\n  return acc;\n}\n\nconst printPayload = (payload: unknown): string => {\n  try {\n    return JSON.stringify(payload) ?? String(payload);\n  } catch {\n    // cyclic or non-JSON payload — a debug printer must not throw\n    return String(payload);\n  }\n};\n\n/**\n * Debug printer — renders a result as `Ok(…)` / `Err(…)` for logs. Payloads\n * print as JSON (values are plain data by design); non-JSON payloads fall\n * back to `String(...)`.\n *\n * @example\n * ```ts\n * show(ok(1));               // 'Ok(1)'\n * show(err({ kind: \"e\" })); // 'Err({\"kind\":\"e\"})'\n * ```\n */\nexport const show = <T, E>(result: Result<T, E>): string =>\n  isOk(result) ? `Ok(${printPayload(result.value)})` : `Err(${printPayload(result.error)})`;\n","import {\n  bimap,\n  flatMap,\n  map,\n  mapErr,\n  match,\n  recover,\n  show,\n  tap,\n  tapErr,\n  unwrapOr,\n} from \"./result.js\";\nimport type { Result } from \"./types.js\";\n\n/** Opt-in dot chaining over a sync {@link Result} */\nexport type FluentResult<T, E> = {\n  readonly result: Result<T, E>;\n  map: <U>(fn: (value: T) => U) => FluentResult<U, E>;\n  mapErr: <F>(fn: (error: E) => F) => FluentResult<T, F>;\n  bimap: <U, F>(onOk: (value: T) => U, onErr: (error: E) => F) => FluentResult<U, F>;\n  flatMap: <U, F = E>(fn: (value: T) => Result<U, F>) => FluentResult<U, E | F>;\n  andThen: <U, F = E>(fn: (value: T) => Result<U, F>) => FluentResult<U, E | F>;\n  recover: <F>(fn: (error: E) => Result<T, F>) => FluentResult<T, F>;\n  tap: (fn: (value: T) => void) => FluentResult<T, E>;\n  tapErr: (fn: (error: E) => void) => FluentResult<T, E>;\n\n  match: <U>(onOk: (value: T) => U, onErr: (error: E) => U) => U;\n  unwrapOr: (defaultValue: T) => T;\n  /** Exit the wrapper — hand back the canonical plain-data result. */\n  toResult: () => Result<T, E>;\n  /** Debug terminal — `Ok(…)` / `Err(…)`, same output as {@link show}. */\n  toString: () => string;\n};\n\n/**\n * Wrap a {@link Result} for opt-in dot chaining — app-edge sugar. Keep the\n * data-first helpers ({@link map}, {@link flatMap}) in library internals.\n *\n * Mirrors every core transform; `test/parity.spec.ts` enforces the mirror.\n *\n * @example\n * ```ts\n * fluent(ok(2)).map((n) => n * 3).unwrapOr(0); // 6\n * ```\n */\nexport const fluent = <T, E>(result: Result<T, E>): FluentResult<T, E> => ({\n  result,\n  map: (fn) => fluent(map(result, fn)),\n  mapErr: (fn) => fluent(mapErr(result, fn)),\n  bimap: (onOk, onErr) => fluent(bimap(result, onOk, onErr)),\n  flatMap: (fn) => fluent(flatMap(result, fn)),\n  andThen: (fn) => fluent(flatMap(result, fn)),\n  recover: (fn) => fluent(recover(result, fn)),\n  tap: (fn) => fluent(tap(result, fn)),\n  tapErr: (fn) => fluent(tapErr(result, fn)),\n\n  match: (onOk, onErr) => match(result, onOk, onErr),\n  unwrapOr: (defaultValue) => unwrapOr(result, defaultValue),\n  toResult: () => result,\n  toString: () => show(result),\n});\n"]}