Home

Awesome

Rocket pipes

Powerful pipes for TypeScript, that chain Promise and ADT like Maybe or Either from popular FP libraries.

Features

Library support

VanillaMonetPurifyfp-tsRxJS / IxJS
PromiseEitherEitherEitherpipe
MaybeMaybePromise<Either>
ValidationEitherAsync
Promise<Either>MaybeAsync
Promise<Maybe>Promise<Either>
Promise<Validation>Promise<Maybe>
Promise<EitherAsync>
Promise<MaybeAsync>

if you want slim version without libraries support, install slim version npm install rocket-pipes-slim

Examples

Basic
const resp = await p(
  () => 123,
  (n) => n + 1
)();
expect(resp + 1).toEqual(125);
Context (❗ mutable)
const resp = await p(
  () => 123,
  pc((ctx: {n: number}) => n => n + ctx.n),
  n => n + 1
).context({n: 1})();
expect(resp + 1).toEqual(126);
Exit pipeline
const resp = await p(
  () => 123,
  (n) => ep(n + 1),
  (n) => "qwe"
)();
iep(resp) && expect(resp.r + 1).toEqual(125);
Replace pipeline (❗ mutable)
const fn = p(
  () => 123,
  (n) => n + 1
);
const resp = await fn.replace([[0, () => 124]])();
expect(resp + 1).toEqual(126);

fn.replaceUndo();
expect(await fn()).toEqual(125);
AOP beforeAll/afterAll hooks
beforeAll((label, n) => {
  expect(label).toEqual("(n) => n + 1\n(n) => n + 1");
  expect(n).toEqual(123);
});
afterAll((label, n) => {
  expect(label).toEqual("(n) => n + 1\n(n) => n + 1");
  expect(n).toEqual(125);
});
p(
  (n: number) => n + 1,
  (n) => n + 1
)(123);
AOP clear hooks
clearAfterAll();
clearBeforeAll();
Promise basic
const resp = await p(
  () => Promise.resolve(123),
  (n) => n + 1
)();
expect(resp + 1).toEqual(125);
Either right
const resp = await p(
  () => Either.right(123),
  (n) => n + 1
)();
expect(resp + 1).toEqual(125);
Promise can include anything supported
const resp = await p(
  () => Promise.resolve(Either.right(123)),
  (n) => n + 1
)();
expect(resp + 1).toEqual(125);
Either left
const resp = await p(
  () => Either.left(123),
  (_, l) => l + 1
)();
expect(resp + 1).toEqual(125);
Maybe some
const resp = await p(
  () => Maybe.some(123),
  (n) => n + 1
)();
expect(resp + 1).toEqual(125);
Maybe none
const resp = await p(
  () => Maybe.none(),
  (s, n) => s || n
)();
expect(resp).toEqual(void 0);
Validation success
const resp = await p(
  () => Validation.success(123),
  (n) => n + 1
)();
expect(resp + 1).toEqual(125);
Validation fail
const resp = await p(
  () => Validation.fail(123),
  (_, l) => l + 1
)();
expect(resp + 1).toEqual(125);