Compose-ts NPM

compose-ts

compose-ts is a TypeScript library that simplifies function composition, transforming nested calls into a manageable sequence.

Installation

Install via npm or yarn:

npm install compose-ts
# or
yarn add compose-ts

Usage

Import compose from compose-ts and use it to chain functions together.

Basic Example

import { compose } from 'compose-ts';

const add = (n: number, num = 1) => n + num;
const multiply = (n: number, num = 2) => n * num;
const toString = (n: number) => n.toString();

const num = compose(42)(add)(multiply)(add, 5)(toString)();
// Equivalent: const num = toString(add(multiply(add(42)), 5));

console.log(num); // "91"

Advanced Example with Function Enhancers

import { compose } from 'compose-ts';

type Func<TParameters extends any[], TReturnType> =
  (...args: TParameters) => TReturnType;

const addH =
  <TParameters extends any[]>(func: Func<TParameters, number>, num = 1) =>
    (...args: TParameters) => func(...args) + num;

const multiplyH =
  <TParameters extends any[]>(func: Func<TParameters, number>, num = 2) =>
    (...args: TParameters) => func(...args) * num;

const parseIntH =
  (func: Func<[number], number>) =>
    (arg: string) => func(parseInt(arg));

const I = (result: number) => result;

const enhanced = compose(I)(addH)(multiplyH)(addH, 5)(parseIntH)();
// Equivalent: const enhanced = parseIntH(addH(multiplyH(addH(I)), 5));

console.log(enhanced("42")); // 91