Lodash chaining without importing the entire library

daisy-chain.js

function chain(value) {
  return {
    /**
     * @param {function|string} func function or function name (in chained value)
     * @param  {...any} args
     */
    fn(func, ...args) {
      if (typeof func === 'string') {
        return chain(value[func](...args));
      }
      return chain(func(value, ...args));
    },
    value,
  };
}

// -- usage --
const { sortBy, keyBy, mapValues } = require('lodash');

const data = [
  { key: 'b', val: 2},
  { key: 'a', val: 1},
];

console.log(
  chain(data)
    .fn(sortBy, 'key')
    .fn(keyBy, 'key')
    .fn(mapValues, ({ val }) => val)
    .value,
);

// can also invoke built-in functions (like array.map) using string function names
console.log(
  chain(data)
    .fn('map', ({ key }) => [key, key])
    .fn(Object.fromEntries)
    .value
);