Chainable

chainable.js

function chainable(obj) {
  const proxy = new Proxy(obj, {
    get(target, prop) {
      return typeof target[prop] === 'function'
        ? (...args) => target[prop](...args) || proxy
        : target[prop]
    },
  })
  return proxy
}

const builder = chainable({
  query: {},

  with(a) {
    this.query.with = a
  },

  where(a) {
    this.query.where = a
  },

  get() {
    return this.query
  },
})

console.log(builder.with('tasks').where({ projectId: 'abc' }).get())