bottender-compose/lib/branch.js

An utility library for bottender and higher-order handlers

"use strict";

const curry = require('lodash/curry');

const {
  withProps
} = require('bottender');

function Noop() {}

const branch = (predicate, OnTrue, OnFalse = Noop) => {
  const Fn = async (context, props) => {
    if (await predicate(context, props)) {
      return withProps(OnTrue, props);
    }

    return withProps(OnFalse, props);
  };

  const name = `Branch(${OnTrue.name || 'Anonymous'}, ${OnFalse.name || 'Anonymous'})`;
  Object.defineProperty(Fn, 'name', {
    value: name
  });
  return Fn;
};

module.exports = curry(branch);