eslint-config-chain-able/node_modules/es5-ext/object/ensure-promise.js

an opinionated ESLint configuration

'use strict';

var safeToString = require('../safe-to-string')
  , isPromise    = require('./is-promise');

module.exports = function (value) {
	if (!isPromise(value)) throw new TypeError(safeToString(value) + " is not a thenable");
	return value;
};