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metamask-extension/app/scripts/lib/nodeify.js
Whymarrh Whitby 82a0ee27f3
Fix prefer-rest-params issues (#9215)
See [`prefer-rest-params`](https://eslint.org/docs/rules/prefer-rest-params) for more information.

This change enables `prefer-rest-params` and fixes the issues raised by the rule.
2020-08-13 18:05:18 -02:30

39 lines
1.1 KiB
JavaScript

import promiseToCallback from 'promise-to-callback'
const callbackNoop = function (err) {
if (err) {
throw err
}
}
/**
* A generator that returns a function which, when passed a promise, can treat that promise as a node style callback.
* The prime advantage being that callbacks are better for error handling.
*
* @param {Function} fn - The function to handle as a callback
* @param {Object} context - The context in which the fn is to be called, most often a this reference
*
*/
export default function nodeify (fn, context) {
return function (...args) {
const lastArg = args[args.length - 1]
const lastArgIsCallback = typeof lastArg === 'function'
let callback
if (lastArgIsCallback) {
callback = lastArg
args.pop()
} else {
callback = callbackNoop
}
// call the provided function and ensure result is a promise
let result
try {
result = Promise.resolve(fn.apply(context, args))
} catch (err) {
result = Promise.reject(err)
}
// wire up promise resolution to callback
promiseToCallback(result)(callback)
}
}