mirror of
https://github.com/kremalicious/metamask-extension.git
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ac01c5c89a
* Specify type before parameter name
Various JSDoc `@param` entries were specified as `name {type}` rather
than `{type} name`.
A couple of `@return` entries have been given types as well.
* Use JSDoc optional syntax rather than Closure syntax
* Use @returns rather than @return
* Use consistent built-in type capitalization
Primitive types are lower-case, and Object is upper-case.
* Separate param/return description with a dash
41 lines
1.1 KiB
JavaScript
41 lines
1.1 KiB
JavaScript
import promiseToCallback from 'promise-to-callback'
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const callbackNoop = function (err) {
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if (err) {
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throw err
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}
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}
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/**
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* A generator that returns a function which, when passed a promise, can treat that promise as a node style callback.
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* The prime advantage being that callbacks are better for error handling.
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*
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* @param {Function} fn - The function to handle as a callback
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* @param {Object} context - The context in which the fn is to be called, most often a this reference
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*
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*/
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export default function nodeify (fn, context) {
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return function () {
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// parse arguments
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const args = [].slice.call(arguments)
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const lastArg = args[args.length - 1]
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const lastArgIsCallback = typeof lastArg === 'function'
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let callback
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if (lastArgIsCallback) {
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callback = lastArg
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args.pop()
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} else {
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callback = callbackNoop
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}
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// call the provided function and ensure result is a promise
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let result
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try {
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result = Promise.resolve(fn.apply(context, args))
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} catch (err) {
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result = Promise.reject(err)
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}
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// wire up promise resolution to callback
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promiseToCallback(result)(callback)
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}
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}
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