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Michaël Zasso 3dc3063275 tools: move eslint from tools to tools/node_modules

This is required because we need to add the babel-eslint dependency
and it has to be able to resolve "eslint".
babel-eslint is required to support future ES features such as async
iterators and import.meta.

Refs: https://github.com/nodejs/node/pull/17755
PR-URL: https://github.com/nodejs/node/pull/17820
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

2018-01-11 09:48:05 +01:00

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Run Async

Utility method to run a function either synchronously or asynchronously using a series of common patterns. This is useful for library author accepting sync or async functions as parameter. runAsync will always run them as an async method, and normalize the multiple signature.

Installation

npm install --save run-async

Usage

Here's a simple example print the function results and three options a user can provide a function.

var runAsync = require('run-async');

var printAfter = function (func) {
  var cb = function (err, returnValue) {
    console.log(returnValue);
  };
  runAsync(func, cb)(/* arguments for func */);
};

Using `this.async`

printAfter(function () {
  var done = this.async();

  setTimeout(function () {
    done(null, 'done running with callback');
  }, 10);
});

Returning a promise

printAfter(function () {
  return new Promise(function (resolve, reject) {
    resolve('done running with promises');
  });
});

Synchronous function

printAfter(function () {
  return 'done running sync function';
});

runAsync.cb

runAsync.cb supports all the function types that runAsync does and additionally a traditional callback as the last argument signature:

var runAsync = require('run-async');

// IMPORTANT: The wrapped function must have a fixed number of parameters.
runAsync.cb(function(a, b, cb) {
  cb(null, a + b);
}, function(err, result) {
  console.log(result)
})(1, 2)

If your version of node support Promises natively (node >= 0.12), runAsync will return a promise. Example: runAsync(func)(arg1, arg2).then(cb)

2.1 KiB Raw Blame History