0.1.4 • Published 7 years ago
async6 v0.1.4
Minimalistic, zero dependency, async utilities for ES6, ES2015, node v6. This library assume node v6 or above with ES2015 Promise and generators. It has no dependency.
DEPRECATED: Use native async/await from Node.js >8.x. This was just a stop gap plugin, but now, no good reason to use it unless you have to ben on node.js 6.x.
Promisify
Promisify a function which follow the standard callback(err, result) pattern.
const promisify = require("async6").promisify;
const glob = require('glob');
const pglob = promisify(glob);
// the call back way
glob("**/*.js", options, function (er, files) {
// files is an array of filenames.
})
// the promise way
pglob("**/*.js").then(files => console.log(files));
- Use the default Node v6, es2015 Promise.
- Does not use
bind()
as there are some performance issues.
run
Run a generator function or generator function "instance" (after first call) that supports direct value, promise in yields, and return a ES2015 Promise which result with the return of the generator function.
const run = require("async6").run;
function* mygen(val){
val = val || 0;
var a = yield 12;
var b = yield getB();
var c = yield getPromiseForC(); // can be any promise that have a then function.
return a + b + c;
}
// assuming getB() return 8, and getPromiseForC() will resolve to 10.
run(mygen).then(v => console.log(v)); // 30
run(mygen(10)).then(v => console.log(v)); // 40
Combining promise, yield, generator
const async6 = require("async6");
const promisify = async6.promisify;
const run = async6.run;
const pglob = promisify(require('glob'));
// using generators, promise, and async6.run (see below)
function* listWebFiles(root){
root = root || ""
var jsFiles = yield pglob(root + "**/*.js");
var cssFiles = yield pglob(root + "**/*.css");
return {jsFiles, cssFiles};
}
run(listWebFiles).then(r => console.log(`jsFiles:\n${r.jsFiles} \ncssFiles:\n${r.cssFiles}`));
// or
run(listWebFiles("./dist/")).then(r => console.log(`jsFiles:\n${r.jsFiles} \ncssFiles:\n${r.cssFiles}`));