yarn-runkit/yarn-runkit.js

var ArrayConcat = Array.prototype.concat;
var fs = require("fs");

function mkdir(path)
{
    return wrap(function (callback)
    {
        return fs.mkdir(path, callback);
    });
}
module.exports.mkdir = mkdir;

module.exports.cd = process.chdir;

function ls(path)
{
    return new Promise(function (resolve, reject)
    {
        fs.readdir(path, function (err, result)
        {
            if (err)
                return reject(err);

            console.log(result.join("\n"));

            resolve(result);
        });
    });
}
module.exports.ls = ls;

function cat(path)
{
    return wrap(function (callback)
    {
        fs.readFile(path, "utf-8", callback);
    });
}
module.exports.cat = cat;

function wrap(aFunction)
{
    return new Promise(function (resolve, reject)
    {
        aFunction(function (err, result)
        {
            if (err)
                return reject(err);
            
            resolve(result);
        });
    });
}

var spawn = require("@runkit/tolmasky/spawn/1.0.0");
var ArraySlice = Array.prototype.slice;
var ArrayConcat = Array.prototype.concat;

function yarn()
{
    
    return spawn("node", ArrayConcat.call([require.resolve("yarn/bin/yarn.js")], ArraySlice.apply(arguments), "--no-progress"), { displayCommand: "yarn", displayArguments: [].concat(arguments) }));
}
module.exports.yarn = yarn;


var childProcess = require("child_process");

function spawnAsync(command, args, opts) {
    if (typeof args === 'undefined') {
        args = [];
    }
    if (typeof opts === 'undefined') {
        opts = {};
    }
    return new Promise(function(resolve, reject){
        var stdoutString = '';
        var stderrString = '';
        //console.log('$ '+command+' '+args.join(' '));
        var child = childProcess.spawn(command, args, opts);
        
        child.stdout.on('data', function(data){
            stdoutString += data.toString();
            console.log(data.toString());
        });
        child.stderr.on('data', function(data){
            stderrString += data.toString();
            console.log(data.toString());
        });
        child.on('close', function(exitCode) {
            //console.log('! '+exitCode+' '+command+' '+args.join(' '));
            var result = {
                command: command,
                args: args,
                opts: opts,
                code: exitCode,
                stdout: stdoutString,
                stderr: stderrString,
            };
            if (exitCode === 0 || opts.ignoreExitCode) {
                if (typeof opts.resolveValue === 'undefined') {
                    resolve(result);
                } else {
                    resolve(opts.resolveValue);
                }
            } else {
                reject(result);
            }
        });
    });
};