I have been testing TypeScript with node, all was going well until i tried splitting these out.
Am I forced to use modules ?
I have 2 files, app.ts which has a reference path to the hellofile.tst
/// <reference path="hellofile.ts" />
var testme = new Hello()
console.log(testme.testMe());
and the hellofile.ts which contains
class Hello {
testMe():string {
return "hello";
}
}
Now running the program (i am using webstorm), I get the following error.
/usr/local/bin/node app.js
/
Users/tst/WebstormProjects/NodeJsWithTypescript/app.js:2
var testme = new Hello();
^
ReferenceError: Hello is not defined
at Object.<anonymous> (/Users/tst/WebstormProjects/NodeJsWithTypescript/app.js:2:18)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
Process finished with exit code 8
You don't have to use modules. You can compile with --out flag
But external modules with commonjs is highly recommended if targeting nodejs : http://m.youtube.com/watch?v=KDrWLMUY0R0
Related
I'm working on bringing a ReactJS app over to a .NET setup. I'm trying to run an NPM script from the task runner (or anywhere within VS.) When I run my build command from the task runner, it fails due to an ES6 arrow function within one of my scripts. However, if I load up cmd.exe or powershell, navigate to the project and run it by hand, it runs perfectly.
Any idea why Visual Studio would be doing this?
The output looks something like this:
> cmd.exe /c npm run build --color=always
> ...cmd1
> ...cmd2
> mocha --reporter spec tools/testSetup.js "Scripts/app/**/*.test.js"
C:\Code\HAL\dev\Test\HALTest\HALReact\tools\testSetup.js:40
Object.keys(document.defaultView).forEach((property) => {
^
SyntaxError: Unexpected token >
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at C:\Code\HAL\dev\Test\HALTest\HALReact\node_modules\mocha\lib\mocha.js:220:27
at Array.forEach (native)
at Mocha.loadFiles (C:\Code\HAL\dev\Test\HALTest\HALReact\node_modules\mocha\lib\mocha.js:217:14)
at Mocha.run (C:\Code\HAL\dev\Test\HALTest\HALReact\node_modules\mocha\lib\mocha.js:469:10)
at Object.<anonymous> (C:\Code\HAL\dev\Test\HALTest\HALReact\node_modules\mocha\bin\_mocha:404:18)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:906:3
The file that it errors on basically just sets up JSDOM:
process.env.NODE_ENV = 'test';
// Register babel so that it will transpile ES6 to ES5
// before our tests run.
require('babel-register')();
// Disable webpack-specific features for tests since
// Mocha doesn't know what to do with them.
require.extensions['.css'] = function () {return null;};
require.extensions['.png'] = function () {return null;};
require.extensions['.jpg'] = function () {return null;};
// Configure JSDOM and set global variables
// to simulate a browser environment for tests.
var jsdom = require('jsdom').jsdom;
var exposedProperties = ['window', 'navigator', 'document'];
global.document = jsdom('');
global.window = document.defaultView;
Object.keys(document.defaultView).forEach((property) => {
if (typeof global[property] === 'undefined') {
exposedProperties.push(property);
global[property] = document.defaultView[property];
}
});
global.navigator = {
userAgent: 'node.js'
};
documentRef = document; //eslint-disable-line no-undef
Again, I can run this from the CLI directly, and it will work. It has babel-register invoked. I'm just not sure why it wants to error here. If I swap out the arrow function with a regular function, I get other errors in my tests, so it's like the task runner is not able to find babel, or is losing some environmental setting.
I'd like to be able to use the cool es6 classes feature of nodejs 4.1.2
I created the following project:
a.js:
class a {
constructor(test) {
a.test=test;
}
}
index.js:
require('./a.js');
var b = new a(5);
as you can see I create a simple class that it's constructor gets a parameter. and in my include i require that class and create a new object based on that class. pretty simple.. but still i'm getting the following error:
SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
at exports.runInThisContext (vm.js:53:16)
at Module._compile (module.js:413:25)
at Object.Module._extensions..js (module.js:452:10)
at Module.load (module.js:355:32)
at Function.Module._load (module.js:310:12)
at Module.require (module.js:365:17)
at require (module.js:384:17)
at Object.<anonymous> (/Users/ufk/work-projects/bingo/server/bingo-tiny/index.js:1:63)
at Module._compile (module.js:434:26)
at Object.Module._extensions..js (module.js:452:10)
any ideas why ?
Or you can run like this:
node --use_strict index.js
i'm still confused about why 'use strict' is needed, but this is the code that works:
index.js:
"use strict";
var a = require('./a.js');
var b = new a(5);
a.js:
"use strict";
class a {
constructor(test) {
a.test=test;
}
}
module.exports=a;
Ok so node.js has been driving me crazy. I have been trying to run the exact same code from the book. But it throwing me an error. The code is simple and watches a file for changes
const fs= require('fs');
fs.watch('target.txt', function() {
console.log("File 'target.txt' just changed!");
});
console.log("Now watching target.txt for changes");
the js file for the code and text.txt is in the same dir. And I get this error
$ node --harmony watcher.js
fs.js:1051
throw errnoException(process._errno, 'watch');
^
Error: watch ENOENT
at errnoException (fs.js:1019:11)
at FSWatcher.start (fs.js:1051:11)
at Object.fs.watch (fs.js:1076:11)
at Object.<anonymous> (C:\cygwin64\home\Sinan\try\watcher.js:5:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
Thanks beforehand.
I would also appropriate an uptodate source for learning node, I have tried 2 books and I can not even run example codes
I removed .txt extension and it worked.
fs.watch('target', function () {
console.log("File target.txt just changed");
});
This question already has answers here:
Cannot run Mocha with CoffeeScript
(6 answers)
Closed 3 years ago.
I'm trying to get Mocha to run in nodejs and expressjs. My test is as follow:
assert = require 'assert'
request = require 'request'
app = require '../../server'
describe "authentication", ->
describe "GET /login ", ->
body = null
before (done) ->
options =
uri: "http://localhost:3000/login"
request options, (err, response, _body) ->
body = _body
done()
it "has user field", ->
assert.ok /user/.test(body)
# assert.match body, /user/
I have added coffee-script as a dependency in my server.js file:
require('coffee-script');
var express = require('express');
var http = require('http');
var path = require('path');
var app = model.exports = express();
And I have a helper file _helper.js:
require('coffee-script')
I run the command:
mocha test/_helper.js test\apps\authentication-test.coffee
which gives the following error:
(exports, require, module, __filename, __dirname) { assert = require 'assert'
SyntaxError: Unexpected string
at Module._compile (module.js:439:25)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at C:\Program Files\nodejs\node_modules\mocha\lib\mocha.js:172:27
at Array.forEach (native)
at Mocha.loadFiles (C:\Program Files\nodejs\node_modules\mocha\lib\mocha.js:16
9:14)
at Mocha.run (C:\Program Files\nodejs\node_modules\mocha\lib\mocha.js:356:31)
at Object.<anonymous> (C:\Program Files\nodejs\node_modules\mocha\bin\_mocha:3
59:16)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)
at startup (node.js:119:16)
at node.js:902:3
Anyone sees what I'm missing ?
If you're using CoffeeScript 1.7, you'll need to use require the coffee-script/register module to be able to require and compile .coffee files on the fly (see changelog). Try running Mocha with:
mocha --compilers coffee:coffee-script/register
Or modifying your Mocha helper file:
require('coffee-script/register')
Mocha doesn't check for Coffeescript files by default. You have to specified a compiler option:
mocha --compilers coffee:coffee-script
or add
--compilers coffee:coffee-script
in your mocha.opts file
I needed two changes to get CoffeeScript to work with Mocha:
--require coffee-script/register
--compilers coffee:coffee-script/register
:)
I have a somewhat easy answer for you guys to answer as you always do.
Im new at functions and whatnot, iv watched some tutorials about exporting your functions to another node.js application,
Im attempting to generate some random numbers for a external module.
this is what i have setup.
(index.js file)
function randNumb(topnumber) {
var randnumber=Math.floor(Math.random()*topnumber)
}
module.exports.randNumb();
(run.js)
var index = require("./run.js");
console.log(randnumber);
Well My Issue is when i run the index.js file, i get this error from the console.
TypeError: Object #<Object> has no method 'randNumb'
at Object.<anonymous> (C:\Users\Christopher Allen\Desktop\Node Dev Essential
s - Random Number\index.js:8:16)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)
I ran the run.js in the beginning, this is what i got.
ReferenceError: randNumb is not defined
at Object.<anonymous> (C:\Users\Christopher Allen\Desktop\Node Dev Essential
s - Random Number\run.js:3:1)
at Module._compile (module.js:449:26)
at Object.Module._extensions..js (module.js:467:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Module.runMain (module.js:492:10)
at process.startup.processNextTick.process._tickCallback (node.js:244:9)
In the randNum function, don't forget to:
return randnumber;
Also in index.js, export the function like so:
exports.randNumb = randNumb;
Invoke it like this in run.js:
console.log(randNumber(10));
You didn't export the var at all.
Your index.js should be :
function randNumb(topnumber) {
return Math.floor(Math.random()*topnumber)
}
module.exports.randnumber = randNumb(10); //replace 10 with any other number...
run.js should be :
var index = require("./run.js");
console.log(index.randnumber);