TypeScript with system.js module running in node error

Question

I would like to use the system.js module manager with TypeScript. My plan is to run typescript in node

The problem is that, if i mark my Main.js (generated from Main.ts) file as the entry point, it will crash with this error:

ReferenceError: System is not defined

And it's normal, because my generated code start like this: System.register(["./Apple"], function(exports_1) {

And for sure, there is no System class in node by default. So how to make typescript or node to load the system.js module?

I can create an extra js file to load it with require, but i'm looking for a native solution inside typescript

Thanks!

gilamran · Accepted Answer · 2015-09-07 20:50:39Z

6

You should tell the compiler to export your modules into commonjs and not systemjs. Node is using commonjs as its native module system.

answered Sep 7, 2015 at 20:50

gilamran

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5 Comments

Grosmar Over a year ago

But i think system.js support node according to system.js documentation: NodeJS To load modules in NodeJS, install SystemJS with: npm install systemjs We can then load modules equivalently to in the browser:

var System = require('systemjs');  System.transpiler = 'traceur';  // loads './app.js' from the current directory System.import('./app').then(function(m) {   console.log(m); });

If using TypeScript, set global.ts = require('typescript') before importing to ensure it is loaded correctly.

gilamran Over a year ago

This is a way to load node modules into the browser, just like browserify... this will not help you load modules in node. NodeJS is already capable of loading modules, they are using commonjs. and TypeScript can transpile the modules into commonjs.

Grosmar Over a year ago

I do not agree with you. You can use system.js in node enviroment too, and i was successfully managed it. You just have to load it: require("systemjs") and after you can use all the features of systemjs. My problem is that for this i need to add an extra init.js file to my project, but this way for some reason i cannot debug my typescript sources (when i use the normal commonjs system it works)

gilamran Over a year ago

Why do you insist on using systemjs if commonjs works for you?

David Over a year ago

Just to add to the answer, here is how it should be done if you're using tsconfig.json: inside compilerOptions section, replace "module": "system" with "module": "commonjs". This way, when running tsc, it'll compile it to require instead of System.register. Also, If you use TypeScript for the client side as well, you may get an error: ReferenceError: require is not defined, in this case you should remove the “format: ‘register’ “ from your System.Config.

Michael Vashchinsky · Accepted Answer · 2015-09-22 17:09:39Z

2

I might not understand correctly, but have you tried to follow the node.js section on system.js GitHub Readme (https://github.com/systemjs/systemjs)?

$ npm install systemjs

then:

var System = require('systemjs');

// loads './app.js' from the current directory
System.import('./app').then(function(m) {
  console.log(m);
});

Hope that helps.

answered Sep 22, 2015 at 17:09

Michael Vashchinsky

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Comments

Shruti Srivastava · Accepted Answer · 2016-07-15 13:55:39Z

2

Are you using tsconfig file? You have add the module:'system' I was facing a similar problem, this fixed it. Also ensure that the system.src.js is at top of the scripts.

answered Jul 15, 2016 at 13:55

Shruti Srivastava

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