如何修复“TypeError：System.config 不是函数”

Question

I am learning TypeScript and today I installed SystemJS so that I could import some files. First I only imported the main file that needed being run ie app.js, in index.html

<script src="node_modules/systemjs/dist/system.js"></script>
<script>
     System.import('app.js');
</script>

But I got this error: https://i.stack.imgur.com/lz7Hm.png

So I turned my html code into this:

<script src="node_modules/systemjs/dist/system.js"></script>
<script>
    System.config({
        baseURL: '/',
        packages: {
            "/ts": {
                defaultExtension: 'js'
            }
        }
    });
    System.import('app.js');
</script>

Now I am getting this error: https://i.stack.imgur.com/RS0k7.png

package.json:

{
  "name": "ts",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "dependencies": {
    "jquery": "^3.4.0",
    "systemjs": "^3.1.2",
    "typescript": "^3.4.2"
  },
  "devDependencies": {
    "lite-server": "^2.4.0"
  },
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "lite-server"
  },
  "author": "",
  "license": "ISC"
}

app.ts: console.log("Hello")

I am stuck at this point. Any help would be appreciated. Thanks in advance.

Answer 1

I guess you would have upgraded to the latest system.js by mistake... SystemJS 2.0 does not support System.Config Refer to https://guybedford.com/systemjs-2.0

It is instead done using https://github.com/systemjs/systemjs/blob/2.0.0/docs/package-name-maps.md

If you managed to update the code by now, might as well post the updated sample here for use of everyone.

Answer 2

Locate system.js and put System.config() inside it, this would fix the error.

<script src="node_modules/systemjs/dist/system.js">
        System.config({
        baseURL: "/",
        packages: {
          "/": {
            defaultJSExtensions: true
          }
        }
      })
      System.import("app.js")</script>
<script>