Issue TS8011 in Angular 6 is related to the restriction on using type arguments only in files with the .ts extension

I have a project in Angular 6 where I need to integrate a JS library. This library is confidential, so I can't disclose its details. The problem I'm facing is that the TypeScript compiler seems to misinterpret characters like <<24>>, mistaking them for type casting when they're not. As a result, I encounter the following error during compilation:

error TS8011: 'type arguments' can only be used in a .ts file

The file I'm trying to include is a standard JS file that cannot be modified since it's a minified third-party library that is not accessible via NPM.

Initially, my approach was to exclude the file so the TS compiler would ignore it, but that strategy didn't work. Below is an example of the tsconfig.json configuration that I attempted:

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "module": "es2015",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "allowJs": true,
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ]
  },
  "exclude": [
    "./src/js/MyLib.js"
  ]
}

I've experimented with both enabling and disabling "allowJs," yet the error persists.

Does anyone have a solution for effectively ignoring this problematic file so that I can simply import it using a script tag?

Thank you!

Answer №1

To include standard .js files in your project, there are two recommended methods:

  1. Insert the script reference in the script array within the angular.json file
  2. Add the script reference directly into the index.html file

I suggest opting for the first option based on the official documentation:

https://angular.io/guide/workspace-config#additional-build-and-test-options

The JavaScript script files included here will be loaded globally into the project. They will behave as if they were added through a script tag in the index.html file. Refer to Styles and scripts configuration for more details.

If you encounter issues, it could be due to attempting to use import statements or referencing the script file in a way that conflicts with the TypeScript Compiler (tsc).

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