Removing [ts] errors from JS files In VS Code

On Windows- File > Preferences > Settings Go to Extensions->TypeScript-> Javascript>Validate make sure Enable/disable JavaScript validation. is not checked

There's a GitHub issue that discusses the [ts] token from the errors in a bit more detail. The most relevant comment to this discussion is:

Yes. The TypeScript extension powers our javascript intellisense which is why you see [TS] in your js file. That only indicates what extension is providing that error.

You can disable this validation itself by adding the following to an appropriate settings.json file:

"javascript.validate.enable": false

The docs discusses this option a little bit further:

With javascript.validate.enable: false, you disable all built-in syntax checking. If you do this, we recommend that you use a linter like ESLint to validate your source code.

As noted above, this disables all built-in syntax checking. Although the suggestion is to use something like ESLint instead, there might be another option if you're specifically concerned about the import/export errors. You can add a jsconfig.json file to your project with the following content:

{
    "compilerOptions": {
        "module": "es2015"
    }
}

This instructs VS Code to use the es2015 module syntax (import/export), which appears to make it happier.