ESlint Duplicate Identifier Parsing Error

[sumleo]

Tell us about your environment

Node version: v14.12.0
npm version: v6.14.8
Local ESLint version: Not found
Global ESLint version: v7.13.0 (Currently used)

What parser (default, @babel/eslint-parser, @typescript-eslint/parser, etc.) are you using?
default
Please show your full configuration:

Configuration

What did you do? Please include the actual source code causing the issue, as well as the command that you used to run ESLint.

var t = 1,
  app = 2;
function t(t) {
  var n;
  for (n in t) return !1;
  return !0;
}

eslint test.js

What did you expect to happen?
No errors while parsing it (Try it with chrome console)

What actually happened? Please include the actual, raw output from ESLint.
/Users/test/index/test.js
3:10 error Parsing error: Identifier 't' has already been declared

✖ 1 problem (1 error, 0 warnings)

Are you willing to submit a pull request to fix this bug?

[mdjermanovic]

Hi @sumleo, thanks for the issue!

Can you please share your configuration?

This is a correct parsing error in modules, as top-level functions in modules cannot be redeclared. It works in chrome console since it's parsed as a script.

Online demo with sourceType: "module" (parsing error)

Online demo with sourceType: "script" (no parsing error)

[eslint-deprecated[bot]]

Hi @sumleo, thanks for the issue. It looks like there's not enough information for us to know how to help you.

If you're reporting a bug, please be sure to include:

1. The version of ESLint you are using (run eslint -v)
2. What you did (the source code and ESLint configuration)
3. The actual ESLint output complete with numbers
4. What you expected to happen instead

Requesting a new rule? Please see Proposing a New Rule for instructions.

Requesting a rule change? Please see Proposing a Rule Change for instructions.

If it's something else, please just provide as much additional information as possible. Thanks!