Error with syntax import x = require('x')

[OliverJAsh]

Hi, thanks for your amazing work. I have some feedback but I am very aware this project is still in the very early stages.

TypeScript has the syntax import x = require('x') for importing specifically CommonJS modules. (ES6 module syntax is used for ES6 modules.) I have found that when using this syntax, the parser throws because it doesn't recognise the imported identifier. Example below.

Versions:

$ npm ls eslint typescript-eslint-parser
/Users/OliverJAsh/Development/samefourchords.com
├── [email protected]
└── [email protected]

ESLint config:

{
    "extends": "eslint:recommended",
    "parser": "typescript-eslint-parser",
    "parserOptions": {
        "ecmaVersion": 6,
        "sourceType": "module",
        "ecmaFeatures": {
            "modules": true
        }
    }
}

Input and output:

$ echo "import slug = require('slug'); slug;" > test.js
$ eslint test.js
224

/Users/OliverJAsh/Development/samefourchords.com/test.js
  1:32  error  'slug' is not defined  no-undef

✖ 1 problem (1 error, 0 warnings)

[nzakas]

That's not a parser error, it's an ESLint warning. We aren't yet at the point where it makes sense to track such problems because nothing is known to work at this point. The version you're using just completely skips over that import statement. Even if that started to work, ESlint would still produce a warning because scope calculation wouldn't recognize the syntax. So, we have a long way before this has a chance to work.

[OliverJAsh]

Hi, this still appears to be an issue. Do you know whether this is something we can fix? Keen to help :-)

[nzakas]

We are a long ways from being able to fix this. It requires an augmentation to how scope variables are found in ESLint, and that's a ton of work. Sit tight, we are very early in this process and will get there eventually. If you want to help otherwise, we do need help addressing bugs as they are found.

[j-f1]

@grenudi What version of TypeScript-ESLint-parser are you using?

[grenudi]

sorry, my fault