How to make this work with Espree

[aminya]

Espree doesn't have onComment like acorn. How can I make this work with Espree?

[wooorm]

That’s described in the readme of espree https://github.com/eslint/espree#options.

[aminya]

It doesn't work. Passing true to comments doesn't create an array.

[wooorm]

at the top of the resulting node, as it says, did you try that?

[aminya]

Yes.

Parsing this file:

const espree = require("espree")
const { attachComments } = require('./vendor/estree-util-attach-comments.cjs')

code = `
        /**
         * @callback MyCallback
         * @param {number} arg1
         */
        const cb = (arg) => 1;
        `
ast = espree.parse(code, {comments: true, ecmaVersion: 2021})
console.log(ast)

Gives:

Node {
  type: 'Program',
  start: 0,
  end: 128,
  body: [
    Node {
      type: 'VariableDeclaration',
      start: 97,
      end: 119,
      declarations: [Array],
      kind: 'const'
    }
  ],
  sourceType: 'script'
}

There is nothing to pass to attachComments

I want the original attach comment behavior. Not sure if this package helps
eslint/js#405

[wooorm]

The readme says comment, not comments: https://runkit.com/embed/z582pgdkpvzx

[aminya]

Ah, thanks! I am going to make a PR adding the example to the readme.

[wooorm]

Thanks, appreciate it — but: I’m not interested in a list of examples for every JS parser, because there are so many. Maybe something small?
Although a typo can happen to everyone, the docs of acorn and espree are pretty clear, wouldn’t you say?

[aminya]

Created one: #4

Feel free to merge.