prefer-const not work with mutiple functions

[rupertqin]

Tell us about your environment

Node version: v10.16.3
npm version: v6.12.0
Local ESLint version: v6.6.0
Global ESLint version: v6.6.0

What did you expect to happen?

rule of prefer-const mess up in multiple function.
the config is:

"prefer-const": [
      "warn",
      {
        "destructuring": "all",
        "ignoreReadBeforeAssign": true
      }
    ],

file a.js

function a (){
  let foo =0;
  foo = 1;
}
function b (){
  let foo =0;
  foo = 1;
}
function c (){
  let foo =0;
  foo = 1;
}

will eslint --fix output as

function a (){
  let foo =0;
  foo = 1;
}
function b (){
  const foo =0;
  foo = 1;
}
function c (){
  const foo =0;
  foo = 1;
}

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

Can't help with resolution.

[g-plane]

It seems that I can't reproduce via online demo.

Can you tell us more detail?

[rupertqin]

@g-plane try this

function a() {
  let foo = 0,
    bar = 1;
  foo = 1;
}
function b() {
  let foo = 0,
    bar = 1;
  foo = 1;
}
function c() {
  let foo = 0,
    bar = 1;
  foo = 1;
}

[g-plane]

Reproduced. Online demo.

[yeonjuan]

May I try this on?

[g-plane]

Feel free to do this!

[kaicataldo]

@g-plane Can you explain what the bug here is? I'm not sure I understand why the above code being flagged is incorrect.

[g-plane]

The bug is about autofix, while problem reports work as intended.

[kaicataldo]

Oh, I see - yes, that does look like a bug.