[no-empty-pattern] gets triggered on a non-destructuring array declaration

[mcuelenaere]

Minimal testcase that should reproduce the error:

.eslintrc.json:

{
  "extends": [
    "typescript"
  ]
}

test.js:

const x = [];
const y = x.reduce(a => a, []).indexOf('abc') !== -1;

eslint test.js:

/Users/mcuelenaere/test.js
  2:28  error  Unexpected empty array pattern  no-empty-pattern

✖ 1 problem (1 error, 0 warnings)

[madbence]

@mcuelenaere i think this is the same problem as JamesHenry/typescript-estree#18

[bradzacher]

I tested this locally with typescript-eslint-parser@20.0.0, and typescript-estree@4.0.0, and it seemed to work fine.

Closing this has a dependency on:

1. typescript-eslint-parser updating its typescript-estree dependency to 4.0.0.
2. updating our dependency typescript-eslint-parser to that version.