"'const' is not defined"

[garyking]

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

module.exports = {
  extends: [],
  parser: '@typescript-eslint/parser',
  plugins: ['@typescript-eslint'],
  rules: {}
}

const item = {
  a: 'a'
} as const;

export default item;

Expected Result

No error.

Actual Result

'const' is not defined no-undef

Versions

package	version
@typescript-eslint/parser	4.1.1
TypeScript	4.0.2
ESLint	7.9.0
node	14.8.0

[bradzacher]

We have passing tests for this in master:

typescript-eslint/packages/eslint-plugin/tests/eslint-rules/no-undef.test.ts

Lines 223 to 226 in f785965

	// https://github.com/typescript-eslint/typescript-eslint/issues/2477
	`
	const x = 1 as const;
	`,

As this was fixed in #2499.

This implies that likely you have multiple versions of our tooling installed at the same time.

[garyking]

rm -rf node_modules/ then yarn install did the trick.