Recommended ESLint rules that are already handled by TypeScript are turned off inplugin:@typescript-eslint/recommended.
The recommendedno-func-assign rule should be included in the list as it triggers an ESLint as well as a TypeScript error.

Repro

{"extends": ["eslint:recommended","plugin:@typescript-eslint/eslint-recommended","plugin:@typescript-eslint/recommended"  ]}

functionfoo(){}foo=bar;

Expected Result

A simple TypeScript error for line 2:

• TS2539: Cannot assign to 'foo' because it is not a variable.

Actual Result

A duplicate error for line 2, one coming from TypeScript the other one coming from ESLint:

• TS2539: Cannot assign to 'foo' because it is not a variable.
• ESLint: 'foo' is a function.(no-func-assign)

Additional Info

Versions