feat(eslint): enable allowExpressions in `@typescript-eslint/explic…

…it-function-return-type`

Resolves #51

BREAKING CHANGE: Types are no longer required in expressions (callbacks), as the parent will flag
unexpected return types.

eslint/rules/typescript/index.js

@@ -20,7 +20,10 @@ module.exports = {
      *
      * 🚫 Not fixable - https://typescript-eslint.io/rules/explicit-function-return-type/
      */
-    '@typescript-eslint/explicit-function-return-type': 'warn',
+    '@typescript-eslint/explicit-function-return-type': [
+      'warn',
+      { allowExpressions: true },
+    ],
     /**
      * Require using function property types in method signatures.
      *