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Showing content from https://typescript-eslint.io/rules/no-unsafe-function-type below:

no-unsafe-function-type | typescript-eslint

Disallow using the unsafe built-in Function type.

TypeScript's built-in Function type allows being called with any number of arguments and returns type any. Function also allows classes or plain objects that happen to possess all properties of the Function class. It's generally better to specify function parameters and return types with the function type syntax.

"Catch-all" function types include:

• () => void: a function that has no parameters and whose return is ignored
• (...args: never) => unknown: a "top type" for functions that can be assigned any function type, but can't be called

Examples of code for this rule:

• ❌ Incorrect
• ✅ Correct

let noParametersOrReturn: Function;
noParametersOrReturn = () => {};

let stringToNumber: Function;
stringToNumber = (text: string) => text.length;

let identity: Function;
identity = value => value;

let noParametersOrReturn: () => void;
noParametersOrReturn = () => {};

let stringToNumber: (text: string) => number;
stringToNumber = text => text.length;

let identity: <T>(value: T) => T;
identity = value => value;

• Flat Config
• Legacy Config

eslint.config.mjs

export default tseslint.config({
  rules: {
    "@typescript-eslint/no-unsafe-function-type": "error"
  }
});

.eslintrc.cjs

module.exports = {
  "rules": {
    "@typescript-eslint/no-unsafe-function-type": "error"
  }
};

This rule is not configurable.

If your project is still onboarding to TypeScript, it might be difficult to fully replace all unsafe Function types with more precise function types. You might consider using ESLint disable comments for those specific situations instead of completely disabling this rule.

• Avoiding anys with Linting and TypeScript
• no-empty-object-type
• no-restricted-types
• no-unsafe-call
• no-wrapper-object-types

• Rule source
• Test source

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