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Disallow unnecessary constraints on generic types.


Some problems reported by this rule are manually fixable by editor suggestions.

Generic type parameters (<T>) in TypeScript may be "constrained" with an extends keyword. When no extends is provided, type parameters default a constraint to any. It is therefore redundant to extend from any.

module.exports = {
"rules": {
"@typescript-eslint/no-unnecessary-type-constraint": "error"
Try this rule in the playground ↗


interface FooAny<T extends any> {}

type BarAny<T extends any> = {};

class BazAny<T extends any> {
quxAny<U extends any>() {}

const QuuxAny = <T extends any>() => {};

function QuuzAny<T extends any>() {}


This rule is not configurable.

When Not To Use It

If you don't care about the specific styles of your type constraints, or never use them in the first place, then you will not need this rule.