Disallow the declaration of empty interfaces #2300

New Issue

MrUnknownDE · 2026-04-05T16:57:28+02:00

MrUnknownDE commented

2026-04-05 16:57:28 +02:00

Originally created by @chibuike-okpara on 5/17/2022

Disallow the declaration of empty interfaces.

An empty interface is equivalent to its supertype. If the interface does not implement a supertype, then the interface is equivalent to an empty object ({}). In both cases it can be omitted.

INCORRECT

// an empty interface
interface Foo {}

// an interface with only one supertype (Bar === Foo)
interface Bar extends Foo {}

// an interface with an empty list of supertypes
interface Baz {}

CORRECT

// an interface with any number of members
interface Foo {
  name: string;
}

// same as above
interface Bar {
  age: number;
}

// an interface with more than one supertype
// in this case the interface can be used as a replacement of a union type.
interface Baz extends Foo, Bar {}

*Originally created by @chibuike-okpara on 5/17/2022* Disallow the declaration of empty interfaces. An empty interface is equivalent to its supertype. If the interface does not implement a supertype, then the interface is equivalent to an empty object ({}). In both cases it can be omitted. **INCORRECT** ``` // an empty interface interface Foo {} // an interface with only one supertype (Bar === Foo) interface Bar extends Foo {} // an interface with an empty list of supertypes interface Baz {} ``` **CORRECT** ``` // an interface with any number of members interface Foo { name: string; } // same as above interface Bar { age: number; } // an interface with more than one supertype // in this case the interface can be used as a replacement of a union type. interface Baz extends Foo, Bar {} ```

MrUnknownDE closed this issue

2026-04-05 16:57:28 +02:00

MrUnknownDE added the good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue good first issue labels 2026-04-05 16:57:29 +02:00

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Reference: github/oneuptime#2300