[Compiler API] function which check if a class implements an interface

Search Terms

Compiler API, InterfaceDeclaration, ClassDeclaration, Checker

Suggestion

A function to check whether a ClassDeclaration implements an InterfaceDeclaration

Use Cases

Hello, I wanted to check whether a ClassDeclaration of a.ts file implements an InterfaceDeclaration from b.ts file using Compiler API.
But I couldn't find a method or a function for it.

Examples

function isClassImplementInterface(
  ts.ClassDeclaration: classDeclaration,
  ts.InterfaceDeclaration: interfaceDeclaration
): boolean {
  // return true if classDeclaration implements interfaceDeclaration correctly
}

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

Start by reading the Compiler API around InterfaceDeclaration, ClassDeclaration, and the Checker. Determine how cross-file class/interface relationships are represented and what API shape the request requires. Done means agreeing on and documenting a supported function with tests for whether a class implements an interface.