Setting for more strict validation on interface methods

Question

We are running a monorepo and have contracts with one interface of methods that takes a request and returns a Promise<Response>. One interface example is such:

interface MyApi {
   getUsers(args: GetUsersRequest): Promise<GetUsersResponse>;
}

When we implement this, we want TypeScript to not build/compile and give an error if this contract is not met. However this passed the build, so I am wondering if there is a setting I am missing that I can add:

class MyController implements MyApi {
    getUsers(@Body() body: GetUsersRequest): Promise<any> {
       return new Promise((res, rej) => {
           res(1);
       });
    }
}

This method should be forced to return Promise<GetUsersResponse> per the contract.

tsconfig.json:

{
    "compilerOptions": {
    "module": "commonjs",
        "declaration": true,
        "removeComments": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "allowSyntheticDefaultImports": true,
        "target": "es2017",
        "sourceMap": true,
        "outDir": "./dist",
        "baseUrl": "./",
        "incremental": true,
        "skipLibCheck": true,
        "strictNullChecks": false,
        "noImplicitAny": false,
        "strictBindCallApply": false,
        "forceConsistentCasingInFileNames": false,
        "noFallthroughCasesInSwitch": false,
        "typeRoots": ["./types"],
        "types": ["@types/jest", "node"],
        "rootDir": "./"
    },
    "modulePaths": ["<rootDir>"]
}