The return type of a getter is `any` if the object contains a method and is processed by a generic function

I am facing an issue with my code where the getter's return type is set to any, even though the actual return type should be clear. There are certain additional functions triggering this behavior:

// This is necessary for reproduction
const wrapperFunction = <T>(obj: T) => obj;

const store = wrapperFunction({
  value: 'Super max',

  get simpleGetter() {
    return this.value;
},

// This is necessary for reproduction
bark() {
    console.log('WUF');
},
});

// This results in 'any' type
const val = store.simpleGetter;
// This will log "Super max"
console.log(val);

Here is a link to TypeScript playground for full reproduction: Full reproduction

Answer №1

It appears that there is a potential TypeScript bug identified: https://github.com/microsoft/TypeScript/issues/49511

To work around this issue, one option is to manually specify the return type or store the object in a variable before passing it to the generic function:

// For reproduction purposes
const wrapperFunction = <T>(obj: T) => obj;

const storeObj = {
  value: 'Super max',

  get simpleGetter() {
    return this.value;
},

// For reproduction purposes
bark() {
    console.log('WUF');
},
};
const store = wrapperFunction(storeObj);

// The value is now stored as a string
const val = store.simpleGetter;

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