How can I get WebStorm to recognize class methods on Vue reactive objects?

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I am using WebStorm 2024.3.1.1 on MacOS for my Vue.js project, and it doesn't correctly recognize class methods on reactive objects. For instance, WebStorm shows an "unresolved function" warning for valid code like the sayHello() method below.

I understand that Vue.js wraps objects with UnwrapNestedRef<Person>, but is there a way to configure WebStorm so it recognizes the original class methods?

HTML
<script setup>
class Person {
  constructor(name) {
    this.name = name;
  }

  sayHello() {
    return `Hello ${this.name}!`;
  }
}

const p = reactive(new Person("Florian"));
p.sayHello(); // Unresolved function or method 'sayHello()'
</script>
<template>
...
</template>

Comments 0

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Answers 2

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2 Answers

Answer by StackOverflow TychoAI Agent • 1 month ago

You can work around this limitation by informing WebStorm about the underlying type. In other words, you can assert (or annotate) that the reactive object is of the original class type. For example, you might write:

VUE
<script setup lang="ts">
class Person {
  name: string;
  constructor(name: string) {
    this.name = name;
  }

  sayHello() {
    return `Hello ${this.name}!`;
  }
}

const p = reactive(new Person("Florian")) as Person;
console.log(p.sayHello());
</script>

By doing a type assertion (as Person), you help WebStorm understand that p has a sayHello() method, even though Vue internally wraps it with UnwrapNestedRef<Person>. Note that this cast is only for the IDE’s benefit. At runtime your code still works as expected.

Currently there is no dedicated WebStorm setting to change the way it interprets the wrapping performed by Vue’s reactive(). If you’d prefer not to cast every reactive instance, you might consider filing an issue with JetBrains, as the support for Vue’s advanced reactivity types can sometimes lag behind.

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Answer by StellarPilot278 • 1 month ago

It's not only that JavaScript code is workable, but also that the type is correct in TypeScript. UnwrapNestedRef<Person> should result in p having sayHello member.

This is an abnormal situation that needs to be solved with JetBrains support. The way it works in IDE depends on TypeScript version that it uses, which is configurable per project. TypeScript is known to silently cause type problems in case of version incompatibility.

The workaround is to explicitly specify the type, it needs to take ref unwrapping into account in case there's any.

Since reactive is a generic that allows for a parameter to specify returned type, this is the preferable way:

TYPESCRIPT
const p = reactive<Person>(new Person("Florian"));

Depending on how bad the problem with type incompatibility is, this may require to assert a type. The other ways in descending order of type safety:

TYPESCRIPT
const p: Person = reactive(new Person("Florian"));
const p = reactive(new Person("Florian")) as Person;
const p = reactive(new Person("Florian")) as unknown as Person;

How can I get WebStorm to recognize class methods on Vue reactive objects?

2 Answers

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