Typescript @ts-ignore/@ts-expect-error hinder excessive property checks on literals

When working with TypeScript, it’s common to come across scenarios where you want to ignore or expect errors for certain properties on literals. This can be useful when dealing with external libraries or when you know that a particular property will not be present at runtime. In this blog post, we will explore two solutions to handle this situation using the @ts-ignore and @ts-expect-error annotations.

Solution 1: Using @ts-ignore

The @ts-ignore annotation allows you to explicitly tell TypeScript to ignore the error raised for a specific line of code. This can be handy when you want to bypass excessive property checks on literals. Here’s an example:

// @ts-ignore
const person = {
  name: 'John Doe',
  age: 30,
  // @ts-ignore
  address: '123 Main St',
};

console.log(person.name);
console.log(person.age);
console.log(person.address); // No error raised

In the above code snippet, we have used @ts-ignore to ignore the error raised for the address property. This allows us to access the property without TypeScript complaining about it.

Solution 2: Using @ts-expect-error

The @ts-expect-error annotation is similar to @ts-ignore, but it provides a more explicit way to expect an error for a specific line of code. This can be useful when you want to ensure that a property is not present at runtime. Here’s an example:

// @ts-expect-error
const person = {
  name: 'John Doe',
  age: 30,
  address: '123 Main St',
};

console.log(person.name);
console.log(person.age);
console.log(person.address); // Error expected

In the above code snippet, we have used @ts-expect-error to explicitly expect an error for the address property. This ensures that TypeScript raises an error if the property is accessed.

Both @ts-ignore and @ts-expect-error annotations provide a way to handle excessive property checks on literals in TypeScript. However, it’s important to use them judiciously and only when necessary. Ignoring or expecting errors should be done with caution, as it can lead to potential bugs and make the code less maintainable.

That’s it for this blog post! We explored two solutions to handle excessive property checks on literals in TypeScript using the @ts-ignore and @ts-expect-error annotations. Remember to use these annotations sparingly and only when absolutely necessary. Happy coding!

Typescript @ts-ignore/@ts-expect-error hinder excessive property checks on literals