71 lines
2.1 KiB
Plaintext
71 lines
2.1 KiB
Plaintext
---
|
|
description: 'Enforce using `@ts-expect-error` over `@ts-ignore`.'
|
|
---
|
|
|
|
> 🛑 This file is source code, not the primary documentation location! 🛑
|
|
>
|
|
> See **https://typescript-eslint.io/rules/prefer-ts-expect-error** for documentation.
|
|
|
|
TypeScript allows you to suppress all errors on a line by placing a comment starting with `@ts-ignore` or `@ts-expect-error` immediately before the erroring line.
|
|
The two directives work the same, except `@ts-expect-error` causes a type error if placed before a line that's not erroring in the first place.
|
|
|
|
This means its easy for `@ts-ignore`s to be forgotten about, and remain in code even after the error they were suppressing is fixed.
|
|
This is dangerous, as if a new error arises on that line it'll be suppressed by the forgotten about `@ts-ignore`, and so be missed.
|
|
|
|
## Examples
|
|
|
|
This rule reports any usage of `@ts-ignore`, including a fixer to replace with `@ts-expect-error`.
|
|
|
|
<!--tabs-->
|
|
|
|
### ❌ Incorrect
|
|
|
|
```ts
|
|
// @ts-ignore
|
|
const str: string = 1;
|
|
|
|
/**
|
|
* Explaining comment
|
|
*
|
|
* @ts-ignore */
|
|
const multiLine: number = 'value';
|
|
|
|
/** @ts-ignore */
|
|
const block: string = 1;
|
|
|
|
const isOptionEnabled = (key: string): boolean => {
|
|
// @ts-ignore: if key isn't in globalOptions it'll be undefined which is false
|
|
return !!globalOptions[key];
|
|
};
|
|
```
|
|
|
|
### ✅ Correct
|
|
|
|
```ts
|
|
// @ts-expect-error
|
|
const str: string = 1;
|
|
|
|
/**
|
|
* Explaining comment
|
|
*
|
|
* @ts-expect-error */
|
|
const multiLine: number = 'value';
|
|
|
|
/** @ts-expect-error */
|
|
const block: string = 1;
|
|
|
|
const isOptionEnabled = (key: string): boolean => {
|
|
// @ts-expect-error: if key isn't in globalOptions it'll be undefined which is false
|
|
return !!globalOptions[key];
|
|
};
|
|
```
|
|
|
|
## When Not To Use It
|
|
|
|
If you are compiling against multiple versions of TypeScript and using `@ts-ignore` to ignore version-specific type errors, this rule might get in your way.
|
|
You might consider using [ESLint disable comments](https://eslint.org/docs/latest/use/configure/rules#using-configuration-comments-1) for those specific situations instead of completely disabling this rule.
|
|
|
|
## Further Reading
|
|
|
|
- [Original Implementing PR](https://github.com/microsoft/TypeScript/pull/36014)
|