Learn the art of bypassing TypeScript errors using @ts-ignore!

I recently encountered an issue when trying to import a pure JavaScript library into a TypeScript project, resulting in the error message: 

Could not find a declaration file for module xxx
.

After some research, I learned that this error can be suppressed using the comment @ts-ignore. However, when I added this comment before the line causing the first error, I received another error:

Do not use "// @ts-ignore" comments because they suppress compilation errors  @typescript-eslint/ban-ts-ignore

Can anyone advise on how to resolve this error while still suppressing the original message?

typescripteslint

Answer №1

Instead of completely disabling the eslint rule, it is more practical to ignore the eslint error at a specific location by using the following code:

// eslint-disable-next-line @typescript-eslint/ban-ts-comment
// @ts-ignore

Answer №2

If you want to avoid using @ts-ignore

Alternatively, you have the option to turn off the eslint rule. Simply add this to your eslint configuration file (.eslintrc or similar)

...
  "rules": {
    "@typescript-eslint/ban-ts-ignore": "off"
  }
...

UPDATE: For users of @typescript-eslint/eslint-plugin version 2.18 or higher, the rule has been renamed to ban-ts-comment and you should include

"@typescript-eslint/ban-ts-comment": "off"

instead. Refer to the changelog

Answer №3

Choosing to post as a response rather than a comment on the approved answer due to my limited reputation. I am eager to share my thoughts and potentially assist others.

In my case, the guideline was:

@typescript-eslint/ban-ts-comment

instead of using ban-ts-ignore.

Answer №4

My suggestion is to utilize @ts-ignore with a mandatory description requirement. This can be set up through the configuration in .eslintrc.js. Visit documentation for more details

rules: {
  '@typescript-eslint/ban-ts-comment': [
    'error',
    {'ts-ignore': 'allow-with-description'},
  ],
},

It is essential to include a description when using ignore statements. This involves adding a colon : after the ignore directive and providing the description (which may have a specified minimumDescriptionLength).

For instance:

// @ts-ignore: Example description here

In this case, the description would read as Example description here

Answer №5

Starting from TypeScript version 3.9, developers can utilize the @ts-expect-error annotation.

By adding a // @ts-expect-error comment before a line of code, TypeScript will suppress any associated error messages; however, it will also warn if there was no actual error to be suppressed.

The 

@typescript-eslint/ban-ts-comment
rule permits the usage of this kind of comment by default, as long as a descriptive reason is provided with it.

For instance:

// @ts-expect-error: No declaration file for module
import something from 'somemodule';

In addition, to address the issue of a missing declaration file for a module, if a corresponding types definition cannot be found on Definitely Typed (e.g. @types/module_name), one can choose to declare the module in any .d.ts file within the project to eliminate the error message.

declare module 'module_name';

Answer №6

When launching the program with npm, it is possible to define the rules in the package.json file. The format varies from what was mentioned previously:

"eslintConfig": {
    . . .
    "rules": {
      "ban-ts-comment": 0
    },
    . . .
}

I can confirm that using ban-ts-comment rather than ban-ts-ignore works (tested only with 

typescript-eslint/eslint-plugin v2.33.0
)

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