How to fix angular reactive forms ( form.value ) throwing eslint typedef error

How to fix Angular reactive forms (form.value) throwing ESLint typedef error

If you are working with Angular and using reactive forms, you may have encountered an issue where ESLint throws a typedef error when accessing the form.value property. This error occurs because ESLint cannot infer the type of the form.value object. In this blog post, we will explore two solutions to fix this issue.

Solution 1: Use type assertion

One way to resolve the ESLint typedef error is by using type assertion. By explicitly specifying the type of the form.value object, we can help ESLint understand the structure of the object.

Here’s an example:

const formValue = (this.myForm.value as MyFormType);
console.log(formValue.property);

In the above code snippet, we use the as MyFormType syntax to assert that this.myForm.value is of type MyFormType. Replace MyFormType with the actual type of your form.

Solution 2: Disable ESLint rule

If you prefer not to use type assertion or if it’s not feasible in your situation, you can disable the ESLint rule that is causing the typedef error. This approach should be used with caution, as disabling a rule may lead to potential issues in your codebase.

To disable the rule, add the following comment at the top of the file where the error occurs:

// eslint-disable-next-line @typescript-eslint/no-unsafe-member-access
console.log(this.myForm.value.property);

In the above code snippet, we use the eslint-disable-next-line comment to disable the @typescript-eslint/no-unsafe-member-access rule for the specific line of code where the error occurs.

Remember to remove the comment or re-enable the rule once the issue is resolved or when it is safe to do so.

By following one of the above solutions, you should be able to fix the ESLint typedef error when accessing form.value in Angular reactive forms.

Let us know in the comments if you found this blog post helpful or if you have any other questions related to TypeScript and Angular!