ESLint version

v10.0.0

What problem do you want to solve?

In #18485 (comment) it was agreed to deprecate the nodeType property on LintMessage and remove it in a future release (since that will be breaking change).

LintMessage#nodeType and TestCaseError#type have been deprecated in #19019, so we should probably remove these two properties in v10.

This change will have the most visible impact on the unit tests in eslint, where the deprecated properties are still found in a number of occurrences and will need to be removed, especially TestCaseError#type in rule tests.

What do you think is the correct solution?

Remove LintMessage#nodeType and TestCaseError#type in ESLint v10.

• Remove the properties and update the logic if necessary
• Update type definitions
• Update unit tests
• Test the changes with other packages, especially @eslint/markdown and @eslint/json to ensure that they will still work
• Note the breaking changes for plugin developers in the migration guide

Participation

• I am willing to submit a pull request for this change.

Additional comments

No response