Neglecting to set the lint parserOptions.project configuration to the project's tsconfig.json file following the migration to Angular

When upgrading from Angular 15 to Angular 16.2.x, I encountered the need to update devDependencies, specifically eslint from ~8.33.0 to ^8.39.0

After the migration, I ran into this error message:

You have attempted to use a lint rule that requires the TypeScript type-checker to be available, but the parserOptions.project is not configured properly in your project ESLint config file.

To resolve this, I tried:

  • disabling set rules for angular-eslint/template
  • explicitly setting ./tsconfig.json in parserOptions.project

Folder structure:

  • projectname
    • frontend
      • src
      • .eslintrc.js
      • angular.json
      • package.json
      • tsconfig.json

The migration was successful, but there seems to be a linter issue due to missing configuration, even though projects of parserOptions is set correctly.

I've tried to identify any breaking changes, but so far only the minor version has been updated.

.eslintrc.js file

(contents within .eslintrc.js file)

package.json file

(contents within package.json file)
typescripteslintangular16peer-dependenciesangular-eslint

Answer №1

In our recent project experience, we encountered a similar issue that led us to pinpoint a specific rule as the potential cause of what could be seen as an incorrect error message. Despite having a seemingly valid definition of parserOptions.project both before and after upgrading to Angular 16.

We are currently awaiting guidance from our project leaders on whether removing this rule altogether is a feasible solution.

The questionable "Bad" rule at play here is @typescript-eslint/naming-convention.

Notably, it may not be necessary to eliminate the rule entirely; simply adjusting the reporting level to "off" could suffice if you plan to revisit it later on.

Additionally, it's worth considering that other @typescript-eslint/* rules might no longer be supported in your project post-upgrade.

[Update] Following a comprehensive review of our extensive codebase and shared libraries, it was determined that deactivating any other @typescript-eslint/* rules was unnecessary.

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