Question 1

How to set up eslint-plugin-expect-type in a TypeScript project?

Accepted Answer

Install the plugin via npm, ensure TypeScript and @typescript-eslint/parser are installed, then add the recommended configuration to your ESLint setup. The README provides clear examples for both modern and legacy config formats.

Question 2

eslint-plugin-expect-type vs ts-expect: which should I use?

Accepted Answer

eslint-plugin-expect-type integrates type assertions into ESLint for real-time feedback via comments, while ts-expect uses function calls in code. Choose based on whether you prefer linting-based checks or inline function assertions for type safety.

Question 3

Can I use ^? comments to see types in my editor like VS Code?

Accepted Answer

Yes, but it requires the ESLint extension in VS Code to display real-time feedback. The ^? comments leverage ESLint to show inferred types, making them useful for documentation and debugging during development.

Question 4

Does this plugin work with test runners like Jest or Vitest?

Accepted Answer

No, it's designed for linting during development, not for runtime tests. For type assertions in test files, consider tools like Vitest's built-in type assertions or libraries such as expect-type.

Question 5

What's the difference between $ExpectError and $ExpectType comments?

Accepted Answer

$ExpectError asserts that a line should produce a TypeScript error to catch unintended type changes, while $ExpectType verifies that an expression evaluates to a specific type to enforce type contracts.

Question 6

Is eslint-plugin-expect-type good for large codebases?

Accepted Answer

Yes, it scales with ESLint and provides consistent type checking, but it requires proper ESLint configuration and may add overhead if not already integrated into your workflow.

eslint-plugin-expect-type

What is eslint-plugin-expect-type?

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