What are the benefits of combining 'eslint' and 'typescript-eslint' for TypeScript linting as opposed to just using 'tsc'?

Question

What are the benefits of combining 'eslint' and 'typescript-eslint' for TypeScript linting as opposed to just using 'tsc'?

Objective: Developing a rigorous TypeScript linter script

eslint scans for problematic JavaScript code patterns. The documentation recommends initiating eslint with npm init @eslint/config@latest

This process also installs typescript-eslint

But what is the purpose of using typescript-eslint?

As per the information on the official website, it:

enables esLint to analyze TypeScript code

However, upon removing typescript-eslint, esLint seems to function properly.

Further examination reveals that typescript-eslint fails to identify an undefined error, which is caught by tsc:

// Type "pink" is undefined
const apple: pink = 'apple'
console.log(apple)

My understanding is that tsc converts TypeScript into JavaScript unless specified with the --noEmit flag. By utilizing configurations like "strict": true, TypeScript rules can be set up for validation.

Is typescript-eslint essentially irrelevant for linting purposes?

It appears that typescript-eslint may not serve its intended function and might need to be eliminated. Meanwhile, tsc proves effective in detecting errors.

typescript eslint lint tsc typescript-eslint

Answer 1

Answer №1

It seems that removing typescript-eslint allows esLint to function properly.

When you mention it functioning normally, are you referring to its performance in your IDE (such as vscode) or when executing the eslint command? Most IDEs come with eslint integrated or offer it as a package for in-editor linting (utilizing a typescript parser behind the scenes). Without typescript-eslint, eslint is unable to parse your typescript files. Try running eslint without it to see if it works.

My understanding is that tsc compiles TypeScript to JavaScript unless the --noEmit flag is included. By setting options like "strict": true, TypeScript rules can be configured for checking.

ESLint and tsc serve different purposes.

Executing tsc detects type errors, which eslint does not do.
Running eslint identifies linting errors (breaches of defined rules) rather than type errors, something that tsc does not handle.

ESLint only flags errors from its own linters and does not signal typescript compilation issues. Read more at:

The purpose of the typescript-eslint tool is explained thoroughly here:

ESLint and TypeScript interpret code differently internally. ESLint's default JavaScript parser cannot inherently interpret TypeScript-specific syntax, and its rules lack direct access to TypeScript's type information.

Answer 2

It seems that removing typescript-eslint allows esLint to function properly.

When you mention it functioning normally, are you referring to its performance in your IDE (such as vscode) or when executing the eslint command? Most IDEs come with eslint integrated or offer it as a package for in-editor linting (utilizing a typescript parser behind the scenes). Without typescript-eslint, eslint is unable to parse your typescript files. Try running eslint without it to see if it works.

My understanding is that tsc compiles TypeScript to JavaScript unless the --noEmit flag is included. By setting options like "strict": true, TypeScript rules can be configured for checking.

ESLint and tsc serve different purposes.

Executing tsc detects type errors, which eslint does not do.
Running eslint identifies linting errors (breaches of defined rules) rather than type errors, something that tsc does not handle.

ESLint only flags errors from its own linters and does not signal typescript compilation issues. Read more at:

The purpose of the typescript-eslint tool is explained thoroughly here:

ESLint and TypeScript interpret code differently internally. ESLint's default JavaScript parser cannot inherently interpret TypeScript-specific syntax, and its rules lack direct access to TypeScript's type information.

Answer 3

Answer №2

tsc is responsible for compiling the project and identifying any build errors, like in the example you provided. ESLint, on the other hand, is utilized to detect patterns that may not be ideal. It's important to note that ESLint should be run on your code rather than on the code generated by the Typescript compiler. This is where typescript-eslint comes into play, especially when working with Typescript, as it allows ESLint to understand Typescript better, as mentioned on their homepage:

The tools that enhance ESLint and Prettier to support TypeScript.

Answer 4

tsc is responsible for compiling the project and identifying any build errors, like in the example you provided. ESLint, on the other hand, is utilized to detect patterns that may not be ideal. It's important to note that ESLint should be run on your code rather than on the code generated by the Typescript compiler. This is where typescript-eslint comes into play, especially when working with Typescript, as it allows ESLint to understand Typescript better, as mentioned on their homepage:

The tools that enhance ESLint and Prettier to support TypeScript.

What are the benefits of combining 'eslint' and 'typescript-eslint' for TypeScript linting as opposed to just using 'tsc'?

Answer №1

Answer №2

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