typescript-eslint disable - TypeScript

As a TypeScript developer, you may have come across the typescript-eslint disable comment pragma while exploring your codebase. This pragma is used in situations where the TypeScript compiler and the ESLint linter are unable to agree on the validity of a piece of code.

In such scenarios, the typescript-eslint disable comment prevents ESLint from flagging the code as problematic, while still allowing TypeScript to compile the code without errors. This pragma is often used when migrating a codebase from JavaScript to TypeScript, as you may encounter some code that does not conform to TypeScript's static typing rules.

Here is an example of how to use the typescript-eslint disable pragma:

function add(x: number, y: number): number {
  // eslint-disable-next-line @typescript-eslint/no-unused-vars
  const unusedVariable = 'foo';
  return x + y;
}

In the above example, we have a function that accepts two parameters of type number and returns their sum. However, we also have a variable unusedVariable that is defined but never used within the function. This code will be flagged by ESLint with the warning unusedVariable is defined but never used.

To suppress this warning while still allowing TypeScript to compile the code, we can use the eslint-disable-next-line comment pragma followed by the @typescript-eslint/no-unused-vars rule identifier. This tells ESLint to ignore this specific line of code while still validating the rest of the code.

## Conclusion

In conclusion, the `typescript-eslint disable` comment pragma is a powerful tool in the TypeScript developer's toolkit, allowing for fine-grained control over the compilation and linting of your code. When used correctly, it can help you migrate your codebase to TypeScript while still maintaining some backward compatibility with your existing code.