oxc/branches-sharing-code Nursery

What it does

Checks if the if and else blocks contain shared code that can be moved out of the blocks.

Why is this bad?

Duplicate code is less maintainable. Extracting common code from branches makes the code more DRY (Don't Repeat Yourself) and easier to maintain.

Examples

Examples of incorrect code for this rule:

if (condition) {
  console.log("Hello");
  return 13;
} else {
  console.log("Hello");
  return 42;
}

if (condition) {
  doSomething();
  cleanup();
} else {
  doSomethingElse();
  cleanup();
}

Examples of correct code for this rule:

console.log("Hello");
if (condition) {
  return 13;
} else {
  return 42;
}

if (condition) {
  doSomething();
} else {
  doSomethingElse();
}
cleanup();

How to use

To enable this rule in the CLI or using the config file, you can use:

CLI

oxlint --deny oxc/branches-sharing-code

Config (.oxlintrc.json)

{
  "rules": {
    "oxc/branches-sharing-code": "error"
  }
}

References

• Rule Source