oxlint-plugin-no-branching

Ban switch and else in Oxlint. Encourage early returns and strategy/map dispatch.

Install

npm i -D oxlint-plugin-no-branching

Oxlint Config (Explicit)

{
  "jsPlugins": ["oxlint-plugin-no-branching"],
  "rules": {
    "no-branching/no-switch": "error",
    "no-branching/no-else": "error"
  }
}

Rules

no-branching/no-switch

Errors on any SwitchStatement.

Message:

Switch statements are not allowed. Use a function with early returns or a strategy object (or a map).

no-branching/no-else

Errors on any IfStatement where alternate != null.

This bans both else {} and else if.

Message:

Else is not allowed. Use early returns or a strategy object (or a map).

Quick Examples

Fails:

switch (kind) {
  case "a":
    return 1;
  default:
    return 0;
}

if (!user) {
  return "anonymous";
} else {
  return user.name;
}

Passes:

if (!user) return "anonymous";
return user.name;

const handlers = { a: () => 1, b: () => 2 };
return (handlers[kind] ?? (() => 0))();

Local Demo

oxlint examples

You should see errors in the examples/fail-*.js files.