consistent-return

Require return statements to either always or never specify values.

💭

This rule requires type information to run.

This rule extends the base eslint/consistent-return rule. This version adds support for functions that return void or Promise<void>.

❌ Incorrect

function foo(): undefined {}
function bar(flag: boolean): undefined {
  if (flag) return foo();
  return;
}

async function baz(flag: boolean): Promise<undefined> {
  if (flag) return;
  return foo();
}

Open in Playground

✅ Correct

function foo(): void {}
function bar(flag: boolean): void {
  if (flag) return foo();
  return;
}

async function baz(flag: boolean): Promise<void | number> {
  if (flag) return 42;
  return;
}

Open in Playground

Options

See eslint/consistent-return options.

How to Use

.eslintrc.cjs

module.exports = {
  "rules": {
    // Note: you must disable the base rule as it can report incorrect errors
    "consistent-return": "off",
    "@typescript-eslint/consistent-return": "error"
  }
};

Try this rule in the playground ↗

When Not To Use It

Type checked lint rules are more powerful than traditional lint rules, but also require configuring type checked linting. See Performance Troubleshooting if you experience performance degredations after enabling type checked rules.

Resources

• Rule source
• Test source

^{Taken with ❤️ from ESLint core}