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Rslint

    no-return-assign

    Configuration

    rslint.config.ts
    import { defineConfig, js } from '@rslint/core';

export default defineConfig([
  js.configs.recommended,
  {
    rules: {
      'no-return-assign': 'error',
    },
  },
]);

    Rule Details

    This rule aims to eliminate assignments from return statements, because it is difficult to tell whether the author intended an assignment or a mistyped comparison.

    Examples of incorrect code for this rule:

    function doSomething() {
  return foo = bar + 2;
}

function doSomethingElse() {
  return foo += 2;
}

const foo = (a, b) => a = b;

const bar = (a, b, c) => (a = b, c == b);

function doSomethingMore() {
  return foo = bar && foo > 0;
}

    Examples of correct code for this rule:

    function doSomething() {
  return foo == bar + 2;
}

function doSomethingMore() {
  return (foo = bar + 2);
}

const foo = (a, b) => (a = b);

const bar = (a, b, c) => ((a = b), c == b);

function doAnotherThing() {
  return (foo = bar) && foo > 0;
}

    Options

    This rule takes a single string option:

    • "except-parens" (default) — disallow assignments in return statements unless they are enclosed in parentheses.
    • "always" — disallow all assignments in return statements, even when parenthesised.

    Examples of incorrect code for this rule with "always":

    { "no-return-assign": ["error", "always"] }
    function doSomething() {
  return foo = bar + 2;
}

function doSomethingMore() {
  return (foo = bar + 2);
}

    Examples of correct code for this rule with "always":

    { "no-return-assign": ["error", "always"] }
    function doSomething() {
  return foo == bar + 2;
}

    Original Documentation