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Rslint

    no-lonely-if

    Unreleased

    Configuration

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

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

    Rule Details

    If an if statement is the only statement in the else block, it is often clearer to use an else if form.

    if (foo) {
    // ...
} else {
    if (bar) {
        // ...
    }
}

    should be rewritten as

    if (foo) {
    // ...
} else if (bar) {
    // ...
}

    This rule disallows if statements as the only statement in else blocks.

    Examples of incorrect code for this rule:

    if (condition) {
    // ...
} else {
    if (anotherCondition) {
        // ...
    }
}

if (condition) {
    // ...
} else {
    if (anotherCondition) {
        // ...
    } else {
        // ...
    }
}

    Examples of correct code for this rule:

    if (condition) {
    // ...
} else if (anotherCondition) {
    // ...
}

if (condition) {
    // ...
} else if (anotherCondition) {
    // ...
} else {
    // ...
}

if (condition) {
    // ...
} else {
    if (anotherCondition) {
        // ...
    }
    doSomething();
}

    When Not To Use It

    Disable this rule if the code is clearer without requiring the else if form.

    Original Documentation