close
Rslint

    no-unmodified-loop-condition

    Configuration

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

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

    Rule Details

    Disallows variables in loop conditions that are not modified inside the loop body. If a variable used in a loop's test condition is never assigned to, incremented, or decremented within the loop, it is likely a bug that leads to an infinite loop or incorrect termination.

    Conditions that contain function calls, member access expressions, new expressions, or tagged template expressions are skipped, since those may have side effects that modify the condition indirectly.

    Examples of incorrect code for this rule:

    var foo = 0;
while (foo) {
  // foo is never modified
  doSomething();
}

var bar = 0;
do {
  doSomething();
} while (bar);

for (var i = 0; i < 10; ) {
  // i is never modified, no incrementor
  doSomething();
}

    Examples of correct code for this rule:

    var foo = 0;
while (foo) {
  foo++;
}

var bar = 0;
do {
  bar = getNextValue();
} while (bar);

for (var i = 0; i < 10; i++) {
  doSomething();
}

// Function calls in condition are allowed (side effects possible)
while (hasNext()) {
  process();
}

// Member access in condition is allowed
while (obj.ready) {
  process();
}

    Original Documentation