unnecessaryUseStricts

Reports unnecessary "use strict" directives in ES modules and classes.

✅ This rule is included in the ts logical presets.

ES modules and class bodies are automatically in strict mode. The "use strict" directive has no effect in these contexts and is redundant.

Examples

❌ Incorrect

"use strict";

export function calculate(value: number) {
  return value * 2;
}

export class Calculator {
  add(a: number, b: number) {
    return a + b;
  }
}

✅ Correct

export function calculate(value: number) {
  return value * 2;
}

export class Calculator {
  add(a: number, b: number) {
    return a + b;
  }
}

Options

This rule is not configurable.

When Not To Use It

If you are working with non-module scripts that need to be executed in strict mode, you should not use this rule. This rule only flags "use strict" directives in ES modules (files with import or export statements).

Further Reading

• MDN: Strict mode
• MDN: JavaScript modules

Equivalents in Other Linters

• Biome: noRedundantUseStrict