no-unnecessary-parameter-property-assignment

Disallow unnecessary assignment of constructor property parameter.

TypeScript's parameter properties allow creating and initializing a member in one place. Therefore, in most cases, it is not necessary to assign parameter properties of the same name to members within a constructor.

.eslintrc.cjs

module.exports = {
  "rules": {
    "@typescript-eslint/no-unnecessary-parameter-property-assignment": "error"
  }
};

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Examples

❌ Incorrect

class Foo {
  constructor(public bar: string) {
    this.bar = bar;
  }
}

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✅ Correct

class Foo {
  constructor(public bar: string) {}
}

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Options

This rule is not configurable.

When Not To Use It

If you don't use parameter properties, you can ignore this rule.

Resources

• Rule source
• Test source