consecutiveNonNullAssertions

Reports unnecessary extra non-null assertions.

✅ This rule is included in the ts logical preset.

The non-null assertion operator (!) is used to assert that a value is not null or undefined. Using it multiple times in a row does not do anything, and just takes up space unnecessarily.

Examples

❌ Incorrect

declare const value: string | null;

value!!.toUpperCase();

✅ Correct

declare const value: string | null;

value!.toUpperCase();

Options

This rule is not configurable.

When Not To Use It

There are no situations where it is beneficial to include extra chains of !!s.

Equivalents in Other Linters

• Biome: noExtraNonNullAssertion
• Deno: no-extra-non-null-assertion
• ESLint: @typescript-eslint/no-extra-non-null-assertion
• Oxlint: typescript/no-extra-non-null-assertion