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no-non-null-assertion

Disallows non-null assertions using the ! postfix operator.

Rule Details

Using non-null assertions cancels the benefits of the strict null-checking mode.

Examples of code for this rule:

interface Foo {
bar?: string;
}

const foo: Foo = getFoo();
const includesBaz: boolean = foo.bar!.includes('baz');

Options

// .eslintrc.json
{
"rules": {
"@typescript-eslint/no-non-null-assertion": "warn"
}
}

This rule is not configurable.

When Not To Use It

If you don't care about strict null-checking, then you will not need this rule.

Further Reading

Attributes

  • Configs:
    • ✅ Recommended
    • 🔒 Strict
  • 🔧 Fixable
  • 💭 Requires type information