JS.TS.NON.NULLABLE.TYPE.ASSERTION.STYLE
Prefers a non-null assertion over explicit type cast when possible
This rule detects when an as cast is doing the same job as a ! would, and suggests fixing the code to be an !.
Rule Details
Examples of code for this rule:
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Incorrect
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const maybe = Math.random() > 0.5 ? '' : undefined;
const definitely = maybe as string;
const alsoDefinitely = <string>maybe;
Correct
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const maybe = Math.random() > 0.5 ? '' : undefined;
const definitely = maybe!;
const alsoDefinitely = maybe!;
Options
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// .eslintrc.json
{
"rules": {
"@typescript-eslint/non-nullable-type-assertion-style": "warn"
}
}
This rule is not configurable.
When Not To Use It
If you don't mind having unnecessarily verbose type casts, you can avoid this rule.