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50 lines
1,005 B
Text
50 lines
1,005 B
Text
---
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description: 'Enforce non-null assertions over explicit type casts.'
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---
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> 🛑 This file is source code, not the primary documentation location! 🛑
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>
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> See **https://typescript-eslint.io/rules/non-nullable-type-assertion-style** for documentation.
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This rule detects when an `as` cast is doing the same job as a `!` would, and suggests fixing the code to be an `!`.
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## Rule Details
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Examples of code for this rule:
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<!--tabs-->
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### ❌ Incorrect
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```ts
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const maybe = Math.random() > 0.5 ? '' : undefined;
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const definitely = maybe as string;
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const alsoDefinitely = <string>maybe;
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```
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### ✅ Correct
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```ts
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const maybe = Math.random() > 0.5 ? '' : undefined;
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const definitely = maybe!;
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const alsoDefinitely = maybe!;
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```
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## Options
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```jsonc
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// .eslintrc.json
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{
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"rules": {
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"@typescript-eslint/non-nullable-type-assertion-style": "warn"
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}
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}
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```
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This rule is not configurable.
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## When Not To Use It
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If you don't mind having unnecessarily verbose type casts, you can avoid this rule.
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