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[ts-types-lang](../README.md) / [Modules](../modules.md) / [test](../modules/test.md) / Assert
# Interface: Assert<_B\>
[test](../modules/test.md).Assert
Assert a boolean expression is true
**`Throws`**
if false
**`Example`**
Here's an example checking if `SomeValue` is not equal to [1,2,3]
Uses - [Not](../modules/util.md#not), [Equals](../modules/util.md#equals)
```ts
Assert<Not<Equals<SomeValue, [1, 2, 3]>>>
```
## Type parameters
| Name | Type | Description |
| :------ | :------ | :------ |
| `_B` | extends `boolean` | The boolean value to assert |
## Hierarchy
- [`Effect`](effect.Effect.md)
↳ **`Assert`**
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