Function assert

assert(expr, msg?): asserts expr
Make an assertion, error will be thrown if expr does not have truthy value.
Parameters
- expr: unknown
  The expression to test.
- msg: string = ""
  The optional message to display if the assertion fails.
Returns asserts expr
Example: Usage
```
import { assert } from "@std/assert";

assert("hello".includes("ello")); // Doesn't throw
assert("hello".includes("world")); // Throws
```
- Defined in assert/assert.ts:19