Function assert

assert(value: boolean, message?: string): asserts value
Asserts that a boolean is true, narrowing the type after the assertion.
Parameters
- value: boolean
  Boolean that must be true.
- Optionalmessage: string
  Optional error message when the assertion fails. Defaults to "Assertion failed".
Returns asserts value
Example
```
assert(isReady); // passes when `isReady` is true
assert(false); // throws
```
Throws
If value is false.
- Defined in assert.ts:18
assert<T>(value: T | null | undefined, message?: string): asserts value is T
Asserts that a value is present, narrowing away null and undefined.

Other falsy values such as 0 and "" pass.
Type Parameters
- T
Parameters
- value: T | null | undefined
  Value that must not be null or undefined.
- Optionalmessage: string
  Optional error message when the assertion fails. Defaults to "Assertion failed".
Returns asserts value is T
Example
```
function getName(id: number): string | undefined;

const maybeName = getName(123);
assert(maybeName, "Name is required");
const name = maybeName;
//    ^? string

assert(0); // passes
```
Throws
If value is null or undefined.
- Defined in assert.ts:39