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Casting

Cast Object as Type

Use the "as" operator. Example:

document.getElementById('name') as HTMLInputElement;

Methods

Flag Return as Non-Nullable

Add an ! after it. Example:

document.getElementById('name')!; // Must return an element or fail

Types

Array

Single Type

Example:

let test: string[];

Multi-type

Example:

test: string | number | boolean

Enum

Example:

enum Role {
  ADMIN,
  READ_ONLY,
  AUTHOR
}

Literal (only specific values)

Example:

test: 'value1' | 'value2'

Specific Values

Example:

enum Role {
  ADMIN = 5,
  READ_ONLY,
  AUTHOR = 'Author'
}

Tuple (array with a specific number of values of specific types)

Example:

let test: [number, string];

Type Aliases (Custom Types)

Example:

type MultiType = number | string;
function test(input1: MultiType) {...}