TypeScript Type Assertions

Introduction

Example

1/* this forces a type assertion */
2const myCanvas = document.getElementById("main_canvas") as HTMLCanvasElement;
3
4// Now TypeScript knows myCanvas has canvas-specific methods

Key Points

• Use the `as` keyword to assert a type.
• It overrides TypeScript's internal guessing engine.
• It does not actually change or format the data itself.
• Only use it when you are absolutely certain of the data type.