Phaser.js troubleshooting: Overcoming TypeScript errors

I encountered two persistent errors that I have been unable to resolve. While the application runs smoothly in Vite, it fails to transpile due to the mentioned errors outlined below:

import Phaser from "phaser";

export default class GameScene extends Phaser.Scene {
  // Game elements
  player!: Phaser.Physics.Arcade.Sprite;
  stars!: Phaser.Physics.Arcade.Group;
  bombs!: Phaser.Physics.Arcade.Group;
  platforms!: Phaser.Physics.Arcade.StaticGroup;

  // rest of the code remains the same...

In this segment of the code:

this.physics.add.overlap(
  this.player,
  this.stars,
  this.collectStar,
  undefined,
  this
);
this.physics.add.collider(
  this.player,
  this.bombs,
  this.hitBomb,
  undefined,
  this
);

The methods this.collectStar and this.hitBomb are throwing errors. The specific errors reported are:

Error: Argument of type '(player: GameObject, star: GameObject) => void' is not assignable to parameter of type 'ArcadePhysicsCallback'. Types of parameters 'player' and 'object1' are incompatible. Type 'GameObjectWithBody | Tile' is not assignable to type 'GameObject'. Type 'Tile' is missing essential properties.ts(2345) (method) GameScene.collectStar(player: Phaser.GameObjects.GameObject, star: Phaser.GameObjects.GameObject): void

and

Error: Argument of type '(player: GameObject, bomb: GameObject) => void' is not assignable to parameter of type 'ArcadePhysicsCallback'. Types of parameters 'player' and 'object1' are incompatible. Type 'GameObjectWithBody | Tile' is not compatible with 'GameObject'. Type 'Tile' lacks certain mandatory properties.ts(2345) (method) GameScene.hitBomb(player: Phaser.GameObjects.GameObject, bomb: Phaser.GameObjects.GameObject): void

Is there any guidance on rectifying these issues? Any insights or suggestions would be greatly appreciated.

PS. The full source code can be accessed via: https://github.com/michaelkolesidis/chompy-o-croc

To proceed with deployment, I have temporarily resolved the errors by inserting // @ts-ignore before each occurrence on GitHub (lines 162 and 170).

Answer №1

Upon careful examination of the warning message, it is evident that the type definition necessitates the parameter to be of type

Phaser.Types.Physics.Arcade.GameObjectWithBody | Phaser.Tilemaps.Tile
. The reason behind this requirement remains unknown (potentially due to outdated or incorrect type definitions). To address this issue, there are two possible solutions: adjusting the method signatures as follows:

 collectStar(
     player: Phaser.Types.Physics.Arcade.GameObjectWithBody | Phaser.Tilemaps.Tile,
     star: Phaser.Types.Physics.Arcade.GameObjectWithBody | Phaser.Tilemaps.Tile
 ) {
     const starSprite = star as Phaser.Physics.Arcade.Sprite;
     ...
 } 

Alternatively:

collectStar(player: any, star: any) {
    const starSprite = star as Phaser.Physics.Arcade.Sprite;
    ...
} 

...as you are ultimately casting the gameobject to the correct type regardless.

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