Migrate cesium-compass to typescript

[fredj]

No description provided.

[Copilot]

Pull Request Overview

This PR migrates the cesium-compass package from JavaScript with JSDoc type annotations to TypeScript with decorators. The migration modernizes the build configuration and code structure to use native TypeScript features instead of JavaScript with type comments.

• Converts the main component file from JavaScript to TypeScript
• Replaces JSDoc type annotations with TypeScript types and interfaces
• Migrates from static get properties() to decorator-based property definitions using @property and @state

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tsconfig.json	Updated TypeScript configuration with ES2021 target, added lib options, and enabled experimental decorators
packages/cesium-compass/tsconfig.json	Added package-specific TypeScript configuration with decorator support
packages/cesium-compass/package.json	Added "type": "module", defined source file, and added build script
packages/cesium-compass/cesium-compass.ts	Converted from JSDoc to TypeScript with decorators, added type annotations and interfaces
demos/cesium-compass.html	Updated demo to load TypeScript source file instead of compiled JavaScript

Comments suppressed due to low confidence (2)

packages/cesium-compass/cesium-compass.ts:158

• Debug console.log statement should be removed before merging to production.
  packages/cesium-compass/cesium-compass.ts:50
• The FIXME comment suggests uncertainty about the initial value. Since this is a TypeScript migration, the type should be either boolean (initialized to false) or boolean | undefined if undefined is a valid state. The comment should be resolved or removed.

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[Copilot]

The demo is loading the TypeScript source file directly. This will only work in development with a transpiler. For a production demo, this should load the compiled JavaScript file (cesium-compass.js) as defined in package.json's 'main' field.

Suggested change

	<script src="../packages/cesium-compass/cesium-compass.ts" type="module"></script>
	<script src="../packages/cesium-compass/cesium-compass.js" type="module"></script>