feat!: Support @cesium/engine.

This is a feature completely independent of `cesium` support, and has no impact on regular `cesium` users. As this is a major update, it is considered a BREAKING CHANGE.
For `@cesium/engine` users, this plugin can be used by `import cesium from 'vite-plugin-cesium-build/engine'`, and the usage is identical to `import cesium from 'vite-plugin-cesium-build'`.

Refs: #6

package.json

@@ -26,6 +26,11 @@
       "types": "./dist/cesium.d.ts",
       "import": "./dist/cesium.mjs",
       "require": "./dist/cesium.cjs"
+    },
+    "./engine": {
+      "types": "./dist/engine.d.ts",
+      "import": "./dist/engine.mjs",
+      "require": "./dist/engine.cjs"
     }
   },
   "main": "./dist/cesium.cjs",

src/core/setBaseUrl.ts

@@ -16,11 +16,7 @@ export function setBaseUrl(options: BuildCesiumOptions): Plugin {
       : () => [
           {
             tag: 'script',
-            children: `Object.defineProperty(
-              globalThis,
-              'CESIUM_BASE_URL',
-              { value: ${toUrlValue(customCesiumBaseUrl, { base, to })} }
-            )`,
+            children: `Object.defineProperty(globalThis, 'CESIUM_BASE_URL', { value: ${toUrlValue(customCesiumBaseUrl, { base, to })} })`,
           },
         ],
   }

src/engine.ts

@@ -0,0 +1,33 @@
+import type { Plugin } from 'vite'
+
+import { setBaseUrl } from './core/setBaseUrl'
+import { type BuildCesiumOptions, resolveOptions } from './core/resolveOptions'
+import { copyCesium } from './core/copyCesium'
+
+function pluginEntry(pluginOptions?: Partial<BuildCesiumOptions>): Plugin[] {
+  const options = resolveOptions(pluginOptions, 'node_modules/@cesium/engine')
+
+  return [
+    ...copyCesium(
+      options,
+      [],
+      [
+        {
+          src: `${options.from}/Source/Assets/*`,
+          dest: `${options.to}/Assets/`,
+        },
+        {
+          src: `${options.from}/Build/ThirdParty/*`,
+          dest: `${options.to}/ThirdParty/`,
+        },
+        {
+          src: `${options.from}/Build/Workers/*`,
+          dest: `${options.to}/Workers/`,
+        },
+      ],
+    ),
+    setBaseUrl(options),
+  ]
+}
+
+export default pluginEntry