feat: add Symbol.dispose method

packages/pdf-viewer/src/bitmap.ts

@@ -42,4 +42,8 @@ export class Bitmap {
     this.runtime.free(bufferPtr);
     return buffer;
   }
+
+  [Symbol.dispose]() {
+    this.close();
+  }
 }

packages/pdf-viewer/src/document.ts

@@ -124,4 +124,8 @@ export class Document {
 
     return new Page(this, at, pagePtr);
   }
+
+  [Symbol.dispose]() {
+    this.close();
+  }
 }

packages/pdf-viewer/src/page.ts

@@ -186,4 +186,8 @@ export class Page {
 
     return [deviceX, deviceY];
   }
+
+  [Symbol.dispose]() {
+    this.close();
+  }
 }

packages/pdf-viewer/src/runtime.ts

@@ -77,6 +77,7 @@ export class Runtime {
    * Initialize the PDFium library and allocate global resources for it.
    */
   init = this.wasm.FPDF_InitLibraryWithConfig;
+  deinit = this.wasm.FPDF_DestroyLibrary;
 
   /**
    * Gets last error code when a function fails.

packages/pdf-viewer/src/viewer.ts

@@ -72,4 +72,8 @@ export class Viewer {
     );
     return new Bitmap(this.runtime, ptr, format);
   }
+
+  [Symbol.dispose]() {
+    this.runtime.deinit();
+  }
 }

packages/pdfium/dist/index.d.ts

@@ -14,6 +14,7 @@ export interface FPDF_Config {
  */
 export interface FPDF_Bindings {
   FPDF_InitLibraryWithConfig(config: FPDF_Config): void;
+  FPDF_DestroyLibrary(): void;
 
   FPDF_GetLastError<T extends number>(): T;