Add frontend 2.0

frontend/src/lib/covergen.ts

@@ -0,0 +1,51 @@
+interface CoverArgs {
+  customer: string;
+  number: string;
+  numberPrefix?: string;
+  hlColor?: string;
+}
+
+interface CoverError {
+  error: string;
+}
+
+declare global {
+  interface Window {
+    generateCover(args: CoverArgs): Uint8Array | CoverError;
+
+    generateSplitCover(
+      args: CoverArgs
+    ): { front: Uint8Array; back: Uint8Array } | CoverError;
+  }
+}
+
+const go = new Go();
+WebAssembly.instantiateStreaming(fetch('covergen.wasm'), go.importObject).then(
+  (result) => {
+    go.run(result.instance);
+  }
+);
+
+export function generateCover(args: CoverArgs): File {
+  const result = window.generateCover(args);
+  if ('error' in result) {
+    throw result.error;
+  }
+
+  return new File([result], 'cover.pdf', { type: 'application/pdf' });
+}
+
+export function generateSplitCover(args: CoverArgs): {
+  front: File;
+  back: File;
+} {
+  const result = window.generateSplitCover(args);
+  if ('error' in result) {
+    throw result.error;
+  }
+
+  return {
+    front: new File([result.front], 'front.pdf', { type: 'application/pdf' }),
+    back: new File([result.back], 'back.pdf', { type: 'application/pdf' }),
+  };
+}