Clipbaord as a clean architecture

src/content/repositories/ClipboardRepository.ts

@@ -0,0 +1,46 @@
+export default interface ClipboardRepository {
+  read(): string;
+
+  write(text: string): void;
+
+  // eslint-disable-next-line semi
+}
+
+export class ClipboardRepositoryImpl {
+  read(): string {
+    let textarea = window.document.createElement('textarea');
+    window.document.body.append(textarea);
+
+    textarea.style.position = 'fixed';
+    textarea.style.top = '-100px';
+    textarea.contentEditable = 'true';
+    textarea.focus();
+
+    let ok = window.document.execCommand('paste');
+    let value = textarea.textContent!!;
+    textarea.remove();
+
+    if (!ok) {
+      throw new Error('failed to access clipbaord');
+    }
+
+    return value;
+  }
+
+  write(text: string): void {
+    let input = window.document.createElement('input');
+    window.document.body.append(input);
+
+    input.style.position = 'fixed';
+    input.style.top = '-100px';
+    input.value = text;
+    input.select();
+
+    let ok = window.document.execCommand('copy');
+    input.remove();
+
+    if (!ok) {
+      throw new Error('failed to access clipbaord');
+    }
+  }
+}