export type CopyDocument = {

readonly body: HTMLElement;

readonly createElement: (tagName: "textarea") => HTMLTextAreaElement;

readonly execCommand?: (command: string) => boolean;

};

type CopyTextOptions = {

readonly clipboard?: Pick<Clipboard, "writeText">;

readonly document?: CopyDocument;

};

export async function copyText(

text: string,

options: CopyTextOptions = {},

): Promise<boolean> {

if (options.clipboard) {

try {

await options.clipboard.writeText(text);

return true;

} catch {

// Continue to the synchronous fallback supported by older WebViews.

}

}

const target = options.document ?? document;

const textarea = target.createElement("textarea") as HTMLTextAreaElement;

textarea.value = text;

textarea.readOnly = true;

textarea.style.position = "fixed";

textarea.style.opacity = "0";

target.body.appendChild(textarea);

textarea.focus();

textarea.select();

textarea.setSelectionRange(0, textarea.value.length);

try {

return target.execCommand?.("copy") === true;

} catch {

return false;

} finally {

textarea.remove();

}

}