function showOpenFilePickerPolyfill(options) { return new Promise((resolve) => { const input = document.createElement("input"); input.type = "file"; input.multiple = options.multiple; input.accept = options.types .map((type) => type.accept) .flatMap((inst) => Object.keys(inst).flatMap((key) => inst[key])) .join(","); input.addEventListener("change", () => { resolve( [...input.files].map((file) => { return { getFile: async () => new Promise((resolve) => { resolve(file); }), }; }) ); }); input.click(); }); } if (typeof window.showOpenFilePicker !== 'function') { window.showOpenFilePicker = showOpenFilePickerPolyfill }