https://www.lunacyapp.com/js/dialog.js?v=IFVzX3KjrMZjk0fWevmFu03JAEmD_akIbIvHd0l65CM

1globalThis.dialog = (() => {
2    const openFile = async (multiple, accept) => {
3        try {
4            const element = document.getElementById("out");
5            if (element) {
6                element.focus();
7                element.dispatchEvent(new PointerEvent("pointerup", {
8                    bubbles: true,
9                    cancelable: true,
10                    pointerId: 1,
11                    isPrimary: true,
12                }));
13            }
14
15            const files = await new Promise((resolve, reject) => {
16                const input = document.createElement("input");
17                input.type = "file";
18                input.multiple = multiple;
19                input.accept = accept;
20
21                input.addEventListener("change", (event) => {
22                    resolve(Array.from(event.target.files));
23                });
24
25                input.addEventListener("cancel", () => {
26                    reject("cancel");
27                });
28
29                input.click();
30            });
31
32            for (const file of files) {
33                await globalThis.onFileSelected(file.name, new Uint8Array(await file.arrayBuffer()));
34            }
35        } catch (e) {
36            if (e !== "cancel") {
37                throw e;
38            }
39        } finally {
40            const element = document.getElementById("out");
41            if (element) {
42                element.dispatchEvent(new PointerEvent("pointerup", {
43                    bubbles: true,
44                    cancelable: true,
45                    pointerId: 1,
46                    isPrimary: true,
47                }));
48            }
49        }
50    };
51
52    const saveFile = async (name, data) => {
53        const blob = new Blob([data], {type: "application/octet-stream"});
54        const url = URL.createObjectURL(blob);
55        const a = document.createElement("a");
56        a.href = url;

57        a.download = name;
58        document.body.appendChild(a);
59        a.click();
60        document.body.removeChild(a);
61        URL.revokeObjectURL(url);
62    };
63
64    return {
65        openFile,
66        saveFile,
67    };
68})();