LosaDev Tools: Lost Saga modding tools in the browser

app/src/worker/shims/child_process.js

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+// "node:child_process": a browser cannot start programs. Features that run an external exe
+// are left out of the web version; this only makes a clear error.
+function unavailable() {
+	throw new Error("Running external programs is not possible in the browser (use the desktop LS Tools for this).");
+}
+export const spawn = unavailable;
+export const spawnSync = unavailable;
+export const execFile = unavailable;
+export const execFileSync = unavailable;
+export const exec = unavailable;
+export const execSync = unavailable;
+export default { spawn, spawnSync, execFile, execFileSync, exec, execSync };

app/src/worker/shims/crypto.js

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+// node:crypto subset used by the desktop modules.
+export function randomBytes(n) {
+	const b = Buffer.alloc(n);
+	crypto.getRandomValues(b);
+	return b;
+}
+
+export function randomUUID() {
+	return crypto.randomUUID();
+}
+
+export default { randomBytes, randomUUID };

app/src/worker/shims/electron.js

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+// "electron" for the ported main-process modules. Only app.getPath is used outside the dialogs
+// (which the browser answers in src/legacy/bridge.js). userData is a virtual folder kept in the
+// browser's IndexedDB (see vfs.takePersisted / restore).
+const PATHS = { userData: "/userdata", temp: "/tmp", downloads: "/out", documents: "/out", desktop: "/out", home: "/out" };
+
+export const app = {
+	getPath: (name) => PATHS[name] || `/userdata/${name}`,
+	getVersion: () => "web",
+	isPackaged: true,
+};
+
+const unavailable = (what) => () => {
+	throw new Error(`${what} is not available in the browser`);
+};
+
+export const dialog = { showOpenDialog: unavailable("dialog"), showSaveDialog: unavailable("dialog"), showMessageBox: unavailable("dialog") };
+export const shell = { openPath: async () => "", showItemInFolder: () => {}, openExternal: async () => {} };
+export const ipcMain = { handle: () => {}, on: () => {} };
+export const BrowserWindow = class {};
+
+export default { app, dialog, shell, ipcMain, BrowserWindow };

app/src/worker/shims/fs-promises.js

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+// node:fs/promises subset. Only Pack.optimize() uses it, which belongs to the removed
+// IOP Manager; kept so the module loads, and fails clearly if anything calls it.
+export async function open() {
+	const e = new Error("Writing new files is not available in the web version");
+	e.code = "EROFS";
+	throw e;
+}
+
+export default { open };

app/src/worker/shims/os.js

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+// "node:os" subset for the ported modules.
+export const tmpdir = () => "/tmp";
+export const homedir = () => "/out";
+export const platform = () => "win32";
+export const EOL = "\r\n";
+export const cpus = () => [{}];
+export default { tmpdir, homedir, platform, EOL, cpus };

app/src/worker/shims/zlib.js

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+// node:zlib subset used by the desktop modules, on fflate.
+import { inflateSync, deflateSync } from "fflate";
+
+const TABLE = (() => {
+	const t = new Uint32Array(256);
+	for (let n = 0; n < 256; n++) {
+		let c = n;
+		for (let k = 0; k < 8; k++) c = c & 1 ? 0xedb88320 ^ (c >>> 1) : c >>> 1;
+		t[n] = c >>> 0;
+	}
+	return t;
+})();
+
+export function crc32(buf, prev = 0) {
+	let c = ~prev >>> 0;
+	for (let i = 0; i < buf.length; i++) c = TABLE[(c ^ buf[i]) & 0xff] ^ (c >>> 8);
+	return ~c >>> 0;
+}
+
+export function inflateRawSync(buf) {
+	return Buffer.from(inflateSync(buf instanceof Uint8Array ? buf : new Uint8Array(buf)));
+}
+
+export function deflateRawSync(buf, opts = {}) {
+	const level = opts.level === undefined ? 6 : opts.level;
+	return Buffer.from(deflateSync(buf instanceof Uint8Array ? buf : new Uint8Array(buf), { level }));
+}
+
+export default { crc32, inflateRawSync, deflateRawSync };