[BUG] Browser Mode extension is broken on MacOS

[n0samu]

Describe the bug
Games that use :browser-mode: fail to launch on MacOS. When clicking the Play button, nothing happens. One of the games affected is Mini Metro: London.

Expected behavior
These games should launch in a separate launcher window (Browser Mode).

Desktop (please complete the following information):

• OS: MacOS Catalina (10.15)
• Flashpoint Version: 10.1 Infinity
• Log text: INFO [21:13:44] Mini Metro: London: Mini Metro: London failed to start - spawn "/Users/nosamu/Flashpoint/Flashpoint 10.1 Infinity - Modded/Launcher/Flashpoint.app/Contents/Frameworks/Flashpoint Helper.app/Contents/MacOS/Flashpoint Helper" ENOENT

Additional context
I have verified that the Flashpoint Helper path actually exists, despite the launcher's ENOENT message.

[colin969]

Can you make sure this happens on the latest version

[LindirQuenya]

I've hunted it down: quotes are added to the filename regardless of execFile on Mac and Linux.

launcher/src/back/responses.ts

Lines 1354 to 1364 in 6d2bfc4

	switch (process.platform) {
	case 'win32':
	return execFile ? filename : `"${filename}"`; // Quotes cause issues with execFile
	case 'darwin':
	case 'linux':
	if (useWine) {
	return `wine start /wait /unix "${filename}"`;
	}
	return `"${filename}"`;
	default:
	throw Error('Unsupported platform');

I'll be changing execFile(file, args) to spawn(file, args, {'shell':false}) in an upcoming PR. I'll fix this in that too.

[n0samu]

Unfortunately, Browser Mode still seems to be broken. Here are the errors I receive now:

INFO  [15:23:44]                      (node:22878) UnhandledPromiseRejectionWarning: Error: ENOENT: no such file or directory, open 'preferences.json'
INFO  [15:23:44]                          at Object.openSync (node:fs:585:3)
INFO  [15:23:44]                          at Object.func [as openSync] (node:electron/js2c/asar_bundle:5:1812)
INFO  [15:23:44]                          at Object.readFileSync (node:fs:453:35)
INFO  [15:23:44]                          at e.readFileSync (node:electron/js2c/asar_bundle:5:9160)
INFO  [15:23:44]                          at readJsonFileSync (/Applications/Flashpoint/Flashpoint.app/Contents/Resources/app.asar/build/shared/Util.js:32:26)
INFO  [15:23:44]                          at Object.readOrCreateFileSync (/Applications/Flashpoint/Flashpoint.app/Contents/Resources/app.asar/build/shared/preferences/PreferencesFile.js:20:50)
INFO  [15:23:44]                          at startup (/Applications/Flashpoint/Flashpoint.app/Contents/Resources/app.asar/build/main/BrowserMode.js:32:57)
INFO  [15:23:44]                          at startBrowserMode (/Applications/Flashpoint/Flashpoint.app/Contents/Resources/app.asar/build/main/BrowserMode.js:22:11)
INFO  [15:23:44]                          at Object.<anonymous> (/Applications/Flashpoint/Flashpoint.app/Contents/Resources/app.asar/build/main/index.js:14:40)
INFO  [15:23:44]                          at Module._compile (node:internal/modules/cjs/loader:1118:14)
INFO  [15:23:44]                      (Use `Flashpoint Helper --trace-warnings ...` to show where the warning was created)
INFO  [15:23:44]                      (node:22878) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 2)
INFO  [15:23:45]                      [0817/152345.035417:FATAL:electron_main_delegate_mac.mm(71)] Unable to find helper app