separate preload util from main

src/api/heicConvert.ts

@@ -1,5 +1,5 @@
 import { ipcRenderer } from 'electron/renderer';
-import { isPlatformMac } from '../utils/main';
+import { isPlatformMac } from '../utils/preload';
 
 export async function convertHEIC(fileData: Uint8Array): Promise<Uint8Array> {
     if (!isPlatformMac()) {

src/preload.ts

@@ -35,7 +35,6 @@ import {
 import { selectRootDirectory, logToDisk } from './api/common';
 import { fixHotReloadNext12 } from './utils/preload';
 import { isFolder, getDirFiles } from './api/fs';
-
 import { convertHEIC } from './api/heicConvert';
 
 fixHotReloadNext12();

src/utils/preload.ts

@@ -14,3 +14,11 @@ export const fixHotReloadNext12 = () => {
     })
   });`);
 };
+
+export function isPlatformMac() {
+    return process.platform === 'darwin';
+}
+
+export function isPlatformWindows() {
+    return process.platform === 'win32';
+}