implement convertHEIC using native sips

src/services/heicConversion.ts

@@ -0,0 +1,21 @@
+import { exec } from 'child_process';
+import { app } from 'electron';
+import path from 'path';
+import { readFile, writeFile } from 'promise-fs';
+import { nanoid } from 'nanoid';
+
+export async function convertHEIC(
+    heicFileData: Uint8Array
+): Promise<Uint8Array> {
+    const tempInputFileName = nanoid() + '.heic';
+    const tempInputOutputName = nanoid() + '.jpeg';
+    const tempDir = app.getPath('temp');
+    writeFile(path.join(tempDir, tempInputFileName), heicFileData);
+    exec(
+        `sips -s format jpeg ${tempInputFileName} --out ${tempInputOutputName}`
+    );
+    const convertedFileData = new Uint8Array(
+        await readFile(tempInputOutputName)
+    );
+    return convertedFileData;
+}