fix: add libheif

issue #202

src/converters/libheif.ts

@@ -0,0 +1,52 @@
+import { execFile } from "child_process";
+
+export const properties = {
+  from: {
+    images: [
+      "avci",
+      "avcs",
+      "avif",
+      "h264",
+      "heic",
+      "heics",
+      "heif",
+      "heifs",
+      "mkv",
+      "mp4",
+    ],
+  },
+  to: {
+    images: ["jpeg", "png", "y4m"],
+  },
+};
+
+export function convert(
+  filePath: string,
+  fileType: string,
+  convertTo: string,
+  targetPath: string,
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  options?: unknown,
+): Promise<string> {
+  return new Promise((resolve, reject) => {
+    execFile(
+      "heif-convert",
+      [filePath, targetPath],
+      (error, stdout, stderr) => {
+        if (error) {
+          reject(`error: ${error}`);
+        }
+
+        if (stdout) {
+          console.log(`stdout: ${stdout}`);
+        }
+
+        if (stderr) {
+          console.error(`stderr: ${stderr}`);
+        }
+
+        resolve("Done");
+      },
+    );
+  });
+}