feat: add potrace converter

src/converters/potrace.ts

@@ -0,0 +1,37 @@
+import { execFile } from "node:child_process";
+
+export const properties = {
+  from: {
+    images: ["pnm", "pbm", "pgm", "bmp"],
+  },
+  to: {
+    images: ["svg", "pdf", "pdfpage", "eps", "postscript", "ps", "dxf", "geojson", "pgm", "gimppath", "xfig"],
+  },
+};
+
+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("potrace", [filePath, "-o", targetPath, "-b", convertTo], (error, stdout, stderr) => {
+        if (error) {
+          reject(`error: ${error}`);
+        }
+  
+        if (stdout) {
+          console.log(`stdout: ${stdout}`);
+        }
+  
+        if (stderr) {
+          console.error(`stderr: ${stderr}`);
+        }
+  
+        resolve("Done");
+      });
+    });
+  }