move index script

index.js

@@ -0,0 +1,52 @@
+const { cleanup, importCost, Lang } = require("import-cost");
+
+process.stdin.setEncoding("utf8");
+
+const receive = async () => {
+  let result = "";
+
+  for await (const chunk of process.stdin) result += chunk;
+
+  return result;
+};
+
+// Pad data with '|' for combined chunks to be parsable
+const give = (data) =>
+  process.nextTick(() => process.stdout.write(`${JSON.stringify(data)}|`));
+
+const init = async () => {
+  const [path, filetype] = process.argv.slice(2);
+  const lang =
+    filetype.substring(0, "typescript".length) === "typescript"
+      ? Lang.TYPESCRIPT
+      : Lang.JAVASCRIPT;
+  const contents = await receive();
+
+  const emitter = importCost(path, contents, lang);
+
+  emitter.on("error", (error) => {
+    give({ type: "error", error });
+
+    cleanup();
+  });
+
+  emitter.on("calculated", ({ line, string, size, gzip }) => {
+    give({
+      type: "calculated",
+      data: { line, string, size, gzip },
+    });
+  });
+
+  // Send done to ensure job stdin stays open
+  emitter.on("done", (_) => {
+    give({
+      type: "done",
+    });
+
+    cleanup();
+  });
+};
+
+try {
+  init();
+} catch {}