initial commit

src/monitor.ts

@@ -0,0 +1,34 @@
+import { existsSync } from "node:fs";
+import { readFile } from "node:fs/promises";
+
+async function sleep(ms: number) {
+  await new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+export async function monitorRun(input: {
+  eventsPath: string;
+  resultPath: string;
+  onEvent?: (event: any) => void;
+  pollMs?: number;
+}) {
+  const pollMs = input.pollMs ?? 50;
+  let offset = 0;
+
+  while (true) {
+    if (existsSync(input.eventsPath)) {
+      const text = await readFile(input.eventsPath, "utf8");
+      const next = text.slice(offset);
+      offset = text.length;
+
+      for (const line of next.split("\n").filter(Boolean)) {
+        input.onEvent?.(JSON.parse(line));
+      }
+    }
+
+    if (existsSync(input.resultPath)) {
+      return JSON.parse(await readFile(input.resultPath, "utf8"));
+    }
+
+    await sleep(pollMs);
+  }
+}