up n_m

node_modules/detect-port/lib/wait-port.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const debug = require('debug')('wait-port');
+const detect = require('./detect-port');
+
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+
+async function waitPort(port, options = {}) {
+  const { retryInterval = 1000, retries = Infinity } = options;
+  let count = 1;
+
+  async function loop() {
+    debug('retries', retries, 'count', count);
+    if (count > retries) {
+      const err = new Error('retries exceeded');
+      err.retries = retries;
+      err.count = count;
+      throw err;
+    }
+    count++;
+    const freePort = await detect(port);
+    if (freePort === port) {
+      await sleep(retryInterval);
+      return loop();
+    }
+    return true;
+  }
+
+  return await loop();
+}
+
+module.exports = waitPort;