From a3513185ec99e4e4b5f657ad784157a7293eff45 Mon Sep 17 00:00:00 2001
From: Eli Bishop <eli@launchdarkly.com>
Date: Wed, 20 Nov 2019 11:20:09 -0800
Subject: [PATCH] Node 6 compatibility

---
 test/async_utils.js           | 11 +++++++++++
 test/file_data_source-test.js |  3 +--
 test/polling-test.js          |  3 +--
 test/requestor-test.js        |  3 +--
 4 files changed, 14 insertions(+), 6 deletions(-)

diff --git a/test/async_utils.js b/test/async_utils.js
index b1db260..a265ed2 100644
--- a/test/async_utils.js
+++ b/test/async_utils.js
@@ -1,4 +1,14 @@
 
+// Converts a function that takes a Node-style callback (err, result) as its last argument into a
+// function that returns a Promise. This is equivalent to util.promisify, but is reimplemented here
+// because promisify isn't supported in Node 6.
+// Usage: await asyncifyNode(doSomething)(allParamsExceptCallback)
+function promisify(f) {
+  return (...args) =>
+    new Promise((resolve, reject) =>
+      f(...args, (err, result) => err ? reject(err) : resolve(result)));
+}
+
 // Converts a function that takes a single-parameter callback (like most SDK methods) into a Promise.
 // This is different from util.promisify, which uses Node-style callbacks with two parameters.
 // Usage: await asyncify(callback => doSomething(params, callback))
@@ -83,6 +93,7 @@ function AsyncQueue() {
 
 module.exports = {
   asyncify,
+  promisify,
   sleepAsync,
   withCloseable,
   AsyncQueue,
diff --git a/test/file_data_source-test.js b/test/file_data_source-test.js
index db80139..2ef4c82 100644
--- a/test/file_data_source-test.js
+++ b/test/file_data_source-test.js
@@ -1,8 +1,7 @@
 const fs = require('fs');
 const tmp = require('tmp');
-const { promisify } = require('util');
 const dataKind = require('../versioned_data_kind');
-const { asyncify, sleepAsync } = require('./async_utils');
+const { asyncify, promisify, sleepAsync } = require('./async_utils');
 const { stubLogger } = require('./stubs');
 
 const LaunchDarkly = require('../index');
diff --git a/test/polling-test.js b/test/polling-test.js
index 2cdf771..e296f86 100644
--- a/test/polling-test.js
+++ b/test/polling-test.js
@@ -1,8 +1,7 @@
-const { promisify } = require('util');
 const InMemoryFeatureStore = require('../feature_store');
 const PollingProcessor = require('../polling');
 const dataKind = require('../versioned_data_kind');
-const { asyncify, sleepAsync } = require('./async_utils');
+const { asyncify, promisify, sleepAsync } = require('./async_utils');
 const stubs = require('./stubs');
 
 describe('PollingProcessor', () => {
diff --git a/test/requestor-test.js b/test/requestor-test.js
index 169e7bb..7d6c551 100644
--- a/test/requestor-test.js
+++ b/test/requestor-test.js
@@ -1,7 +1,6 @@
-import { promisify } from 'util';
 import Requestor from '../requestor';
 import * as dataKind from '../versioned_data_kind';
-import { withCloseable } from './async_utils';
+import { promisify, withCloseable } from './async_utils';
 import { createServer, respond, respondJson } from './http_server';
 
 describe('Requestor', () => {