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node_modules/stoppable/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2017 Hunter Loftis <hunter@hunterloftis.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

node_modules/stoppable/lib/stoppable.js

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+'use strict'
+
+const https = require('https')
+
+module.exports = (server, grace) => {
+  grace = typeof grace === 'undefined' ? Infinity : grace
+  const reqsPerSocket = new Map()
+  let stopped = false
+  let gracefully = true
+
+  if (server instanceof https.Server) {
+    server.on('secureConnection', onConnection)
+  } else {
+    server.on('connection', onConnection)
+  }
+
+  server.on('request', onRequest)
+  server.stop = stop
+  server._pendingSockets = reqsPerSocket
+  return server
+
+  function onConnection (socket) {
+    reqsPerSocket.set(socket, 0)
+    socket.once('close', () => reqsPerSocket.delete(socket))
+  }
+
+  function onRequest (req, res) {
+    reqsPerSocket.set(req.socket, reqsPerSocket.get(req.socket) + 1)
+    res.once('finish', () => {
+      const pending = reqsPerSocket.get(req.socket) - 1
+      reqsPerSocket.set(req.socket, pending)
+      if (stopped && pending === 0) {
+        req.socket.end()
+      }
+    })
+  }
+
+  function stop (callback) {
+    // allow request handlers to update state before we act on that state
+    setImmediate(() => {
+      stopped = true
+      if (grace < Infinity) {
+        setTimeout(destroyAll, grace).unref()
+      }
+      server.close(e => {
+        if (callback) {
+          callback(e, gracefully)
+        }
+      })
+      reqsPerSocket.forEach(endIfIdle)
+    })
+  }
+
+  function endIfIdle (requests, socket) {
+    if (requests === 0) socket.end()
+  }
+
+  function destroyAll () {
+    gracefully = false
+    reqsPerSocket.forEach((reqs, socket) => socket.end())
+    setImmediate(() => {
+      reqsPerSocket.forEach((reqs, socket) => socket.destroy())
+    })
+  }
+}

node_modules/stoppable/package.json

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+{
+  "name": "stoppable",
+  "version": "1.1.0",
+  "engines": {
+    "node": ">=4",
+    "npm": ">=6"
+  },
+  "keywords": [
+    "server",
+    "net",
+    "connect",
+    "socket",
+    "connection",
+    "stop",
+    "close",
+    "disconnect",
+    "disconnection",
+    "http",
+    "https",
+    "tcp"
+  ],
+  "files": [
+    "lib"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/hunterloftis/stoppable.git"
+  },
+  "homepage": "https://github.com/hunterloftis/stoppable",
+  "scripts": {
+    "lint": "standard --fix \"lib/**/*.js\" \"test/**/*.js\"",
+    "spec": "nyc --check-coverage mocha --bail \"test/*.test.js\"",
+    "test": "npm run lint && npm audit && npm run spec",
+    "coverage": "nyc mocha --bail \"test/*.test.js\"",
+    "perf:baseline": "node test/performance.js & sleep 2 && artillery quick -d 10 -r 1000 -o /dev/null -k http://localhost:8000",
+    "perf:stoppable": "node test/performance.js 1 & sleep 2 && artillery quick -d 10 -r 1000 -o /dev/null -k http://localhost:8000"
+  },
+  "main": "lib/stoppable.js",
+  "license": "MIT",
+  "devDependencies": {
+    "artillery": "^1.6.0-15",
+    "awaiting": "^3.0.0",
+    "chai": "^4.1.2",
+    "mocha": "^5.0.5",
+    "nyc": "^11.6.0",
+    "requisition": "^1.7.0",
+    "standard": "^11.0.1"
+  }
+}

node_modules/stoppable/readme.md

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+# Stoppable
+
+[![Build Status](https://travis-ci.org/hunterloftis/stoppable.svg?branch=master)](https://travis-ci.org/hunterloftis/stoppable)
+
+> Node's `server.close()` the way you probably [expected it to work by default](https://github.com/nodejs/node/issues/2642).
+
+## Summary
+
+```js
+const server = stoppable(http.createServer(handler))
+server.stop()
+```
+
+Stoppable stops accepting new connections and closes existing, idle connections (including keep-alives)
+without killing requests that are in-flight.
+
+## Requirements
+
+- Node.js v6+
+
+Node.js v4.x is *unofficially* supported.
+
+## Installation
+
+```bash
+yarn add stoppable
+```
+
+(or use npm)
+
+## Usage
+
+**constructor**
+
+```js
+stoppable(server, grace)
+```
+
+Decorates the server instance with a `stop` method.
+Returns the server instance, so can be chained, or can be run as a standalone statement.
+
+- server: Any HTTP or HTTPS Server instance
+- grace: Milliseconds to wait before force-closing connections
+
+`grace` defaults to Infinity (don't force-close).
+If you want to immediately kill all sockets you can use a grace of 0.
+
+**stop()**
+
+```js
+server.stop(callback)
+```
+
+Closes the server.
+
+- callback: passed along to the existing `server.close` function to auto-register a 'close' event.
+The first agrument is an error, and the second argument is a boolean that indicates whether it stopped gracefully.
+
+## Design decisions
+
+- Monkey patching generally sucks, but in this case it's the nicest API. Let's call it "decorating."
+- `grace` could be specified on `stop`, but it's better to match the existing `server.close` API.
+- Clients should be handled respectfully, so we aren't just destroying sockets, we're sending `FIN` packets first.
+- Any solution to this problem requires bookkeeping on every connection and request/response.
+We're doing a minimum of work on these "hot" code paths and delaying as much as possible to the actual `stop` method.
+
+## Performance
+
+There's no way to provide this functionality without bookkeeping on connection, disconnection, request, and response.
+However, Stoppable strives to do minimal work in hot code paths and to use optimal data structures.
+
+I'd be interested to see real-world performance benchmarks;
+the simple loopback artillery benchmark included in the lib shows very little overhead from using a stoppable server:
+
+### Without Stoppable
+
+```plain
+  Scenarios launched:  10000
+  Scenarios completed: 10000
+  Requests completed:  10000
+  RPS sent: 939.85
+  Request latency:
+    min: 0.5
+    max: 51.3
+    median: 2.1
+    p95: 3.7
+    p99: 15.3
+  Scenario duration:
+    min: 1
+    max: 60.7
+    median: 3.6
+    p95: 7.6
+    p99: 19
+  Scenario counts:
+    0: 10000 (100%)
+  Codes:
+    200: 10000
+```
+
+### With Stoppable
+
+```plain
+  Scenarios launched:  10000
+  Scenarios completed: 10000
+  Requests completed:  10000
+  RPS sent: 940.73
+  Request latency:
+    min: 0.5
+    max: 43.4
+    median: 2.1
+    p95: 3.8
+    p99: 15.5
+  Scenario duration:
+    min: 1.1
+    max: 57
+    median: 3.7
+    p95: 8
+    p99: 19.4
+  Scenario counts:
+    0: 10000 (100%)
+  Codes:
+    200: 10000
+```
+
+## License
+
+MIT