├── .gitignore
├── health-check.sh
├── healthcheck.sh
├── index.js
├── package-lock.json
└── package.json


/.gitignore:
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1 | node_modules
2 | 


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/health-check.sh:
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1 | while true; do date && curl -m 5 http://localhost:1337/healthcheck; sleep 1; done
2 | 


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/healthcheck.sh:
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1 | while true; do date && curl -m 5 http://localhost:1337/healthcheck && echo; sleep 1; done
2 | 


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/index.js:
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  1 | const express = require('express');
  2 | const crypto = require('crypto');
  3 | 
  4 | const PID = process.pid;
  5 | 
  6 | function log(msg) {
  7 |   console.log(`[${PID}]` ,new Date(), msg);
  8 | }
  9 | 
 10 | function randomString() {
 11 |   return crypto.randomBytes(100).toString('hex');
 12 | }
 13 | 
 14 | const app = express();
 15 | app.get('/healthcheck', function healthcheck(req, res) {
 16 |   log('they check my health');
 17 |   res.send('all good!\n')
 18 | });
 19 | 
 20 | 
 21 | app.get('/compute-sync', function computeSync(req, res) {
 22 |   log('computing sync!');
 23 |   const hash = crypto.createHash('sha256');
 24 |   for (let i=0; i < 10e6; i++) {
 25 |     hash.update(randomString())
 26 |   }
 27 |   res.send(hash.digest('hex') + '\n');
 28 | });
 29 | 
 30 | app.get('/compute-async', async function computeAsync(req, res) {
 31 |   log('computing async!');
 32 | 
 33 |   const hash = crypto.createHash('sha256');
 34 | 
 35 |   const asyncUpdate = async () => hash.update(randomString());
 36 | 
 37 |   for (let i = 0; i < 10e6; i++) {
 38 |     await asyncUpdate();
 39 |   }
 40 |   res.send(hash.digest('hex') + '\n');
 41 | });
 42 | 
 43 | app.get('/compute-with-promises', function computeWPromises(req, res) {
 44 |   log('computing with promises!');
 45 | 
 46 |   const hash = crypto.createHash('sha256');
 47 | 
 48 |   const updatePromise = () => new Promise((resolve) =>{
 49 |      hash.update(randomString())
 50 |      resolve();
 51 |   });
 52 | 
 53 |   let i = 0;
 54 | 
 55 |   const loop = () => {
 56 |     if (i < 10e6) {
 57 |       i++;
 58 |       updatePromise().then(loop);
 59 |     } else {
 60 |       res.send(hash.digest('hex') + '\n');
 61 |     }
 62 |   }
 63 | 
 64 |   loop();
 65 | });
 66 | 
 67 | app.get('/compute-with-set-timeout', async function computeWSetTimeout (req, res) {
 68 |   log('computing async with setTimeout!');
 69 | 
 70 |   function setTimeoutPromise(delay) {
 71 |     return new Promise((resolve) => {
 72 |       setTimeout(() => resolve(), delay);
 73 |     });
 74 |   }
 75 | 
 76 |   const hash = crypto.createHash('sha256');
 77 |   for (let i = 0; i < 10e6; i++) {
 78 |     hash.update(randomString());
 79 |     await setTimeoutPromise(0);
 80 |   }
 81 |   res.send(hash.digest('hex') + '\n');
 82 | });
 83 | 
 84 | app.get('/compute-with-set-immediate', async function computeWSetImmediate(req, res) {
 85 |   log('computing async with setImmidiate!');
 86 | 
 87 |   function setImmediatePromise() {
 88 |     return new Promise((resolve) => {
 89 |       setImmediate(() => resolve());
 90 |     });
 91 |   }
 92 | 
 93 |   const hash = crypto.createHash('sha256');
 94 |   for (let i = 0; i < 10e6; i++) {
 95 |     hash.update(randomString());
 96 |     await setImmediatePromise()
 97 |   }
 98 |   res.send(hash.digest('hex') + '\n');
 99 | });
100 | 
101 | app.get('/compute-with-next-tick', async function computeWNextTick (req, res) {
102 |   log('computing async with nextTick!');
103 | 
104 |   function nextTickPromise() {
105 |     return new Promise((resolve) => {
106 |       process.nextTick(() => resolve());
107 |     });
108 |   }
109 | 
110 |   const hash = crypto.createHash('sha256');
111 |   for (let i = 0; i < 10e6; i++) {
112 |     hash.update(randomString());
113 |     await nextTickPromise()
114 |   }
115 |   res.send(hash.digest('hex') + '\n');
116 | });
117 | 
118 | const PORT = process.env.PORT || 1337;
119 | let server = app.listen(PORT, () => log('server listening on :' + PORT));
120 | server.setTimeout(5 * 60 * 1000);
121 | 


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/package-lock.json:
--------------------------------------------------------------------------------
  1 | {
  2 |   "name": "node-async-block",
  3 |   "version": "0.0.1",
  4 |   "lockfileVersion": 1,
  5 |   "requires": true,
  6 |   "dependencies": {
  7 |     "accepts": {
  8 |       "version": "1.3.5",
  9 |       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.5.tgz",
 10 |       "integrity": "sha1-63d99gEXI6OxTopywIBcjoZ0a9I=",
 11 |       "requires": {
 12 |         "mime-types": "~2.1.18",
 13 |         "negotiator": "0.6.1"
 14 |       }
 15 |     },
 16 |     "array-flatten": {
 17 |       "version": "1.1.1",
 18 |       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
 19 |       "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
 20 |     },
 21 |     "body-parser": {
 22 |       "version": "1.18.2",
 23 |       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.18.2.tgz",
 24 |       "integrity": "sha1-h2eKGdhLR9hZuDGZvVm84iKxBFQ=",
 25 |       "requires": {
 26 |         "bytes": "3.0.0",
 27 |         "content-type": "~1.0.4",
 28 |         "debug": "2.6.9",
 29 |         "depd": "~1.1.1",
 30 |         "http-errors": "~1.6.2",
 31 |         "iconv-lite": "0.4.19",
 32 |         "on-finished": "~2.3.0",
 33 |         "qs": "6.5.1",
 34 |         "raw-body": "2.3.2",
 35 |         "type-is": "~1.6.15"
 36 |       }
 37 |     },
 38 |     "bytes": {
 39 |       "version": "3.0.0",
 40 |       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.0.0.tgz",
 41 |       "integrity": "sha1-0ygVQE1olpn4Wk6k+odV3ROpYEg="
 42 |     },
 43 |     "content-disposition": {
 44 |       "version": "0.5.2",
 45 |       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.2.tgz",
 46 |       "integrity": "sha1-DPaLud318r55YcOoUXjLhdunjLQ="
 47 |     },
 48 |     "content-type": {
 49 |       "version": "1.0.4",
 50 |       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.4.tgz",
 51 |       "integrity": "sha512-hIP3EEPs8tB9AT1L+NUqtwOAps4mk2Zob89MWXMHjHWg9milF/j4osnnQLXBCBFBk/tvIG/tUc9mOUJiPBhPXA=="
 52 |     },
 53 |     "cookie": {
 54 |       "version": "0.3.1",
 55 |       "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.3.1.tgz",
 56 |       "integrity": "sha1-5+Ch+e9DtMi6klxcWpboBtFoc7s="
 57 |     },
 58 |     "cookie-signature": {
 59 |       "version": "1.0.6",
 60 |       "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
 61 |       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
 62 |     },
 63 |     "debug": {
 64 |       "version": "2.6.9",
 65 |       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
 66 |       "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
 67 |       "requires": {
 68 |         "ms": "2.0.0"
 69 |       }
 70 |     },
 71 |     "depd": {
 72 |       "version": "1.1.2",
 73 |       "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.2.tgz",
 74 |       "integrity": "sha1-m81S4UwJd2PnSbJ0xDRu0uVgtak="
 75 |     },
 76 |     "destroy": {
 77 |       "version": "1.0.4",
 78 |       "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.0.4.tgz",
 79 |       "integrity": "sha1-l4hXRCxEdJ5CBmE+N5RiBYJqvYA="
 80 |     },
 81 |     "ee-first": {
 82 |       "version": "1.1.1",
 83 |       "resolved": "https://registry.npmjs.org/ee-first/-/ee-first-1.1.1.tgz",
 84 |       "integrity": "sha1-WQxhFWsK4vTwJVcyoViyZrxWsh0="
 85 |     },
 86 |     "encodeurl": {
 87 |       "version": "1.0.2",
 88 |       "resolved": "https://registry.npmjs.org/encodeurl/-/encodeurl-1.0.2.tgz",
 89 |       "integrity": "sha1-rT/0yG7C0CkyL1oCw6mmBslbP1k="
 90 |     },
 91 |     "escape-html": {
 92 |       "version": "1.0.3",
 93 |       "resolved": "https://registry.npmjs.org/escape-html/-/escape-html-1.0.3.tgz",
 94 |       "integrity": "sha1-Aljq5NPQwJdN4cFpGI7wBR0dGYg="
 95 |     },
 96 |     "etag": {
 97 |       "version": "1.8.1",
 98 |       "resolved": "https://registry.npmjs.org/etag/-/etag-1.8.1.tgz",
 99 |       "integrity": "sha1-Qa4u62XvpiJorr/qg6x9eSmbCIc="
100 |     },
101 |     "express": {
102 |       "version": "4.16.3",
103 |       "resolved": "http://registry.npmjs.org/express/-/express-4.16.3.tgz",
104 |       "integrity": "sha1-avilAjUNsyRuzEvs9rWjTSL37VM=",
105 |       "requires": {
106 |         "accepts": "~1.3.5",
107 |         "array-flatten": "1.1.1",
108 |         "body-parser": "1.18.2",
109 |         "content-disposition": "0.5.2",
110 |         "content-type": "~1.0.4",
111 |         "cookie": "0.3.1",
112 |         "cookie-signature": "1.0.6",
113 |         "debug": "2.6.9",
114 |         "depd": "~1.1.2",
115 |         "encodeurl": "~1.0.2",
116 |         "escape-html": "~1.0.3",
117 |         "etag": "~1.8.1",
118 |         "finalhandler": "1.1.1",
119 |         "fresh": "0.5.2",
120 |         "merge-descriptors": "1.0.1",
121 |         "methods": "~1.1.2",
122 |         "on-finished": "~2.3.0",
123 |         "parseurl": "~1.3.2",
124 |         "path-to-regexp": "0.1.7",
125 |         "proxy-addr": "~2.0.3",
126 |         "qs": "6.5.1",
127 |         "range-parser": "~1.2.0",
128 |         "safe-buffer": "5.1.1",
129 |         "send": "0.16.2",
130 |         "serve-static": "1.13.2",
131 |         "setprototypeof": "1.1.0",
132 |         "statuses": "~1.4.0",
133 |         "type-is": "~1.6.16",
134 |         "utils-merge": "1.0.1",
135 |         "vary": "~1.1.2"
136 |       }
137 |     },
138 |     "finalhandler": {
139 |       "version": "1.1.1",
140 |       "resolved": "https://registry.npmjs.org/finalhandler/-/finalhandler-1.1.1.tgz",
141 |       "integrity": "sha512-Y1GUDo39ez4aHAw7MysnUD5JzYX+WaIj8I57kO3aEPT1fFRL4sr7mjei97FgnwhAyyzRYmQZaTHb2+9uZ1dPtg==",
142 |       "requires": {
143 |         "debug": "2.6.9",
144 |         "encodeurl": "~1.0.2",
145 |         "escape-html": "~1.0.3",
146 |         "on-finished": "~2.3.0",
147 |         "parseurl": "~1.3.2",
148 |         "statuses": "~1.4.0",
149 |         "unpipe": "~1.0.0"
150 |       }
151 |     },
152 |     "forwarded": {
153 |       "version": "0.1.2",
154 |       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
155 |       "integrity": "sha1-mMI9qxF1ZXuMBXPozszZGw/xjIQ="
156 |     },
157 |     "fresh": {
158 |       "version": "0.5.2",
159 |       "resolved": "https://registry.npmjs.org/fresh/-/fresh-0.5.2.tgz",
160 |       "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
161 |     },
162 |     "http-errors": {
163 |       "version": "1.6.3",
164 |       "resolved": "http://registry.npmjs.org/http-errors/-/http-errors-1.6.3.tgz",
165 |       "integrity": "sha1-i1VoC7S+KDoLW/TqLjhYC+HZMg0=",
166 |       "requires": {
167 |         "depd": "~1.1.2",
168 |         "inherits": "2.0.3",
169 |         "setprototypeof": "1.1.0",
170 |         "statuses": ">= 1.4.0 < 2"
171 |       }
172 |     },
173 |     "iconv-lite": {
174 |       "version": "0.4.19",
175 |       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.19.tgz",
176 |       "integrity": "sha512-oTZqweIP51xaGPI4uPa56/Pri/480R+mo7SeU+YETByQNhDG55ycFyNLIgta9vXhILrxXDmF7ZGhqZIcuN0gJQ=="
177 |     },
178 |     "inherits": {
179 |       "version": "2.0.3",
180 |       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
181 |       "integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
182 |     },
183 |     "ipaddr.js": {
184 |       "version": "1.8.0",
185 |       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.8.0.tgz",
186 |       "integrity": "sha1-6qM9bd16zo9/b+DJygRA5wZzix4="
187 |     },
188 |     "media-typer": {
189 |       "version": "0.3.0",
190 |       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
191 |       "integrity": "sha1-hxDXrwqmJvj/+hzgAWhUUmMlV0g="
192 |     },
193 |     "merge-descriptors": {
194 |       "version": "1.0.1",
195 |       "resolved": "https://registry.npmjs.org/merge-descriptors/-/merge-descriptors-1.0.1.tgz",
196 |       "integrity": "sha1-sAqqVW3YtEVoFQ7J0blT8/kMu2E="
197 |     },
198 |     "methods": {
199 |       "version": "1.1.2",
200 |       "resolved": "https://registry.npmjs.org/methods/-/methods-1.1.2.tgz",
201 |       "integrity": "sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4="
202 |     },
203 |     "mime": {
204 |       "version": "1.4.1",
205 |       "resolved": "https://registry.npmjs.org/mime/-/mime-1.4.1.tgz",
206 |       "integrity": "sha512-KI1+qOZu5DcW6wayYHSzR/tXKCDC5Om4s1z2QJjDULzLcmf3DvzS7oluY4HCTrc+9FiKmWUgeNLg7W3uIQvxtQ=="
207 |     },
208 |     "mime-db": {
209 |       "version": "1.36.0",
210 |       "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.36.0.tgz",
211 |       "integrity": "sha512-L+xvyD9MkoYMXb1jAmzI/lWYAxAMCPvIBSWur0PZ5nOf5euahRLVqH//FKW9mWp2lkqUgYiXPgkzfMUFi4zVDw=="
212 |     },
213 |     "mime-types": {
214 |       "version": "2.1.20",
215 |       "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.20.tgz",
216 |       "integrity": "sha512-HrkrPaP9vGuWbLK1B1FfgAkbqNjIuy4eHlIYnFi7kamZyLLrGlo2mpcx0bBmNpKqBtYtAfGbodDddIgddSJC2A==",
217 |       "requires": {
218 |         "mime-db": "~1.36.0"
219 |       }
220 |     },
221 |     "ms": {
222 |       "version": "2.0.0",
223 |       "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
224 |       "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
225 |     },
226 |     "negotiator": {
227 |       "version": "0.6.1",
228 |       "resolved": "https://registry.npmjs.org/negotiator/-/negotiator-0.6.1.tgz",
229 |       "integrity": "sha1-KzJxhOiZIQEXeyhWP7XnECrNDKk="
230 |     },
231 |     "on-finished": {
232 |       "version": "2.3.0",
233 |       "resolved": "https://registry.npmjs.org/on-finished/-/on-finished-2.3.0.tgz",
234 |       "integrity": "sha1-IPEzZIGwg811M3mSoWlxqi2QaUc=",
235 |       "requires": {
236 |         "ee-first": "1.1.1"
237 |       }
238 |     },
239 |     "parseurl": {
240 |       "version": "1.3.2",
241 |       "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.2.tgz",
242 |       "integrity": "sha1-/CidTtiZMRlGDBViUyYs3I3mW/M="
243 |     },
244 |     "path-to-regexp": {
245 |       "version": "0.1.7",
246 |       "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-0.1.7.tgz",
247 |       "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
248 |     },
249 |     "proxy-addr": {
250 |       "version": "2.0.4",
251 |       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.4.tgz",
252 |       "integrity": "sha512-5erio2h9jp5CHGwcybmxmVqHmnCBZeewlfJ0pex+UW7Qny7OOZXTtH56TGNyBizkgiOwhJtMKrVzDTeKcySZwA==",
253 |       "requires": {
254 |         "forwarded": "~0.1.2",
255 |         "ipaddr.js": "1.8.0"
256 |       }
257 |     },
258 |     "qs": {
259 |       "version": "6.5.1",
260 |       "resolved": "https://registry.npmjs.org/qs/-/qs-6.5.1.tgz",
261 |       "integrity": "sha512-eRzhrN1WSINYCDCbrz796z37LOe3m5tmW7RQf6oBntukAG1nmovJvhnwHHRMAfeoItc1m2Hk02WER2aQ/iqs+A=="
262 |     },
263 |     "range-parser": {
264 |       "version": "1.2.0",
265 |       "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.0.tgz",
266 |       "integrity": "sha1-9JvmtIeJTdxA3MlKMi9hEJLgDV4="
267 |     },
268 |     "raw-body": {
269 |       "version": "2.3.2",
270 |       "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.3.2.tgz",
271 |       "integrity": "sha1-vNYMd9Prk83gBQKVw/N5OJvIj4k=",
272 |       "requires": {
273 |         "bytes": "3.0.0",
274 |         "http-errors": "1.6.2",
275 |         "iconv-lite": "0.4.19",
276 |         "unpipe": "1.0.0"
277 |       },
278 |       "dependencies": {
279 |         "depd": {
280 |           "version": "1.1.1",
281 |           "resolved": "https://registry.npmjs.org/depd/-/depd-1.1.1.tgz",
282 |           "integrity": "sha1-V4O04cRZ8G+lyif5kfPQbnoxA1k="
283 |         },
284 |         "http-errors": {
285 |           "version": "1.6.2",
286 |           "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.6.2.tgz",
287 |           "integrity": "sha1-CgAsyFcHGSp+eUbO7cERVfYOxzY=",
288 |           "requires": {
289 |             "depd": "1.1.1",
290 |             "inherits": "2.0.3",
291 |             "setprototypeof": "1.0.3",
292 |             "statuses": ">= 1.3.1 < 2"
293 |           }
294 |         },
295 |         "setprototypeof": {
296 |           "version": "1.0.3",
297 |           "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.0.3.tgz",
298 |           "integrity": "sha1-ZlZ+NwQ+608E2RvWWMDL77VbjgQ="
299 |         }
300 |       }
301 |     },
302 |     "safe-buffer": {
303 |       "version": "5.1.1",
304 |       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.1.tgz",
305 |       "integrity": "sha512-kKvNJn6Mm93gAczWVJg7wH+wGYWNrDHdWvpUmHyEsgCtIwwo3bqPtV4tR5tuPaUhTOo/kvhVwd8XwwOllGYkbg=="
306 |     },
307 |     "send": {
308 |       "version": "0.16.2",
309 |       "resolved": "https://registry.npmjs.org/send/-/send-0.16.2.tgz",
310 |       "integrity": "sha512-E64YFPUssFHEFBvpbbjr44NCLtI1AohxQ8ZSiJjQLskAdKuriYEP6VyGEsRDH8ScozGpkaX1BGvhanqCwkcEZw==",
311 |       "requires": {
312 |         "debug": "2.6.9",
313 |         "depd": "~1.1.2",
314 |         "destroy": "~1.0.4",
315 |         "encodeurl": "~1.0.2",
316 |         "escape-html": "~1.0.3",
317 |         "etag": "~1.8.1",
318 |         "fresh": "0.5.2",
319 |         "http-errors": "~1.6.2",
320 |         "mime": "1.4.1",
321 |         "ms": "2.0.0",
322 |         "on-finished": "~2.3.0",
323 |         "range-parser": "~1.2.0",
324 |         "statuses": "~1.4.0"
325 |       }
326 |     },
327 |     "serve-static": {
328 |       "version": "1.13.2",
329 |       "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.2.tgz",
330 |       "integrity": "sha512-p/tdJrO4U387R9oMjb1oj7qSMaMfmOyd4j9hOFoxZe2baQszgHcSWjuya/CiT5kgZZKRudHNOA0pYXOl8rQ5nw==",
331 |       "requires": {
332 |         "encodeurl": "~1.0.2",
333 |         "escape-html": "~1.0.3",
334 |         "parseurl": "~1.3.2",
335 |         "send": "0.16.2"
336 |       }
337 |     },
338 |     "setprototypeof": {
339 |       "version": "1.1.0",
340 |       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.0.tgz",
341 |       "integrity": "sha512-BvE/TwpZX4FXExxOxZyRGQQv651MSwmWKZGqvmPcRIjDqWub67kTKuIMx43cZZrS/cBBzwBcNDWoFxt2XEFIpQ=="
342 |     },
343 |     "statuses": {
344 |       "version": "1.4.0",
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372 |   }
373 | }
374 | 


--------------------------------------------------------------------------------
/package.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "name": "node-async-block",
 3 |   "version": "0.0.1",
 4 |   "description": "",
 5 |   "main": "index.js",
 6 |   "author": "michael-go",
 7 |   "license": "ISC",
 8 |   "dependencies": {
 9 |     "express": "^4.16.3"
10 |   }
11 | }
12 | 


--------------------------------------------------------------------------------