Add basic usage

.eslintrc

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+env:
+  node: true
+extends: eslint:recommended
+parserOptions:
+  ecmaVersion: 8
+rules:
+  no-console: 0

.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+
+# Coverage directory used by tools like istanbul
+coverage
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Typescript v1 declaration files
+typings/
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variables file
+.env
+

LICENSE

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+MIT License
+
+Copyright (c) 2017 Suguru Motegi
+
+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.

README.md

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+# async-hooks-example

basic.js

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+'use strict';
+
+const fs = require('fs');
+const util = require('util');
+const asyncHooks = require('async_hooks');
+
+const hooks = {
+  // Resourceが生成されるときに呼ばれる
+  init(asyncId, type, triggerAsyncId, resource) {
+    const obj = {
+      asyncId,
+      type,
+      triggerAsyncId,
+      resource
+    };
+    fs.writeSync(1, `init\n${util.format(obj)}\n`);
+  },
+  // Resourceのcallbackが呼ばれる直前に呼ばれる
+  before(asyncId) {
+    fs.writeSync(1, `before\t${util.format({ asyncId })}\n`);
+  },
+  // Resourceのcallbackが終了したときに呼ばれる
+  after(asyncId) {
+    fs.writeSync(1, `after\t${util.format({ asyncId })}\n`);
+  },
+  // Resourceが破棄されるときに呼ばれる
+  destroy(asyncId) {
+    fs.writeSync(1, `destroy\t${util.format({ asyncId })}\n`);
+  },
+  // Promiseのresolveが呼ばれるタイミングで呼ばれる
+  promiseResolve(asyncId) {
+    fs.writeSync(1, `promiseResolve\t${util.format({ asyncId })}\n`);
+  }
+};
+
+// Hookの生成
+const asyncHook = asyncHooks.createHook(hooks);
+
+// Hookを有効にする
+asyncHook.enable();
+
+// 1秒おきにResourceの生成
+(function start() {
+  // 実行中のasyncId
+  const eid = asyncHooks.executionAsyncId();
+  // 呼び出し元のasyncId
+  const tid = asyncHooks.triggerAsyncId();
+  console.log(`start\teid: ${eid} tid: ${tid}`);
+  setTimeout(start, 1000);
+})();
+
+// 10秒後にhookを無効にする
+setTimeout(() => asyncHook.disable(), 10000);

package.json

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+{
+  "name": "async-hooks-example",
+  "version": "0.0.0",
+  "description": "",
+  "main": "index.js",
+  "private": true,
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/suguru03/async-hooks-example.git"
+  },
+  "author": "",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/suguru03/async-hooks-example/issues"
+  },
+  "homepage": "https://github.com/suguru03/async-hooks-example#readme"
+}