feat: temp

Author: clChenLiang

.DS_Store

@@ -0,0 +1 @@
+s

images/.DS_Store

@@ -0,0 +1,96 @@
+## 源码解析
+```js
+#!/usr/bin/env node
+;(function () { // wrapper in case we're in module_context mode
+  // windows: running "npm blah" in this folder will invoke WSH, not node.
+  /*global WScript*/
+  // WScript 是 windows 下的一个运行脚本的工具
+  if (typeof WScript !== 'undefined') {
+    WScript.echo(
+      'npm does not work when run\n' +
+        'with the Windows Scripting Host\n\n' +
+        "'cd' to a different directory,\n" +
+        "or type 'npm.cmd <args>',\n" +
+        "or type 'node npm <args>'."
+    )
+    WScript.quit(1)
+    return
+  }
+
+  process.title = 'npm'
+
+  var unsupported = require('../lib/utils/unsupported.js')
+  unsupported.checkForBrokenNode()
+
+  var log = require('npmlog')
+  log.pause() // will be unpaused when config is loaded.
+  log.info('it worked if it ends with', 'ok')
+
+  unsupported.checkForUnsupportedNode()
+
+  if (!unsupported.checkVersion(process.version).unsupported) {
+    var updater = require('update-notifier')
+    var pkg = require('../package.json')
+    updater({pkg: pkg}).notify({defer: true})
+  }
+
+  var path = require('path')
+  var npm = require('../lib/npm.js')
+  var npmconf = require('../lib/config/core.js')
+  var errorHandler = require('../lib/utils/error-handler.js')
+  var output = require('../lib/utils/output.js')
+
+  var configDefs = npmconf.defs
+  var shorthands = configDefs.shorthands
+  var types = configDefs.types
+  var nopt = require('nopt')
+
+  // if npm is called as "npmg" or "npm_g", then
+  // run in global mode.
+  if (path.basename(process.argv[1]).slice(-1) === 'g') {
+    process.argv.splice(1, 1, 'npm', '-g')
+  }
+
+  log.verbose('cli', process.argv)
+
+  var conf = nopt(types, shorthands)
+  npm.argv = conf.argv.remain
+  if (npm.deref(npm.argv[0])) npm.command = npm.argv.shift()
+  else conf.usage = true
+
+  if (conf.version) {
+    console.log(npm.version)
+    return errorHandler.exit(0)
+  }
+
+  if (conf.versions) {
+    npm.command = 'version'
+    conf.usage = false
+    npm.argv = []
+  }
+
+  log.info('using', 'npm@%s', npm.version)
+  log.info('using', 'node@%s', process.version)
+
+  process.on('uncaughtException', errorHandler)
+
+  if (conf.usage && npm.command !== 'help') {
+    npm.argv.unshift(npm.command)
+    npm.command = 'help'
+  }
+
+  // now actually fire up npm and run the command.
+  // this is how to use npm programmatically:
+  conf._exit = true
+  npm.load(conf, function (er) {
+    if (er) return errorHandler(er)
+    npm.commands[npm.command](npm.argv, function (err) {
+      // https://www.youtube.com/watch?v=7nfPu8qTiQU
+      if (!err && npm.config.get('ham-it-up') && !npm.config.get('json') && !npm.config.get('parseable') && npm.command !== 'completion') {
+        output('\n 🎵 I Have the Honour to Be Your Obedient Servant,🎵 ~ npm 📜🖋\n')
+      }
+      errorHandler.apply(this, arguments)
+    })
+  })
+})()
+```

images/techArticle/.DS_Store

@@ -0,0 +1,24 @@
+## 入口
+```
+每个 `npm` 包都有一个主入口。
+一般为 `index.js`, `main.js`, `package.json.main`。优先使用 `pkg.json` 中的 `main`。
+```
+
+### npm
+npm 包中，`package.json` 中 `main` 指定了入口文件为:
+```json
+"main": "./lib/npm.js"
+```
+分析 `npm.js` 中，可以看到有
+```js
+if (require.main === module) {
+    require('../bin/npm-cli.js')
+}
+```
+这样的一段代码。当运行的主程序为该文件时，引用 `/bin/npm-cli.js`。确保执行到 cli 文件。
+
+```
+* 存疑 *: 主程序指的是什么，使用 node 运行的时候，并不能得到预期结果。
+什么时候会用到？
+```
+执行 `npm.js` 时，会被切换 `npm-cli.js` 去

techArticle/npm/bin/npm-cli.js

@@ -112,3 +112,10 @@ process.emit('time', 'stage:' + name)
 ```js
 var cmd = require(path.join(__dirname, a + '.js'))
 ```
+
+3. 相关概论
+deref: Dereference -- 间接引用
+
+module.main -- 运行程序的主模块
+
+