feat(add): add tink add, to add new dependencies

bin/tink.js

@@ -3,6 +3,7 @@
 require('../lib/node/index.js')
 
 const CMDS = new Map([
+  ['add', require('../lib/commands/add.js')],
   ['shell', require('../lib/commands/shell.js')],
   ['org', require('../lib/commands/org.jsx')],
   ['prepare', require('../lib/commands/prepare.js')],

lib/commands/add.js

@@ -0,0 +1,71 @@
+'use strict'
+
+'use strict'
+
+const Add = module.exports = {
+  command: 'add <pkg>',
+  describe: 'Add a dependency.',
+  builder (y) {
+    return y.help().alias('help', 'h')
+      .options(Add.options)
+  },
+  options: Object.assign(require('../common-opts.js', {
+    'development': {
+      alias: ['dev', 'D'],
+      describe: 'Add this dependency as a devDependency',
+      type: 'boolean'
+    },
+    'production': {
+      alias: ['prod', 'P'],
+      describe: 'Add this dependency as a regular dependency',
+      type: 'boolean',
+      default: true
+    },
+    'bundle': {
+      alias: ['bundled', 'B'],
+      describe: 'Add this dependency as a bundledDependency',
+      type: 'boolean'
+    }
+  })),
+  handler: async argv => add(argv)
+}
+
+async function add (argv) {
+  const BB = require('bluebird')
+
+  const figgyPudding = require('figgy-pudding')
+  const log = require('npmlog')
+  const npmConfig = require('../config.js')
+  const spawn = require('child_process').spawn
+
+  const AddConfig = figgyPudding({
+    log: { default: () => log },
+    silent: {}
+  }, { other () { return true } })
+
+  const opts = AddConfig(npmConfig().concat(argv).concat({ log }))
+
+  await new BB((resolve, reject) => {
+    const npmBin = process.platform === 'win32' ? 'npm.cmd' : 'npm'
+    const child = spawn(npmBin, [
+      'add', opts.pkg, '--package-lock-only'
+      // We add argv here to get npm to parse those options for us :D
+    ].concat(process.argv.slice(3).filter(x => {
+      return !['--bundle', '--development', '--production'].find(y => y === x)
+    }) || []), {
+      env: process.env,
+      cwd: process.cwd(),
+      stdio: 'inherit'
+    })
+    child.on('error', reject)
+    child.on('close', code => {
+      if (code === 127) {
+        reject(new Error('`npm` command not found. Please ensure you have npm@5.4.0 or later installed.'))
+      } else if (code) {
+        reject(new Error('non-zero exit code: ' + code))
+      } else {
+        resolve()
+      }
+    })
+  })
+}