src: implement standard.js linting

In addition:

* moved module.exports to the bottom
* no single-line if statements
* no if statements without a {
* const for requires
* array declarations get spaces inside [ ]
* 'use strict' in all .js files

PR-URL: #1794
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: João Reis <reis@janeasystems.com>

bin/node-gyp.js

@@ -1,17 +1,19 @@
 #!/usr/bin/env node
 
+'use strict'
+
 process.title = 'node-gyp'
 
-var envPaths = require('env-paths')
-var gyp = require('../')
-var log = require('npmlog')
-var os = require('os')
+const envPaths = require('env-paths')
+const gyp = require('../')
+const log = require('npmlog')
+const os = require('os')
 
 /**
  * Process and execute the selected commands.
  */
 
-var prog = gyp()
+const prog = gyp()
 var completed = false
 prog.parseArgv(process.argv)
 prog.devDir = prog.opts.devdir
@@ -24,8 +26,8 @@ if (prog.devDir) {
 } else {
   throw new Error(
     "node-gyp requires that the user's home directory is specified " +
-    "in either of the environmental variables HOME or USERPROFILE. " +
-    "Overide with: --devdir /path/to/.node-gyp")
+    'in either of the environmental variables HOME or USERPROFILE. ' +
+    'Overide with: --devdir /path/to/.node-gyp')
 }
 
 if (prog.todo.length === 0) {
@@ -42,7 +44,6 @@ log.verbose('cli', process.argv)
 log.info('using', 'node-gyp@%s', prog.version)
 log.info('using', 'node@%s | %s | %s', process.versions.node, process.platform, process.arch)
 
-
 /**
  * Change dir if -C/--directory was passed.
  */
@@ -84,7 +85,7 @@ function run () {
       log.error('not ok')
       return process.exit(1)
     }
-    if (command.name == 'list') {
+    if (command.name === 'list') {
       var versions = arguments[1]
       if (versions.length > 0) {
         versions.forEach(function (version) {
@@ -122,18 +123,18 @@ function errorMessage () {
   var os = require('os')
   log.error('System', os.type() + ' ' + os.release())
   log.error('command', process.argv
-            .map(JSON.stringify).join(' '))
+    .map(JSON.stringify).join(' '))
   log.error('cwd', process.cwd())
   log.error('node -v', process.version)
   log.error('node-gyp -v', 'v' + prog.package.version)
 }
 
 function issueMessage () {
   errorMessage()
-  log.error('', [ 'This is a bug in `node-gyp`.'
-                , 'Try to update node-gyp and file an Issue if it does not help:'
-                , '    <https://github.com/nodejs/node-gyp/issues>'
-                ].join('\n'))
+  log.error('', [ 'This is a bug in `node-gyp`.',
+    'Try to update node-gyp and file an Issue if it does not help:',
+    '    <https://github.com/nodejs/node-gyp/issues>'
+  ].join('\n'))
 }
 
 // start running the given commands!

lib/build.js

@@ -1,12 +1,11 @@
+'use strict'
 
-module.exports = exports = build
-
-var fs = require('graceful-fs')
-  , path = require('path')
-  , glob = require('glob')
-  , log = require('npmlog')
-  , which = require('which')
-  , win = process.platform === 'win32'
+const fs = require('graceful-fs')
+const path = require('path')
+const glob = require('glob')
+const log = require('npmlog')
+const which = require('which')
+const win = process.platform === 'win32'
 
 exports.usage = 'Invokes `' + (win ? 'msbuild' : 'make') + '` and builds the module'
 
@@ -17,18 +16,19 @@ function build (gyp, argv, callback) {
   } else if (process.platform.indexOf('bsd') !== -1) {
     platformMake = 'gmake'
   } else if (win && argv.length > 0) {
-    argv = argv.map(function(target) {
+    argv = argv.map(function (target) {
       return '/t:' + target
     })
   }
 
   var makeCommand = gyp.opts.make || process.env.MAKE || platformMake
-    , command = win ? 'msbuild' : makeCommand
-    , jobs = gyp.opts.jobs || process.env.JOBS
-    , buildType
-    , config
-    , arch
-    , nodeDir
+  var command = win ? 'msbuild' : makeCommand
+  var jobs = gyp.opts.jobs || process.env.JOBS
+  var buildType
+  var config
+  var arch
+  var nodeDir
+  var guessedSolution
 
   loadConfigGypi()
 
@@ -38,16 +38,17 @@ function build (gyp, argv, callback) {
 
   function loadConfigGypi () {
     var configPath = path.resolve('build', 'config.gypi')
+
     fs.readFile(configPath, 'utf8', function (err, data) {
       if (err) {
-        if (err.code == 'ENOENT') {
+        if (err.code === 'ENOENT') {
           callback(new Error('You must run `node-gyp configure` first!'))
         } else {
           callback(err)
         }
         return
       }
-      config = JSON.parse(data.replace(/\#.+\n/, ''))
+      config = JSON.parse(data.replace(/#.+\n/, ''))
 
       // get the 'arch', 'buildType', and 'nodeDir' vars from the config
       buildType = config.target_defaults.default_configuration
@@ -79,7 +80,9 @@ function build (gyp, argv, callback) {
 
   function findSolutionFile () {
     glob('build/*.sln', function (err, files) {
-      if (err) return callback(err)
+      if (err) {
+        return callback(err)
+      }
       if (files.length === 0) {
         return callback(new Error('Could not find *.sln file. Did you run "configure"?'))
       }
@@ -124,9 +127,12 @@ function build (gyp, argv, callback) {
   function doBuild () {
     // Enable Verbose build
     var verbose = log.levels[log.level] <= log.levels.verbose
+    var j
+
     if (!win && verbose) {
       argv.push('V=1')
     }
+
     if (win && !verbose) {
       argv.push('/clp:Verbosity=minimal')
     }
@@ -142,12 +148,12 @@ function build (gyp, argv, callback) {
       // Since there are many ways to state '32-bit Intel', default to it.
       // N.B. msbuild's Condition string equality tests are case-insensitive.
       var archLower = arch.toLowerCase()
-      var p = archLower === 'x64' ? 'x64' :
-              (archLower === 'arm' ? 'ARM' :
-              (archLower === 'arm64' ? 'ARM64' : 'Win32'))
+      var p = archLower === 'x64' ? 'x64'
+        : (archLower === 'arm' ? 'ARM'
+          : (archLower === 'arm64' ? 'ARM64' : 'Win32'))
       argv.push('/p:Configuration=' + buildType + ';Platform=' + p)
       if (jobs) {
-        var j = parseInt(jobs, 10)
+        j = parseInt(jobs, 10)
         if (!isNaN(j) && j > 0) {
           argv.push('/m:' + j)
         } else if (jobs.toUpperCase() === 'MAX') {
@@ -160,7 +166,7 @@ function build (gyp, argv, callback) {
       argv.push('-C')
       argv.push('build')
       if (jobs) {
-        var j = parseInt(jobs, 10)
+        j = parseInt(jobs, 10)
         if (!isNaN(j) && j > 0) {
           argv.push('--jobs')
           argv.push(j)
@@ -174,7 +180,7 @@ function build (gyp, argv, callback) {
     if (win) {
       // did the user specify their own .sln file?
       var hasSln = argv.some(function (arg) {
-        return path.extname(arg) == '.sln'
+        return path.extname(arg) === '.sln'
       })
       if (!hasSln) {
         argv.unshift(gyp.opts.solution || guessedSolution)
@@ -195,3 +201,5 @@ function build (gyp, argv, callback) {
     callback()
   }
 }
+
+module.exports = build

lib/clean.js

@@ -1,10 +1,7 @@
+'use strict'
 
-module.exports = exports = clean
-
-exports.usage = 'Removes any generated build files and the "out" dir'
-
-var rm = require('rimraf')
-var log = require('npmlog')
+const rm = require('rimraf')
+const log = require('npmlog')
 
 function clean (gyp, argv, callback) {
   // Remove the 'build' dir
@@ -13,3 +10,6 @@ function clean (gyp, argv, callback) {
   log.verbose('clean', 'removing "%s" directory', buildDir)
   rm(buildDir, callback)
 }
+
+module.exports = clean
+module.exports.usage = 'Removes any generated build files and the "out" dir'