Make codebase conform to ESLint rules

Just a couple of changes.

knex.js

@@ -5,4 +5,4 @@
 //     For details and documentation:
 //     http://knexjs.org
 
-module.exports = require('./lib/index')
+module.exports = require('./lib/index');

src/bin/cli.js

@@ -1,16 +1,16 @@
 #!/usr/bin/env node
-
-
-var Liftoff   = require('liftoff');
-var Promise   = require('bluebird');
-var interpret = require('interpret');
-var path      = require('path');
-var chalk     = require('chalk');
-var tildify   = require('tildify');
-var commander = require('commander');
-var cliPkg    = require('../../package');
-var argv      = require('minimist')(process.argv.slice(2));
-var fs        = Promise.promisifyAll(require('fs'));
+/* eslint no-console:0 */
+
+import Liftoff from 'liftoff';
+import Promise from 'bluebird';
+import interpret from 'interpret';
+import path from 'path';
+import chalk from 'chalk';
+import tildify from 'tildify';
+import commander from 'commander';
+const argv      = require('minimist')(process.argv.slice(2));
+const fs        = Promise.promisifyAll(require('fs'));
+const cliPkg = require('../../package');
 
 function exit(text) {
   if (text instanceof Error) {
@@ -46,9 +46,9 @@ function initKnex(env) {
     console.log('Working directory changed to', chalk.magenta(tildify(env.cwd)));
   }
 
-  var environment = commander.env || process.env.NODE_ENV;
-  var defaultEnv  = 'development';
-  var config      = require(env.configPath);
+  let environment = commander.env || process.env.NODE_ENV;
+  const defaultEnv  = 'development';
+  let config      = require(env.configPath);
 
   if (!environment && typeof config[defaultEnv] === 'object') {
     environment = defaultEnv;
@@ -66,13 +66,14 @@ function initKnex(env) {
 
   if (argv.debug !== undefined)
     config.debug = argv.debug;
-  var knex = require(env.modulePath);
+  const knex = require(env.modulePath);
   return knex(config);
 }
 
 function invoke(env) {
 
-  var pending, filetypes = ['js', 'coffee', 'eg', 'ls'];
+  const filetypes = ['js', 'coffee', 'eg', 'ls'];
+  let pending = null;
 
   commander
     .version(
@@ -88,34 +89,35 @@ function invoke(env) {
   commander
     .command('init')
     .description('        Create a fresh knexfile.')
-    .option('-x [' + filetypes.join('|') + ']', 'Specify the knexfile extension (default js)')
+    .option(`-x [${filetypes.join('|')}]`, 'Specify the knexfile extension (default js)')
     .action(function() {
-      var type = (argv.x || 'js').toLowerCase();
+      const type = (argv.x || 'js').toLowerCase();
       if (filetypes.indexOf(type) === -1) {
-        exit('Invalid filetype specified: ' + type);
+        exit(`Invalid filetype specified: ${type}`);
       }
       if (env.configPath) {
-        exit('Error: ' + env.configPath + ' already exists');
+        exit(`Error: ${env.configPath} already exists`);
       }
       checkLocalModule(env);
-      var stubPath = './knexfile.' + type;
-      pending = fs.readFileAsync(path.dirname(env.modulePath) + '/lib/migrate/stub/knexfile-' + type + '.stub')
-        .then(function(code) {
-          return fs.writeFileAsync(stubPath, code);
-        }).then(function() {
-          success(chalk.green('Created ' + stubPath));
-        }).catch(exit);
+      const stubPath = `./knexfile.${type}`;
+      pending = fs.readFileAsync(
+        path.dirname(env.modulePath) +
+        '/lib/migrate/stub/knexfile-' +
+        type + '.stub'
+      ).then(code => fs.writeFileAsync(stubPath, code)).then(() => {
+        success(chalk.green(`Created ${stubPath}`));
+      }).catch(exit);
     });
 
   commander
     .command('migrate:make <name>')
     .description('       Create a named migration file.')
-    .option('-x [' + filetypes.join('|') + ']', 'Specify the stub extension (default js)')
+    .option(`-x [${filetypes.join('|')}]`, 'Specify the stub extension (default js)')
     .action(function(name) {
-      var instance = initKnex(env);
-      var ext = (argv.x || env.configPath.split('.').pop()).toLowerCase();
+      const instance = initKnex(env);
+      const ext = (argv.x || env.configPath.split('.').pop()).toLowerCase();
       pending = instance.migrate.make(name, {extension: ext}).then(function(name) {
-        success(chalk.green('Created Migration: ' + name));
+        success(chalk.green(`Created Migration: ${name}`));
       }).catch(exit);
     });
 
@@ -127,7 +129,10 @@ function invoke(env) {
         if (log.length === 0) {
           success(chalk.cyan('Already up to date'));
         }
-        success(chalk.green('Batch ' + batchNo + ' run: ' + log.length + ' migrations \n' + chalk.cyan(log.join('\n'))));
+        success(
+          chalk.green(`Batch ${batchNo} run: ${log.length} migrations \n`) +
+          chalk.cyan(log.join('\n'))
+        );
       }).catch(exit);
     });
 
@@ -139,7 +144,10 @@ function invoke(env) {
         if (log.length === 0) {
           success(chalk.cyan('Already at the base migration'));
         }
-        success(chalk.green('Batch ' + batchNo + ' rolled back: ' + log.length + ' migrations \n') + chalk.cyan(log.join('\n')));
+        success(
+          chalk.green(`Batch ${batchNo} rolled back: ${log.length} migrations \n`) +
+          chalk.cyan(log.join('\n'))
+        );
       }).catch(exit);
     });
 
@@ -155,12 +163,12 @@ function invoke(env) {
   commander
     .command('seed:make <name>')
     .description('       Create a named seed file.')
-    .option('-x [' + filetypes.join('|') + ']', 'Specify the stub extension (default js)')
+    .option(`-x [${filetypes.join('|')}]`, 'Specify the stub extension (default js)')
     .action(function(name) {
-      var instance = initKnex(env);
-      var ext = (argv.x || env.configPath.split('.').pop()).toLowerCase();
+      const instance = initKnex(env);
+      const ext = (argv.x || env.configPath.split('.').pop()).toLowerCase();
       pending = instance.seed.make(name, {extension: ext}).then(function(name) {
-        success(chalk.green('Created seed file: ' + name));
+        success(chalk.green(`Created seed file: ${name}`));
       }).catch(exit);
     });
 
@@ -172,7 +180,7 @@ function invoke(env) {
         if (log.length === 0) {
           success(chalk.cyan('No seed files exist'));
         }
-        success(chalk.green('Ran ' + log.length + ' seed files \n' + chalk.cyan(log.join('\n'))));
+        success(chalk.green(`Ran ${log.length} seed files \n${chalk.cyan(log.join('\n'))}`));
       }).catch(exit);
     });
 
@@ -183,7 +191,7 @@ function invoke(env) {
   });
 }
 
-var cli = new Liftoff({
+const cli = new Liftoff({
   name: 'knex',
   extensions: interpret.jsVariants,
   v8flags: require('v8flags')