feat: remove lodash dependency

This module is not using the vast majority of Lodash's functions. The
small handful used can be replaced by more targeted dependencies that
still supports the full range of Node.js versions gulp-uglify supports.

Bug: #351

.travis.yml

@@ -12,4 +12,4 @@ matrix:
     - node_js: 10
       script: npm run lint
 script:
-  - node --throw-deprecation ./node_modules/.bin/tape --require intelli-espower-loader test/*.js
+  - node --throw-deprecation ./node_modules/.bin/tape test/*.js

lib/create-error.js

@@ -1,5 +1,4 @@
 'use strict';
-var curry = require('lodash/fp/curry');
 var GulpUglifyError = require('./gulp-uglify-error');
 
 function createError(file, msg, cause) {
@@ -10,4 +9,4 @@ function createError(file, msg, cause) {
   return perr;
 }
 
-module.exports = curry(createError);
+module.exports = createError;

lib/log.js

@@ -1,15 +1,15 @@
 'use strict';
 var hasLog = require('has-gulplog');
-var each = require('lodash/fp/forEach');
+var each = require('array-each');
 
 var levels = ['debug', 'info', 'warn', 'error'];
 
-each(function(level) {
+each(levels, function(level) {
   module.exports[level] = function() {
     if (hasLog()) {
       var log = require('gulplog');
 
       log[level].apply(log, arguments);
     }
   };
-}, levels);
+});

lib/minify.js

@@ -1,8 +1,8 @@
 'use strict';
 var Buffer = require('safe-buffer').Buffer;
 var applySourceMap = require('vinyl-sourcemaps-apply');
-var isObject = require('lodash/fp/isObject');
-var defaultsDeep = require('lodash/fp/defaultsDeep');
+var isObject = require('isobject');
+var extend = require('extend-shallow');
 var createError = require('./create-error');
 
 module.exports = function(uglify, log) {
@@ -12,7 +12,8 @@ module.exports = function(uglify, log) {
       opts = {};
     }
 
-    return defaultsDeep(
+    return extend(
+      {},
       {
         output: {}
       },

package.json

@@ -5,9 +5,11 @@
   "author": "Terin Stock <terinjokes@gmail.com>",
   "bugs": "https://github.com/terinjokes/gulp-uglify/issues",
   "dependencies": {
+    "array-each": "^1.0.1",
+    "extend-shallow": "^3.0.2",
     "gulplog": "^1.0.0",
     "has-gulplog": "^0.1.0",
-    "lodash": "^4.13.1",
+    "isobject": "^3.0.1",
     "make-error-cause": "^1.1.1",
     "safe-buffer": "^5.1.2",
     "through2": "^2.0.0",
@@ -21,7 +23,6 @@
     "eslint-plugin-no-use-extend-native": "^0.3.12",
     "eslint-plugin-prettier": "^2.0.1",
     "eslint-plugin-unicorn": "^2.1.0",
-    "intelli-espower-loader": "^1.0.1",
     "power-assert": "^1.4.1",
     "prettier": "^1.1.0",
     "source-list-map": "^1.1.2",
@@ -70,7 +71,7 @@
   ],
   "scripts": {
     "lint": "eslint *.js lib test",
-    "test": "tape --require intelli-espower-loader test/*.js"
+    "test": "tape test/*.js"
   },
   "greenkeeper": {
     "ignore": [