Replace separate Lodash packages with the core package (#569)

Author: Richienb

package.json

@@ -38,11 +38,7 @@
 		"eslint-ast-utils": "^1.1.0",
 		"eslint-template-visitor": "^1.1.0",
 		"import-modules": "^2.0.0",
-		"lodash.camelcase": "^4.3.0",
-		"lodash.defaultsdeep": "^4.6.1",
-		"lodash.kebabcase": "^4.1.1",
-		"lodash.snakecase": "^4.1.1",
-		"lodash.upperfirst": "^4.3.1",
+		"lodash": "^4.17.15",
 		"read-pkg-up": "^7.0.1",
 		"regexp-tree": "^0.1.20",
 		"reserved-words": "^0.1.2",

rules/custom-error-definition.js

@@ -1,12 +1,12 @@
 'use strict';
-const upperfirst = require('lodash.upperfirst');
+const {upperFirst} = require('lodash');
 const getDocumentationUrl = require('./utils/get-documentation-url');
 
 const MESSAGE_ID_INVALID_EXPORT = 'invalidExport';
 
 const nameRegexp = /^(?:[A-Z][\da-z]*)*Error$/;
 
-const getClassName = name => upperfirst(name).replace(/(?:error|)$/i, 'Error');
+const getClassName = name => upperFirst(name).replace(/(?:error|)$/i, 'Error');
 
 const getConstructorMethod = className => `
 	constructor() {

rules/filename-case.js

@@ -1,13 +1,10 @@
 'use strict';
 const path = require('path');
-const camelCase = require('lodash.camelcase');
-const kebabCase = require('lodash.kebabcase');
-const snakeCase = require('lodash.snakecase');
-const upperfirst = require('lodash.upperfirst');
+const {camelCase, kebabCase, snakeCase, upperFirst} = require('lodash');
 const getDocumentationUrl = require('./utils/get-documentation-url');
 const cartesianProductSamples = require('./utils/cartesian-product-samples');
 
-const pascalCase = string => upperfirst(camelCase(string));
+const pascalCase = string => upperFirst(camelCase(string));
 const numberRegex = /\d+/;
 const PLACEHOLDER = '\uFFFF\uFFFF\uFFFF';
 const PLACEHOLDER_REGEX = new RegExp(PLACEHOLDER, 'i');

rules/prevent-abbreviations.js

@@ -1,16 +1,14 @@
 'use strict';
 const path = require('path');
 const astUtils = require('eslint-ast-utils');
-const defaultsDeep = require('lodash.defaultsdeep');
+const {defaultsDeep, upperFirst, lowerFirst} = require('lodash');
 
 const getDocumentationUrl = require('./utils/get-documentation-url');
 const avoidCapture = require('./utils/avoid-capture');
 const cartesianProductSamples = require('./utils/cartesian-product-samples');
 
 const isUpperCase = string => string === string.toUpperCase();
 const isUpperFirst = string => isUpperCase(string[0]);
-const lowerFirst = string => string[0].toLowerCase() + string.slice(1);
-const upperFirst = string => string[0].toUpperCase() + string.slice(1);
 
 // Keep this alphabetically sorted for easier maintenance
 const defaultReplacements = {