refactor: replace lodash for native alternative (#2242)

- startsWith
- noop
- isFunction
- isString
- find

Refs #2187

src/helpers.js

@@ -1,5 +1,4 @@
 import isObject from 'lodash/isObject';
-import startsWith from 'lodash/startsWith';
 
 const toLower = (str) => String.prototype.toLowerCase.call(str);
 const escapeString = (str) => str.replace(/[^\w]/gi, '_');
@@ -11,7 +10,7 @@ export function isOAS3(spec) {
     return false;
   }
 
-  return startsWith(oasVersion, '3');
+  return oasVersion.startsWith('3');
 }
 
 export function isSwagger2(spec) {
@@ -20,7 +19,7 @@ export function isSwagger2(spec) {
     return false;
   }
 
-  return startsWith(swaggerVersion, '2');
+  return swaggerVersion.startsWith('2');
 }
 
 // Strategy for determining operationId

src/http/index.js

@@ -1,7 +1,6 @@
 import 'cross-fetch/polyfill'; /* global fetch */
 import qs from 'qs';
 import jsYaml from 'js-yaml';
-import isFunction from 'lodash/isFunction';
 import { Buffer } from 'buffer';
 import { FormData, File, Blob } from 'formdata-node';
 
@@ -142,7 +141,7 @@ function serializeHeaderValue(value) {
 //     Cookie: two
 //  =  { Cookie: [ "one", "two" ]
 export function serializeHeaders(headers = {}) {
-  if (!isFunction(headers.entries)) return {};
+  if (typeof headers.entries !== 'function') return {};
 
   return Array.from(headers.entries()).reduce((acc, [header, value]) => {
     acc[header] = serializeHeaderValue(value);

src/index.js

@@ -1,4 +1,3 @@
-import startsWith from 'lodash/startsWith';
 import Url from 'url';
 
 import Http, { makeHttp, serializeRes, serializeHeaders } from './http';
@@ -88,7 +87,7 @@ Swagger.prototype.applyDefaults = function applyDefaults() {
   const { spec } = this;
   const specUrl = this.url;
   // TODO: OAS3: support servers here
-  if (specUrl && startsWith(specUrl, 'http')) {
+  if (specUrl && specUrl.startsWith('http')) {
     const parsed = Url.parse(specUrl);
     if (!spec.host) {
       spec.host = parsed.host;

src/specmap/helpers.js

@@ -1,6 +1,5 @@
 import traverse from 'traverse';
 import URL from 'url';
-import isString from 'lodash/isString';
 
 // This will match if the direct parent's key exactly matches an item.
 const freelyNamedKeyParents = ['properties'];
@@ -59,7 +58,7 @@ export function generateAbsoluteRefPatches(
   const patches = [];
 
   traverse(obj).forEach(function callback() {
-    if (targetKeys.includes(this.key) && isString(this.node)) {
+    if (targetKeys.includes(this.key) && typeof this.node === 'string') {
       const nodePath = this.path; // this node's path, relative to `obj`
       const fullPath = basePath.concat(this.path);
 

src/specmap/index.js

@@ -1,6 +1,3 @@
-import find from 'lodash/find';
-import noop from 'lodash/noop';
-
 import lib from './lib';
 import refs from './lib/refs';
 import allOf from './lib/all-of';
@@ -9,6 +6,7 @@ import properties from './lib/properties';
 import ContextTree from './lib/context-tree';
 
 const HARD_LIMIT = 100;
+const noop = () => {};
 
 class SpecMap {
   static getPluginName(plugin) {
@@ -154,8 +152,7 @@ class SpecMap {
   }
 
   nextPlugin() {
-    // Array.prototype.find doesn't work in IE 11 :(
-    return find(this.wrappedPlugins, (plugin) => {
+    return this.wrappedPlugins.find((plugin) => {
       const mutations = this.getMutationsForPlugin(plugin);
       return mutations.length > 0;
     });