refactor(parse): refactor parse to use object spread (conventional-changelog#977)

Author: armano2

@commitlint/parse/package.json

@@ -35,12 +35,10 @@
   "license": "MIT",
   "devDependencies": {
     "@commitlint/test": "8.2.0",
-    "@commitlint/utils": "^8.3.4",
-    "@types/lodash": "4.14.149"
+    "@commitlint/utils": "^8.3.4"
   },
   "dependencies": {
     "conventional-changelog-angular": "^5.0.0",
-    "conventional-commits-parser": "^3.0.0",
-    "lodash": "^4.17.15"
+    "conventional-commits-parser": "^3.0.0"
   }
 }

@commitlint/parse/src/index.ts

@@ -1,20 +1,18 @@
-import mergeWith from 'lodash/mergeWith';
 import {Commit, Parser, ParserOptions} from '@commitlint/types';
 
 const {sync} = require('conventional-commits-parser');
 const defaultChangelogOpts = require('conventional-changelog-angular');
 
-export default parse;
-
-async function parse(
+export default async function parse(
 	message: string,
 	parser: Parser = sync,
 	parserOpts?: ParserOptions
 ): Promise<Commit> {
 	const defaultOpts = (await defaultChangelogOpts).parserOpts;
-	const opts = mergeWith({}, defaultOpts, parserOpts, (objValue, srcValue) => {
-		if (Array.isArray(objValue)) return srcValue;
-	});
+	const opts = {
+		...defaultOpts,
+		...(parserOpts || {})
+	};
 	const parsed = parser(message, opts) as Commit;
 	parsed.raw = message;
 	return parsed;