Remove lodash dependency

lintingDir/elm-files.js

@@ -1,18 +1,21 @@
 const path = require('path');
-const _ = require('lodash');
 const fs = require('fs-extra');
 const glob = require('glob');
 
 const defaultGlob = '**/*.elm';
 const ignore = ['**/elm-stuff/**', '**/node_modules/**', 'lintingDir/**'];
 
+function flatMap(array, fn) {
+  return array.reduce((res, item) => res.concat(fn(item)), []);
+}
+
 function getFiles(filename) {
   if (!fs.existsSync(filename)) {
     return [];
   }
   if (fs.lstatSync(filename).isDirectory()) {
     console.log(candidate);
-    return _.flatMap(
+    return flatMap(
       glob.sync('/' + defaultGlob, {
         root: filename,
         nocase: true,
@@ -28,9 +31,7 @@ function getFiles(filename) {
 // Recursively search directories for *.elm files, excluding elm-stuff/
 function resolveFilePath(filename) {
   // Exclude everything having anything to do with elm-stuff
-  return getFiles(filename).filter(
-    candidate => !candidate.split(path.sep).includes('elm-stuff')
-  );
+  return getFiles(filename).filter(candidate => !candidate.split(path.sep).includes('elm-stuff'));
 }
 
 function globify(filename) {
@@ -52,17 +53,16 @@ function globifyWithRoot(root, filename) {
 
 function getElmFilePaths(filePathArgs) {
   if (filePathArgs.length > 0) {
-    return _.flatMap(filePathArgs, globify);
+    return flatMap(filePathArgs, globify);
   }
 
   const root = path.join(path.resolve(process.cwd()), '..');
   return globifyWithRoot(root, '**/*.elm');
 }
 
-
 function getElmFiles(filePathArgs) {
   const relativeElmFiles = getElmFilePaths(filePathArgs);
-  return _.flatMap(relativeElmFiles, resolveFilePath).map(file => {
+  return flatMap(relativeElmFiles, resolveFilePath).map(file => {
     return {
       filename: file,
       source: fs.readFileSync(file, 'utf8')

lintingDir/package-lock.json

@@ -45,11 +45,6 @@
       "version": "https://registry.npmjs.org/jsonfile/-/jsonfile-3.0.0.tgz",
       "integrity": "sha1-kufHRE5f/V+jLmqa6LhQNN+DR9A="
     },
-    "lodash": {
-      "version": "4.17.4",
-      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.4.tgz",
-      "integrity": "sha1-eCA6TRwyiuHYbcpkYONptX9AVa4="
-    },
     "minimatch": {
       "version": "https://registry.npmjs.org/minimatch/-/minimatch-3.0.4.tgz",
       "integrity": "sha1-UWbihkV/AzBgZL5Ul+jbsMPTIIM="

lintingDir/package.json

@@ -11,7 +11,6 @@
   "license": "ISC",
   "dependencies": {
     "fs-extra": "^3.0.1",
-    "glob": "^7.1.2",
-    "lodash": "^4.17.4"
+    "glob": "^7.1.2"
   }
 }