Remove mkdirp dependency (#2880)

lib/core/resultsStorage/storageManager.js

@@ -4,7 +4,7 @@ const fs = require('fs-extra');
 const path = require('path');
 const pathToFolder = require('./pathToFolder');
 const { promisify } = require('util');
-const mkdirp = promisify(require('mkdirp'));
+const mkdir = promisify(fs.mkdir);
 
 function write(dirPath, filename, data) {
   return fs.writeFile(path.join(dirPath, filename), data);
@@ -28,7 +28,7 @@ module.exports = function storageManager(baseDir, storagePathPrefix, useHash) {
       const pathSegments = [baseDir, ...subDirs].filter(isValidDirectoryName);
 
       const dirPath = path.join.apply(null, pathSegments);
-      return mkdirp(dirPath).then(() => dirPath);
+      return mkdir(dirPath, { recursive: true }).then(() => dirPath);
     },
     writeData(data, filename) {
       return this.createDirectory('data').then(dir =>

package.json

@@ -98,7 +98,6 @@
     "lodash.set": "4.3.2",
     "lodash.union": "4.6.0",
     "markdown": "0.5.0",
-    "mkdirp": "0.5.1",
     "node-slack": "0.0.7",
     "p-limit": "2.2.2",
     "pagexray": "2.5.9",