fix: use wslpath to resolve Windows paths

src/chrome-finder.ts

@@ -12,7 +12,7 @@ const {execSync, execFileSync} = require('child_process');
 const escapeRegExp = require('escape-string-regexp');
 const log = require('lighthouse-logger');
 
-import {getLocalAppDataPath, ChromePathNotSetError} from './utils';
+import {getLocalAppDataPath, toWinDirFormat, ChromePathNotSetError} from './utils';
 
 const newLineRegex = /\r?\n/;
 
@@ -158,8 +158,8 @@ export function linux() {
 export function wsl() {
   // Manually populate the environment variables assuming it's the default config
   process.env.LOCALAPPDATA = getLocalAppDataPath(`${process.env.PATH}`);
-  process.env.PROGRAMFILES = '/mnt/c/Program Files';
-  process.env['PROGRAMFILES(X86)'] = '/mnt/c/Program Files (x86)';
+  process.env.PROGRAMFILES = toWinDirFormat('C:/Program Files');
+  process.env['PROGRAMFILES(X86)'] = toWinDirFormat('C:/Program Files (x86)');
 
   return win32();
 }

src/utils.ts

@@ -6,7 +6,7 @@
 'use strict';
 
 import {join} from 'path';
-import {execSync} from 'child_process';
+import {execSync, execFileSync} from 'child_process';
 import * as mkdirp from 'mkdirp';
 const isWsl = require('is-wsl');
 
@@ -74,21 +74,14 @@ export function makeTmpDir() {
 }
 
 export function toWinDirFormat(dir: string = ''): string {
-  const results = /\/mnt\/([a-z])\//.exec(dir);
-  if (!results) {
-    return dir;
-  }
-
-  const driveLetter = results[1];
-  return dir.replace(`/mnt/${driveLetter}/`, `${driveLetter.toUpperCase()}:\\`)
-      .replace(/\//g, '\\');
+  return execFileSync('wslpath', [dir]).toString().trim();
 }
 
 export function getLocalAppDataPath(path: string): string {
-  const userRegExp = /\/mnt\/([a-z])\/Users\/([^\/:]+)\/AppData\//;
+  const userRegExp = /\/([a-z])\/Users\/([^\/:]+)\/AppData\//;
   const results = userRegExp.exec(path) || [];
 
-  return `/mnt/${results[1]}/Users/${results[2]}/AppData/Local`;
+  return toWinDirFormat(`C:\\${results[1]}\\Users\\${results[2]}\\AppData\\Local`);
 }
 
 function makeUnixTmpDir() {