angular-cli: Error: Unexpected end of file

Bug Report or Feature Request (mark with an x)

- [x] bug report
- [ ] feature request

Area

- [x] devkit
- [ ] schematics

Versions

node --version
v10.3.0

npm --version
6.1.0

sw_vers
ProductName:	Mac OS X
ProductVersion:	10.12.6
BuildVersion:	16G1314

Repro steps

npm uninstall -g @angular/cli

npm cache verify

npm install -g @angular/cli

ng version
     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/


Angular CLI: 6.0.8
Node: 10.3.0
OS: darwin x64
Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.6.8
@angular-devkit/core         0.6.8
@angular-devkit/schematics   0.6.8
@schematics/angular          0.6.8
@schematics/update           0.6.8
rxjs                         6.2.0
typescript                   2.7.2

ng new foo                                                                                                                                                                                                                                                                                                        ✘ 141

The log given by the failure

Unexpected end of file.
Error: Unexpected end of file.
    at _readValue (/usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:533:19)
    at parseJsonAst (/usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:605:17)
    at Object.parseJson (/usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js:631:12)
    at getLegacyPackageManager (/usr/local/lib/node_modules/@angular/cli/utilities/config.js:179:35)
    at Object.getPackageManager (/usr/local/lib/node_modules/@angular/cli/utilities/config.js:120:38)
    at NewCommand.runSchematic (/usr/local/lib/node_modules/@angular/cli/models/schematic-command.js:74:38)
    at NewCommand.<anonymous> (/usr/local/lib/node_modules/@angular/cli/commands/new.js:77:25)
    at Generator.next (<anonymous>)
    at /usr/local/lib/node_modules/@angular/cli/commands/new.js:7:71
    at new Promise (<anonymous>)

Desired functionality

Properly recovered from or better error message caused by bad data in user files. The cause was that ~/.angular-cli.json was an empty file.

Mention any other details that might be useful

I track down the error using

node --inspect --debug-brk  /usr/local/bin/ng new foo

with a break-point in /usr/local/lib/node_modules/@angular/cli/node_modules/@angular-devkit/core/src/json/parser.js just before UnexpectedEndOfInputException call super("Unexpected end of file.") then I realize that this file const legacyGlobalConfigPath = path.join(homeDir, '.angular-cli.json') was used and when I take a look it was empty, so the error is consistent with a bad json parsing, but at least will be good if we had the filename in the error