ng serve --prod Cannot use [chunkhash] or [contenthash]

Versions

Angular CLI: 6.0.0-rc.5
Node: 8.9.1
OS: win32 x64
Angular: 6.0.0-rc.5
... animations, cli, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.5.7
@angular-devkit/build-angular     0.5.7
@angular-devkit/build-optimizer   0.5.7
@angular-devkit/core              0.5.7
@angular-devkit/schematics        0.5.7
@ngtools/json-schema              1.2.0
@ngtools/webpack                  6.0.0-rc.5
@schematics/angular               0.5.7
@schematics/update                0.5.7
rxjs                              6.0.0-uncanny-rc.7
typescript                        2.7.2
webpack                           4.5.0

Repro steps

• Set “hmr”: true under serve options
• ng serve --prod

Observed behavior

****************************************************************************************

Date: 2018-04-20T11:18:32.210Z
Hash: 479da56e19191460642b
Time: 25039ms
chunk {0} admin-admin-module-ngfactory.2293166986b2fdeaaf9e.js (admin-admin-module-ngfactory) 811 bytes  [rendered]
chunk {1}  (runtime) [entry] [rendered]
chunk {2} styles.34c57ab7888ec1573f9c.css (styles) 0 bytes [initial] [rendered]
chunk {3} polyfills.fbe8aa029ddbd67561f0.js (polyfills) 59.4 kB [initial] [rendered]
chunk {4} main.272e4975a98129fc0e4c.js (main) 382 kB [initial] [rendered]

ERROR in chunk runtime [entry]
[name].[chunkhash:20].js
Cannot use [chunkhash] or [contenthash] for chunk in '[name].[chunkhash:20].js' (use [hash] instead)

Desired behavior

No error

[alan-agius4]

Yes, this is still reproducible with 7.1.2, which is sort of indented since using the chunkhash would break HMR.

There are two possible fixes for this.

1. If using hmr with outputHashing we display an appropiate error that states that these 2 options cannot be used together.
2. If running under HMR, we change the contenthash and chunkhash to hash. in https://github.com/angular/angular-cli/blob/2326850374cd393a825e339beb5846afcff87f8a/packages/angular_devkit/build_angular/src/angular-cli-files/models/webpack-configs/utils.ts#L32-L33

[billdwhite]

I was able to get around this by setting “outputHashing”: “none” in my angular.json file. I’m not entirely clear on how that works anyway but it allowed me to keep working until this gets resolved.