<!-- IF YOU DON'T FILL OUT THE FOLLOWING INFORMATION YOUR ISSUE MIGHT BE CLOSED WITHOUT INVESTIGATING --> ### Bug Report or Feature Request (mark with an `x`) ``` - [custom hash in cache busting ] feature request ``` ### Versions. <!-- Output from: `ng --version`. If nothing, output from: `node --version` and `npm --version`. Windows (7/8/10). Linux (incl. distribution). macOS (El Capitan? Sierra?) --> ### Repro steps. <!-- Simple steps to reproduce this bug. Please include: commands run, packages added, related code changes. A link to a sample repo would help too. --> ### The log given by the failure. <!-- Normally this include a stack trace and some more information. --> ### Desired functionality. Required is custom hashes for cache busting ### Mention any other details that might be useful. <!-- Please include a link to the repo if this is related to an OSS project. -->