ng serve (dev mode) doesn't serve updated file from assets directory

ng serve (dev mode) doesn’t serve updated file from assets directory, it serves “version” that was first transmitted (caching problem?).

When file in assets directory is changed via external shell script (child tsconfig to generate javascript for web workers [tsc + browserify + uglify]), ng serve serves version of file that was transmitted on first request.

Server needs to be restarted for changes to pick-up.

Versions

Angular CLI: 1.6.8
Node: 8.9.3
OS: linux x64
Angular: 5.2.5
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cdk: 5.2.1
@angular/cli: 1.6.8
@angular/flex-layout: 2.0.0-beta.12
@angular/material: 5.2.1
@angular-devkit/build-optimizer: 0.0.42
@angular-devkit/core: 0.0.29
@angular-devkit/schematics: 0.0.52
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.9.8
@schematics/angular: 0.1.17
typescript: 2.5.3
webpack-bundle-analyzer: 2.10.0
webpack: 3.10.0

Repro steps

run ng serve, change some javascript file inside assets directory assets/workers/some.js for example, using above mentioned tools

Observed behavior

ng serve - serves outdated js file which doesn’t exist on storage/drive (caching?)

Desired behavior

To serve updated file from storage.

[MickL]

I can reproduce this on latest version @angular/cli ~6.0.8: A changed file is recognized while new or moved files are not copied to dist.

To reproduce run ng build --watch. After compilation is done place new file into src/assets, or move an existing file -> nothing happens.

[filipesilva]

https://github.com/angular/angular-cli/pull/12591 should fix this by updating the dependency.