I was hit by a problem like halting problem of truing machine while using the angular cli as follows.
My script : node --max_old_space_size=4096 ./node_modules/@angular/cli/bin/ng build -e=prod --prod --sourcemap --vendor-chunk=true --build-optimizer

Versions

Angular CLI: 1.7.3
Node: 9.8.0
OS: win32 x64
Angular: 5.2.8
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, platform-server, router

@angular/cli: 1.7.3
@angular-devkit/build-optimizer: 0.3.2
@angular-devkit/core: 0.3.2
@angular-devkit/schematics: 0.3.2
@ngtools/json-schema: 1.2.0
@ngtools/webpack: 1.10.2
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.4.0
webpack-bundle-analyzer: 2.11.1

Repro steps

Use this script : node --max_old_space_size=4096 ./node_modules/@angular/cli/bin/ng build -e=prod --prod --sourcemap --vendor-chunk=true --build-optimizer --stats-json

• Apply the above script to any angular project.
• If we replace --scourcemap with --no-souecemap the problem will not comes.

Observed behavior

The program is running indefinitely.

Desired behavior

The program should halt to say if there is some error in the script.