ng build/serve --prod breaks @angular/common/http

[buu700]

Versions

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


Angular CLI: 6.0.0-rc.10
Node: 9.11.1
OS: darwin x64
Angular: 6.0.0-rc.6
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.5.13
@angular-devkit/build-angular     0.5.13
@angular-devkit/build-optimizer   0.5.13
@angular-devkit/core              0.5.13
@angular-devkit/schematics        0.5.13
@angular/cli                      6.0.0-rc.10
@ngtools/webpack                  6.0.0-rc.11
@schematics/angular               0.5.13
@schematics/update                0.5.13
rxjs                              6.0.0
typescript                        2.7.2
webpack                           4.6.0

Repro steps

• git clone https://github.com/buu700/ng6-http-test.git
• cd ng6-http-test
• npm install .
• ng serve --prod

This project is a small modification of ng new's output which runs the following:

this.httpClient.request(
	new HttpRequest('GET', 'https://na.cdn.cyph.com/cyph.ws/current')
).subscribe(event => {
	console.log({event});
});

Observed behavior

Logged to console:

{event: {type: undefined}}
{event: {
	body: 1524888620241,
	headers: e {normalizedNames: Map(0), lazyUpdate: null, lazyInit: ƒ},
	ok: true,
	status: 200,
	statusText: "OK",
	type: undefined,
	url: "https://na.cdn.cyph.com/cyph.ws/current"
}}

Desired behavior

As when building/serving without --prod, HttpEvent.type should be defined.

Mention any other details that might be useful (optional)

Also reproduced with CLI version 6.0.0-rc.7.

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