ng build run twice ? (angular 8.1.1)

🐞 bug report

Affected Package

The issue is caused by package @angular/....

Ng Build run twice ? is it normal ?

Is this a regression?

Yes, the previous version in which this bug was not present was: ....

just upgraded to v 8. v7 just compiled and build once.

Description

A clear and concise description of the problem...

I just make a build.bat and run it. build.bat contains ng b --prod --output-path …/crsappbuild/dest --base-href /

🔬 Minimal Reproduction

https://stackblitz.com/...

🔥 Exception or Error

🌍 Your Environment

Angular Version:

Angular CLI: 8.1.1
Node: 10.13.0
OS: win32 x64
Angular: 8.1.0
... common, compiler, core, forms, language-service
... platform-browser, platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.801.1
@angular-devkit/build-angular     0.801.1
@angular-devkit/build-optimizer   0.801.1
@angular-devkit/build-webpack     0.801.1
@angular-devkit/core              8.1.1
@angular-devkit/schematics        8.1.1
@angular/animations               8.1.1
@angular/cdk                      7.3.7
@angular/cli                      8.1.1
@angular/compiler-cli             8.1.1
@angular/material                 7.3.7
@ngtools/webpack                  8.1.1
@schematics/angular               8.1.1
@schematics/update                0.801.1
rxjs                              6.5.2
typescript                        3.4.5
webpack                           4.35.2

Anything else relevant?

[santoshyadavdev]

This is a feature called differential loading. Now we generate 2 bundles for es5 and es2015 respectively to serve smalled bundles on new browsers.

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