WARNING in ./src/app/app.module.ngfactory.js Angularfirestore

[ericel]

I am getting this error when I tried to build for production. ng build --prod --aot

 "angularfire2": "^5.0.0-rc.6",
 "@angular/compiler-cli": "^5.2.0",
"@angular/cli": "~1.7.0",

WARNING in ./src/app/app.module.ngfactory.js
110:18734-18740 "export 'ɵa' (imported as 'i47') was not found in 'angularfire2/firestore'

Works well with development ng serve.

[ericel]

this happens when target is set to "target": "es6",

[byrondover]

I too am experiencing this AOT warning.

% ng --version

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

Angular CLI: 1.7.1
Node: 8.9.1
OS: darwin x64
Angular: 5.2.6
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

@angular/cdk: 5.2.2
@angular/cli: 1.7.1
@angular/flex-layout: 2.0.0-beta.12
@angular/material: 5.2.2
@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: 1.10.1
@schematics/angular: 0.3.2
@schematics/package-update: 0.3.2
typescript: 2.6.2
webpack-bundle-analyzer: 2.10.1
webpack: 3.11.0