How to check if Angular application running in Production or Development mode
AngularProductionAngular Problem Overview
This seems an easy one, but I couldn't find any solution.
So, how do I check if my app is running in production mode or dev mode?
Angular Solutions
Solution 1 - Angular
You can use this function isDevMode
import { isDevMode } from '@angular/core';
...
export class AppComponent {
constructor() {
console.log(isDevMode());
}
}
One note: be carefull with this function
if(isDevMode()) {
enableProdMode();
}
You will get
> Error: Cannot enable prod mode after platform setup
Other options
environment variable
import { environment } from 'src/environments/environment';
if (environment.production) {
//
}
injected by webpack process.env.NODE_ENV variable
declare let process: any;
const env = process.env.NODE_ENV;
if (env === 'production') {
//
}
Solution 2 - Angular
Per the Angular Deployment guide at https://angular.io/guide/deployment#enable-production-mode:
> Building for production (or appending the --environment=prod flag)
> enables production mode Look at the CLI-generated main.ts
to see how
> this works.
main.ts
has the following:
import { environment } from './environments/environment';
if (environment.production) {
enableProdMode();
}
So check environment.production
to see if you are in production.
Most likely you do NOT want to call isDevMode()
. Per the Angular API documentation at https://angular.io/api/core/isDevMode:
> After called once, the value is locked and won't change any more... > By default, this is true, unless a user calls enableProdMode before calling this.
I've found that calling isDevMode()
from an ng build --prod
build always returns true and always locks you into running in dev mode. Instead, check environment.production
to see if you are in production. Then you will stay in production mode.
Solution 3 - Angular
it depends on what you are asking...
If you want to know the mode
of Angular, as @yurzui said, you need to call { isDevMode } from @angular/core
but it can return false
only if you call enableProdMode
before it.
If you want to know the build environment, in other words, if your app is running minified or not, you need to set a build variable in your build system... Using Webpack
, for example, you should have a look at definePlugin
.
https://webpack.github.io/docs/list-of-plugins.html#defineplugin
new webpack.DefinePlugin({
ENV_PRODUCTION: !!process.env.NODE_ENV
});
Solution 4 - Angular
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'
import { enableProdMode } from '@angular/core';
import { AppModule } from './app.module'
platformBrowserDynamic().bootstrapModule(AppModule);
enableProdMode();
This was my code, so I got the same error. I just interchanged line 3 and 4. Then the issue is fixed. So before bootstrapping module we should enable --prod mode.
The correct one can be put in this way,
enableProdMode()
platformBrowserDynamic().bootstrapModule(AppModule);
Solution 5 - Angular
Simply check the production variable present in the environment file, it will be true for production mode and false for development.
import { environment } from 'src/environments/environment';
if (environment.production) {
// for production
} else {
// for development
}
Solution 6 - Angular
You should be careful that you check the return value of the isDevMode()
function.
My setup was failing because i was checking for existence: if (isDevMode)
was always true
, even in production because i declared it with import { isDevMode } from '@angular/core';
.
if (isDevMode())
returned false
correctly.