Tips for obtaining a customizable environmental variable document in an angular production build

Question

Tips for obtaining a customizable environmental variable document in an angular production build

The constants service I have maintains all the necessary constants for the application, such as the base URL of the backend.

export class ConstantsService {
  public BACKEND_URL = 'http://10.0.27.176:8000/';
}

This setup is not very flexible because once the project is built, the BACKEND_URL cannot be changed. I need a solution where I can export the BACKEND_URL from a file that is included in the production build, allowing me to modify it post-build as well.

To address this limitation, I tried:

import {environment} from '../environments/environment.prod';
...
export class ConstantsService {
  public BACKEND_URL = environment.url;
}

environment.prod.ts

export const environment = {
  production: true,
  url: 'http://10.0.27.176:8000/';
};

However, the issue I encountered was that the environment.prod.ts file was not present in the build.

If anyone could suggest a way for me to achieve this goal, I would greatly appreciate it.

Edit: Below is my prod build output. The environment.prod.ts file is missing:

Date: 2018-09-11T11:52:10.945Z
Hash: 96c48ccf441d2f7a204f
Time: 9301ms
chunk {scripts} scripts.3af8bf49d802296d8ab1.js (scripts) 174 kB [rendered]
chunk {0} 0.d9c510e0e0d04dde4c78.js () 1.27 kB [rendered]
chunk {1} runtime.a18a7eb7c080a20cb142.js (runtime) 1.84 kB [entry] [rendered]
chunk {2} styles.0260add3f34224e145b6.css (styles) 5.58 kB [initial] [rendered]
chunk {3} polyfills.92108b287fe28032870b.js (polyfills) 59.6 kB [initial] [rendered]
chunk {4} main.4bbca11d5e8a6cdb36c0.js (main) 316 kB [initial] [rendered]

angular typescript

Answer 1

Answer №1

When managing multiple environments, it's crucial to have a system in place that allows for easy configuration editing without the need to rebuild the entire app.

This is especially important in enterprise settings where streamlined deployment processes and consistent build numbers are key. It's also useful when hosting the same app in various locations, such as private cloud scenarios where a one-size-fits-all approach isn't suitable.

To achieve this, we utilize Angular's APP_INITIALIZER to load environment-specific variables during app startup for data retrieval.

For more information, you can refer to the documentation at: https://angular.io/api/core/APP_INITIALIZER

We typically define the URL for fetching data by convention, dropping a .json file with environment-specific settings in the /assets/config/env.json path to be loaded by the initializer.

Answer 2

When managing multiple environments, it's crucial to have a system in place that allows for easy configuration editing without the need to rebuild the entire app.

This is especially important in enterprise settings where streamlined deployment processes and consistent build numbers are key. It's also useful when hosting the same app in various locations, such as private cloud scenarios where a one-size-fits-all approach isn't suitable.

To achieve this, we utilize Angular's APP_INITIALIZER to load environment-specific variables during app startup for data retrieval.

For more information, you can refer to the documentation at: https://angular.io/api/core/APP_INITIALIZER

We typically define the URL for fetching data by convention, dropping a .json file with environment-specific settings in the /assets/config/env.json path to be loaded by the initializer.

Answer 3

Answer №2

Have you compiled using the --prod flag? Verify your build settings to ensure that environment.ts is correctly replaced with environment.prod.ts

Answer 4

Have you compiled using the --prod flag? Verify your build settings to ensure that environment.ts is correctly replaced with environment.prod.ts

Answer 5

Answer №3

When you develop a class, it's essential to instantiate it.

For example, here's what it could look like:

export const settings = {
  isProduction: true,
  ...new ConfigService('http://10.0.27.176:8000/')
};

export class ConfigService {
  constructor(public SERVER_URL: string) {}
}

It's important to understand that constants in programming mean that the memory reference of a variable cannot be changed. For instance, if you do:

const y = 1;
y = 2; // This would throw an error

However, when dealing with objects, you are modifying a single memory reference. So technically, you can do something like this (even though it's not recommended):

expont const settings = {
  isProduction: false
}

settings.isProduction = true;

To address your query fully, environment files come into play during the build process of your application. It is advisable to always import the default one (environment.ts).

During the build phase, you can specify which environment file to use using command line parameters.

In Angular 5:

ng build --env prod

In Angular 6:

ng build -c prod

This allows you to switch out the default environment file with the desired one. While prod is a standard environment, you have the flexibility to create additional ones in your angular[-cli].json configuration file.

Answer 6

When you develop a class, it's essential to instantiate it.

For example, here's what it could look like:

export const settings = {
  isProduction: true,
  ...new ConfigService('http://10.0.27.176:8000/')
};

export class ConfigService {
  constructor(public SERVER_URL: string) {}
}

It's important to understand that constants in programming mean that the memory reference of a variable cannot be changed. For instance, if you do:

const y = 1;
y = 2; // This would throw an error

However, when dealing with objects, you are modifying a single memory reference. So technically, you can do something like this (even though it's not recommended):

expont const settings = {
  isProduction: false
}

settings.isProduction = true;

To address your query fully, environment files come into play during the build process of your application. It is advisable to always import the default one (environment.ts).

During the build phase, you can specify which environment file to use using command line parameters.

In Angular 5:

ng build --env prod

In Angular 6:

ng build -c prod

This allows you to switch out the default environment file with the desired one. While prod is a standard environment, you have the flexibility to create additional ones in your angular[-cli].json configuration file.

Answer 7

Answer №4

I couldn't find a solution for what I needed, so I took matters into my own hands.

To start, create two files, config.js and config.prod.js, in your src folder.

var BASE_API_URL = 'X';

Next, modify the angular.json file by adding the following code snippet to the appropriate environment's fileReplacements array:

              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                },
                {
                  "replace": "src/config.js",
                  "with": "src/config.prod.js"
                }
              ],

Add src/config.js to the assets array in the angular.json file as well:

            "assets": [
              "src/assets",
              "src/config.js",
              "src/Web.config"
            ],

Insert

<script src="config.js"></script>

into your index.html file.

Lastly, build the project. You should now have an editable config.js file in the dist folder.

Answer 8

I couldn't find a solution for what I needed, so I took matters into my own hands.

To start, create two files, config.js and config.prod.js, in your src folder.

var BASE_API_URL = 'X';

Next, modify the angular.json file by adding the following code snippet to the appropriate environment's fileReplacements array:

              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                },
                {
                  "replace": "src/config.js",
                  "with": "src/config.prod.js"
                }
              ],

Add src/config.js to the assets array in the angular.json file as well:

            "assets": [
              "src/assets",
              "src/config.js",
              "src/Web.config"
            ],

Insert

<script src="config.js"></script>

into your index.html file.

Lastly, build the project. You should now have an editable config.js file in the dist folder.

Answer 9

Answer №5

It is recommended to import from environment.ts, which can be swapped out at build time for different configurations.

To utilize environment.prod.ts, you can either execute ng build --prod or

ng build --configuration=production

. In your angular.json file, you will find the following section:

"configurations": {
    "production": {
      "fileReplacements": [
        {
          "src": "src/environments/environment.ts",
          "replaceWith": "src/environments/environment.prod.ts"
        }
      ],
      "optimization": true,
      "outputHashing": "all",
      "sourceMap": false,
      "extractCss": true,
      "namedChunks": false,
      "aot": true,
      "extractLicenses": true,
      "vendorChunk": false,
      "buildOptimizer": true
    }
  }

You can also create custom configurations. For instance, if you have an environment.test.ts file, you could use it like this:

    "test": {
      "fileReplacements": [
        {
          "src": "src/environments/environment.ts",
          "replaceWith": "src/environments/environment.test.ts"
        }
      ],
      "optimization": false,
      "outputHashing": "none",
      "sourceMap": false,
      "extractCss": false,
      "namedChunks": false,
      "aot": false,
      "extractLicenses": false,
      "vendorChunk": false,
      "buildOptimizer": false
    }

In your environment.test.ts file -

export const environment = {
  production: false, // This way, you do not need to enable production mode during development
  url: 'http://10.0.27.176:8000/';
};

Answer 10

It is recommended to import from environment.ts, which can be swapped out at build time for different configurations.

To utilize environment.prod.ts, you can either execute ng build --prod or

ng build --configuration=production

. In your angular.json file, you will find the following section:

"configurations": {
    "production": {
      "fileReplacements": [
        {
          "src": "src/environments/environment.ts",
          "replaceWith": "src/environments/environment.prod.ts"
        }
      ],
      "optimization": true,
      "outputHashing": "all",
      "sourceMap": false,
      "extractCss": true,
      "namedChunks": false,
      "aot": true,
      "extractLicenses": true,
      "vendorChunk": false,
      "buildOptimizer": true
    }
  }

You can also create custom configurations. For instance, if you have an environment.test.ts file, you could use it like this:

    "test": {
      "fileReplacements": [
        {
          "src": "src/environments/environment.ts",
          "replaceWith": "src/environments/environment.test.ts"
        }
      ],
      "optimization": false,
      "outputHashing": "none",
      "sourceMap": false,
      "extractCss": false,
      "namedChunks": false,
      "aot": false,
      "extractLicenses": false,
      "vendorChunk": false,
      "buildOptimizer": false
    }

In your environment.test.ts file -

export const environment = {
  production: false, // This way, you do not need to enable production mode during development
  url: 'http://10.0.27.176:8000/';
};

Tips for obtaining a customizable environmental variable document in an angular production build

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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