Is there a way to extend configurations in angular

问题:

While building my Angular 6 application, I need to specify 2 things at once:

• If it's production or development build
• The locale I'm using

In my angular.json I have:

"build": {
  ...
  "configurations": {
    "production": {
      "fileReplacements": [
        {
          "replace": "src/environments/environment.ts",
          "with": "src/environments/environment.prod.ts"
        }
      ],
      "optimization": true,
      "outputHashing": "all",
      "sourceMap": false,
      "extractCss": true,
      "namedChunks": false,
      "aot": true,
      "extractLicenses": true,
      "vendorChunk": false,
      "buildOptimizer": true
    },
    "pl": {
      "fileReplacements": [
        {
          "replace": "src/assets/i18n/translations.json",
          "with": "src/assets/i18n/pl.json"
        }
      ]
    },
    "en": {
      "fileReplacements": [
        {
          "replace": "src/assets/i18n/translations.json",
          "with": "src/assets/i18n/en.json"
        }
      ]
    }
  }
}

But when I'm doing ng build --configuration=en --configuration=production I'm getting an error Configuration 'en,production' could not be found. I understand it means you can specify only 1 configuration at a time.

This means I need to create separate en, pl, productionEn, productionPl configurations. Though not the cleanest pattern, I can live with that.

"build": {
  ...
  "configurations": {
    "production": {
      "fileReplacements": [
        {
          "replace": "src/environments/environment.ts",
          "with": "src/environments/environment.prod.ts"
        }
      ],
      "optimization": true,
      "outputHashing": "all",
      "sourceMap": false,
      "extractCss": true,
      "namedChunks": false,
      "aot": true,
      "extractLicenses": true,
      "vendorChunk": false,
      "buildOptimizer": true
    },
    "pl": {
      "fileReplacements": [
        {
          "replace": "src/assets/i18n/translations.json",
          "with": "src/assets/i18n/pl.json"
        }
      ]
    },
    "en": {
      "fileReplacements": [
        {
          "replace": "src/assets/i18n/translations.json",
          "with": "src/assets/i18n/en.json"
        }
      ]
    },
    "productionPl": {
      "fileReplacements": [
        {
          "replace": "src/environments/environment.ts",
          "with": "src/environments/environment.prod.ts"
        },
        {
          "replace": "src/assets/i18n/translations.json",
          "with": "src/assets/i18n/pl.json"
        }
      ],
      "optimization": true,
      "outputHashing": "all",
      "sourceMap": false,
      "extractCss": true,
      "namedChunks": false,
      "aot": true,
      "extractLicenses": true,
      "vendorChunk": false,
      "buildOptimizer": true
    },
    "productionEn": {
      "fileReplacements": [
        {
          "replace": "src/environments/environment.ts",
          "with": "src/environments/environment.prod.ts"
        },
        {
          "replace": "src/assets/i18n/translations.json",
          "with": "src/assets/i18n/en.json"
        }
      ],
      "optimization": true,
      "outputHashing": "all",
      "sourceMap": false,
      "extractCss": true,
      "namedChunks": false,
      "aot": true,
      "extractLicenses": true,
      "vendorChunk": false,
      "buildOptimizer": true
    }
  }
}

But what I can't live with is copying and pasting the whole production configuration contents into productionEn and productionPl. If I add even more locales, or some third separate aspect that I'd like to specify during build, this pattern would become a total nightmare to maintain. Unfortunately it seem it's the pattern that Angular team recommends in their documentation.

Is there a way to tell Angular CLI that productionEn extends production, so to not duplicate the same configuration code multiple times? Something like the code below:

"build": {
  ...
  "configurations": {
    "production": {
      (...)
    },
    "pl": {
      "extends": "production",
      (...)
    },
    "en": {
      "extends": "production",
      (...)
    }
  }
}

回答1:

Reading through some issues and angular.json documentation, it appears that the options act as the defaults for the project

"architect": {
        "build": {          
          "options": {...}

These are overridden with partial options set in the configurations. From the Angular CLI workspace wiki:

configurations (object): A map of alternative target options.
configurationName (object): Partial options override for this builder.

This issue comment also mentions using configurations as an override

This sounds like all of the defaults for the project can be added to the options object e.g. move any duplicates from production, productionPl to the options: {}, and then add the fileReplacements, and the few other overrides that you require

Note: I have not tested this yet, it's just a suggestion based on the docs and issues

回答2:

are you ask about ?

"scripts": {
    [...]
    "build-i18n": "for lang in en es fr pt; 
       do ng build --config=$lang;
       done"
 }