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New build system application missing i18n strings from templates #31227
Description
Which @angular/* package(s) are the source of the bug?
compiler-cli
Is this a regression?
No
Description
I have opted in to the new build system, this is my angular.json after the upgrade:
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"my-lib": {
"projectType": "application",
"schematics": {
"@schematics/angular:component": {
"style": "scss"
},
"@schematics/angular:application": {
"strict": true
}
},
"root": "",
"sourceRoot": "src",
"prefix": "app",
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:application",
"options": {
"outputPath": {
"base": "dist/my-lib"
},
"i18nMissingTranslation": "ignore",
"deleteOutputPath": true,
"index": "src/index.html",
"polyfills": [
"@angular/localize/init",
"src/polyfills.ts"
],
"tsConfig": "tsconfig.app.json",
"inlineStyleLanguage": "scss",
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.scss"
],
"scripts": [
"./node_modules/quill/dist/quill.min.js"
],
"stylePreprocessorOptions": {
"includePaths": [
"node_modules",
"src/app"
]
},
"allowedCommonJsDependencies": [
"@uppy/core",
"@uppy/tus",
"url-parse",
"lodash",
"namespace-emitter",
"classnames",
"is-shallow-equal",
"cropperjs",
"quill",
"ts-deepmerge"
],
"browser": "src/main.ts"
},
"configurations": {
"production": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"outputHashing": "all"
},
"development": {
"aot": false,
"optimization": false,
"extractLicenses": false,
"sourceMap": true,
"namedChunks": true
}
},
"defaultConfiguration": "development"
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"configurations": {
"production": {
"buildTarget": "my-lib:build:production"
},
"development": {
"buildTarget": "my-lib:build:development"
}
},
"defaultConfiguration": "development",
"options": {
"sslCert": "./node_modules/browser-sync/certs/server.crt",
"sslKey": "./node_modules/browser-sync/certs/server.key",
"ssl": true,
"liveReload": false
}
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"buildTarget": "my-lib:build"
}
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"main": "src/test/test.ts",
"tsConfig": "tsconfig.spec.json",
"karmaConfig": "karma.conf.js",
"styles": [
"src/styles.scss"
],
"stylePreprocessorOptions": {
"includePaths": [
"node_modules",
"src/app"
]
}
}
}
}
}
},
"cli": {
"analytics": false
}
}The project is serving and building but when I try to extract the translation strings with:
ng extract-i18n --format=json
At the end I get:
Extraction Complete. (Messages: 713)
In fact with my previous setup:
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"my-lib": {
"projectType": "application",
"schematics": {
"@schematics/angular:component": {
"style": "scss"
},
"@schematics/angular:application": {
"strict": true
}
},
"root": "",
"sourceRoot": "src",
"prefix": "app",
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/my-lib",
"i18nMissingTranslation": "ignore",
"deleteOutputPath": true,
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "tsconfig.app.json",
"inlineStyleLanguage": "scss",
"assets": [
"src/favicon.ico",
"src/assets"
],
"styles": [
"src/styles.scss"
],
"scripts": [
"./node_modules/quill/dist/quill.min.js"
],
"stylePreprocessorOptions": {
"includePaths": [
"node_modules",
"src/app"
]
},
"allowedCommonJsDependencies": [
"@uppy/core",
"@uppy/tus",
"url-parse",
"lodash",
"namespace-emitter",
"classnames",
"is-shallow-equal",
"cropperjs",
"quill",
"ts-deepmerge"
]
},
"configurations": {
"production": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.prod.ts"
}
],
"outputHashing": "all"
},
"development": {
"aot": false,
"buildOptimizer": false,
"optimization": false,
"vendorChunk": true,
"extractLicenses": false,
"sourceMap": true,
"namedChunks": true
}
},
"defaultConfiguration": "development"
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"configurations": {
"production": {
"buildTarget": "my-lib:build:production"
},
"development": {
"buildTarget": "my-lib:build:development"
}
},
"defaultConfiguration": "development",
"options": {
"sslCert": "./node_modules/browser-sync/certs/server.crt",
"sslKey": "./node_modules/browser-sync/certs/server.key",
"ssl": true,
"liveReload": false
}
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"buildTarget": "my-lib:build"
}
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"main": "src/test/test.ts",
"tsConfig": "tsconfig.spec.json",
"karmaConfig": "karma.conf.js",
"styles": [
"src/styles.scss"
],
"stylePreprocessorOptions": {
"includePaths": [
"node_modules",
"src/app"
]
}
}
}
}
}
},
"cli": {
"analytics": false
}
}The same i18n extraction command gets me:
Extraction Complete. (Messages: 1602)
I notices that with the application builder translations are missing from the component html templates, while $localization used inside TS files are recognized.
Please provide a link to a minimal reproduction of the bug
No response
Please provide the exception or error you saw
Please provide the environment you discovered this bug in (run ng version)
Angular CLI: 20.3.1
Node: 20.19.5
Anything else?
No response
Activity
alan-agius4 commentedon Sep 17, 2025
This seems like a bug but we'll need to look at a reproduction to find and fix the problem. Can you setup a minimal repro please?
You can read here why this is needed. A good way to make a minimal repro is to create a new app via
ng new repro-appand adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.This might be related to your directory structure so its really important to get an accurate repro to diagnose this.
Xriuk commentedon Sep 17, 2025
Here's the repro: https://github.com/Xriuk/repro-31227
I found out that the culprit is
architect.build.configurations.development.aotwhich when set to false gets treated differently by the two build systems, the old and the new one. If I set it to true it works in the new build system too, but when false it just seems to ignore HTML template translation strings.Xriuk commentedon Sep 17, 2025
Also I am noticing that with aot = true it's still behaving a bit differently in my original project, as I get:
Looking at the strings left out it seems that they are localizations which are imported but not used, so it seems some optimization of the AOT compiler, so it shouldn't be a big deal, but just to let you know.
clydin commentedon Sep 17, 2025
The later is expected behavior. Only strings used within an application are extracted for translation. Translation costs can be significant for large applications and translating strings that are not actually part of the shipped application can unduly increase those costs.