我正在尝试将应用程序部署到Heroku。它正在正确构建（使用heroku nodejs buildpack），但是我无法访问Heroku的环境变量。这是正在使用的环境文件：
import * as process from 'process'
console.log(process); // Object containing numerous props (cwd, chdir, browser, etc.)
console.log(process.env); // Empty object but NOT undefined
console.log(process.env.BACKEND_URL); // Undefined
export const environment = {
production: true,
baseUrl: process.env.BACKEND_URL,
apiBaseUrl: process.env.BACKEND_URL + '/api/v1/',
cmsBaseUrl: process.env.BACKEND_URL + '/content/pages/',
verboseApiCalls: false
};
正在运行的构建命令：
"postinstall": "ng build --aot --prod && npm install -g serve",
Angular.json：
{
"$schema": "./node_modules/@angular/cli/lib/config/schema.json",
"version": 1,
"newProjectRoot": "projects",
"projects": {
"front-end": {
"root": "",
"sourceRoot": "src",
"projectType": "application",
"prefix": "app",
"schematics": {},
"architect": {
"build": {
"builder": "@angular-devkit/build-angular:browser",
"options": {
"outputPath": "dist/front-end",
"index": "src/index.html",
"main": "src/main.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.app.json",
"assets": [
"src/favicon.ico",
"src/assets"
],
"stylePreprocessorOptions": {
"includePaths": [
"src/assets/styles/partials"
]
},
"styles": [
"src/styles-app-loading.scss",
"src/assets/styles/catch.scss",
"src/styles.css"
],
"scripts": []
},
"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
},
"local": {
"fileReplacements": [
{
"replace": "src/environments/environment.ts",
"with": "src/environments/environment.local.ts"
}
],
"optimization": false,
"outputHashing": "all",
"sourceMap": false,
"extractCss": true,
"namedChunks": false,
"aot": false,
"extractLicenses": true,
"vendorChunk": false,
"buildOptimizer": false
}
}
},
"serve": {
"builder": "@angular-devkit/build-angular:dev-server",
"options": {
"browserTarget": "front-end:build",
"disableHostCheck": true
},
"configurations": {
"production": {
"browserTarget": "front-end:build:production"
},
"local": {
"browserTarget": "front-end:build:local"
}
}
},
"extract-i18n": {
"builder": "@angular-devkit/build-angular:extract-i18n",
"options": {
"browserTarget": "front-end:build"
}
},
"test": {
"builder": "@angular-devkit/build-angular:karma",
"options": {
"main": "src/test.ts",
"polyfills": "src/polyfills.ts",
"tsConfig": "src/tsconfig.spec.json",
"karmaConfig": "src/karma.conf.js",
"styles": [
"src/styles.css"
],
"stylePreprocessorOptions": {
"includePaths": [
"src/assets/styles/partials"
]
},
"scripts": [],
"assets": [
"src/favicon.ico",
"src/assets"
]
}
},
"lint": {
"builder": "@angular-devkit/build-angular:tslint",
"options": {
"tsConfig": [
"src/tsconfig.app.json",
"src/tsconfig.spec.json"
],
"exclude": [
"**/node_modules/**"
]
}
}
}
},
"front-end-e2e": {
"root": "e2e/",
"projectType": "application",
"architect": {
"e2e": {
"builder": "@angular-devkit/build-angular:protractor",
"options": {
"protractorConfig": "e2e/protractor.conf.js",
"devServerTarget": "front-end:serve"
},
"configurations": {
"production": {
"devServerTarget": "front-end:serve:production"
}
}
},
"lint": {
"builder": "@angular-devkit/build-angular:tslint",
"options": {
"tsConfig": "e2e/tsconfig.e2e.json",
"exclude": [
"**/node_modules/**"
]
}
}
}
}
},
"defaultProject": "front-end"
}
Package.json ：（真的不知道它是否相关）
{
"name": "front-end",
"version": "0.1.0",
"scripts": {
"ng": "ng",
"build": "ng build",
"test": "ng test",
"postinstall": "ng build --aot --prod && npm install -g serve",
"start": "serve dist/front-end/ -l $PORT",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/animations": "^7.1.3",
"@angular/cdk": "^7.1.1",
"@angular/cli": "~7.1.2",
"@angular/common": "^7.1.3",
"@angular/compiler": "^7.1.3",
"@angular/core": "^7.1.3",
"@angular/flex-layout": "^7.0.0-beta.21",
"@angular/forms": "^7.1.3",
"@angular/http": "^7.1.3",
"@angular/material": "^7.1.1",
"@angular/platform-browser": "^7.1.3",
"@angular/platform-browser-dynamic": "^7.1.3",
"@angular/router": "^7.1.3",
"@swimlane/ngx-charts": "^10.0.0",
"classlist.js": "^1.1.20150312",
"core-js": "^2.5.4",
"rxjs": "^6.0.0",
"typescript": "~3.1.6",
"zone.js": "^0.8.26"
},
"devDependencies": {
"@angular-devkit/build-angular": "^0.13.2",
"@angular/cli": "~7.1.2",
"@angular/compiler-cli": "^7.2.5",
"@angular/language-service": "^7.1.3",
"@types/jasmine": "~2.8.6",
"@types/jasminewd2": "~2.0.3",
"@types/node": "~8.9.4",
"codelyzer": "~4.2.1",
"jasmine-core": "~2.99.1",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~1.7.1",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "~2.0.0",
"karma-jasmine": "~1.1.1",
"karma-jasmine-html-reporter": "^0.2.2",
"karma-spec-reporter": "0.0.32",
"protractor": "^5.4.1",
"ts-node": "~5.0.1",
"tslint": "~5.9.1",
"typescript": "~3.1.6"
},
"engines": {
"node": "10.3.0"
}
}
我尝试了this的答案，但是在任何地方都找不到引用的模块。我真的不知道在哪里看，所以将不胜感激。
答案 0 :(得分：0)
您可以使用app.json文件（doc）。 当您要将应用程序部署到Heroku时，将读取app.json并设置env变量。此外，您可以指定要执行的构建，附加组件（例如postgres）和后脚本命令。 这是您的项目的示例：
{
"name": "Example",
"description": "This app does one little thing",
"success_url": "/",
"scripts": {
"postdeploy": "database create && database update"
},
"env": {
"production": "true",
"verboseApiCalls": "false"
}
}
另一步:)，我将我的app.json推送到远程存储库（github）上，并使用following url来部署应用程序：
https://heroku.com/deploy?template=https://github.com/yourNameOrOrganisation/yourRepository
也不要忘记添加Procfile。 希望能有所帮助;）