how to build angular app in different env variable on prod code example

Example 1: adding prod environment file in angular8

content_copy
      
      export const environment = {
  production: false,
  apiUrl: 'http://my-api-url'
};

Example 2: adding prod environment file in angular8

content_copy
      
      {
  "/api": {
    "target": "http://localhost:3000",
    "secure": false,
    "pathRewrite": {
      "^/api": ""
    }
  }
}