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One way to incorporate a deployment variable into a JavaScript file is by using a module bundler such as webpack or Rollup. These tools allow you to define environment variables in your build process, which can then be used in your JavaScript code.

To create customized configuration variables depending on the environment, you can use conditional statements in your code that check the value of the environment variable. For example, you can define a variable like NODE_ENV in your build process, and then use it in your JavaScript code like this:

const API_URL = process.env.NODE_ENV === 'production'
  ? 'https://api.production.com'
  : 'https://api.staging.com';

This code checks the value of the NODE_ENV environment variable, and sets the API_URL variable accordingly. If NODE_ENV is set to production, the API_URL variable will be set to https://api.production.com, otherwise it will be set to https://api.staging.com.

Note that in order to use environment variables in your JavaScript code, you need to make sure that they are defined and passed into your application at runtime. This can be achieved by using tools like dotenv or by configuring your hosting environment to set the environment variables for you.