Introduction to Requizzle

Requizzle is a powerful library for JavaScript that allows developers to re-export and modify existing modules effortlessly. This tool can be especially useful for managing dependencies, creating composites of multiple modules, and for mocking during testing. In this guide, we’ll explore the capabilities of Requizzle and provide code snippets for its various APIs.

Installing Requizzle

npm install requizzle

Basic Usage

Let’s start with a basic example of how to use Requizzle to re-export a module:

  const Requizzle = require('requizzle');
  
  const myModule = Requizzle({
    requirePaths: {
      'original-module': './path/to/overridden_module'
    }
  })('original-module');
  
  console.log(myModule);

Advanced API Examples

Using Requizzle with Context Functions

  const myModuleWithContext = Requizzle({
    context: {
      customVar: 42
    }
  })('original-module');

  console.log(myModuleWithContext);

Using Requizzle with Mock Functions

  const myModuleWithMocks = Requizzle({
    requireMocks: {
      'some-dependency': {
        getData: () => ['mockData1', 'mockData2']
      }
    }
  })('original-module');

  console.log(myModuleWithMocks);

Combining Multiple Requizzle Options

  const combinedRequizzle = Requizzle({
    requirePaths: {
      'original-module': './path/to/overridden_module'
    },
    requireMocks: {
      'another-dependency': {
        fetchData: () => ['mockValue']
      }
    },
    context: {
      environment: 'test'
    }
  })('original-module');

  console.log(combinedRequizzle);

App Example Using Requizzle

Below is an example of a simple application using Requizzle with various configurations:

  const Requizzle = require('requizzle');

  const appConfig = Requizzle({
    requirePaths: {
      'config': './config/testConfig'
    },
    requireMocks: {
      'service': {
        getServiceData: () => ['mockServiceData']
      }
    },
    context: {
      isTestEnvironment: true
    }
  })('config');

  const appModule = require('./appModule');
  appModule.init(appConfig);

  console.log('App started with:', appConfig);

Using Requizzle in this way, you can manage different configurations and mocks effortlessly, making your development and testing processes more streamlined.

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