When developing applications in TypeScript, you may come across scenarios where you need to conditionally import modules based on certain conditions. This can be useful, for example, when dealing with different environments or feature flags.

In TypeScript, you can achieve conditional module imports using the dynamic import() syntax and the import type statement.

Here’s an example of how you can conditionally import a module based on a condition:

import type { SettingsConfig } from './settings';

if (process.env.NODE_ENV === 'development') {
  import('./developmentSettings').then((settings: SettingsConfig) => {
    // Use the development settings
  }).catch((error) => {
    console.error('Error loading development settings', error);
  });
} else {
  import('./productionSettings').then((settings: SettingsConfig) => {
    // Use the production settings
  }).catch((error) => {
    console.error('Error loading production settings', error);
  });
}

In this example, we import the SettingsConfig type from the settings module. Then, by checking the value of the process.env.NODE_ENV variable, we conditionally import the appropriate module.

Note that when using the dynamic import() syntax, TypeScript infers the type of the imported module using the import type statement. This allows you to use the module’s types and avoid introducing unnecessary dependencies.

By using conditional module imports, you can keep your codebase clean and modular, adapting it based on different environments or feature toggles without cluttering your code with unnecessary imports.

Remember to update your TypeScript configuration (tsconfig.json) to include the "esModuleInterop": true option to enable interoperation with CommonJS modules.

These conditional module imports are not limited to environment-based conditions; you can use any condition or flag to determine which module to import dynamically.

Happy coding! #TypeScript #ModuleImports