JS & TS Fundamentals
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# Introduction
Dynamic imports are a powerful feature in JavaScript and TypeScript, enabling on-demand loading of modules using the
import() function.Dynamic vs Static imports
Dynamic imports differ from static imports in that they enable you to load modules conditionally.
This feature can be extremely advantageous in situations such as loading different configurations based on the environment (for example, production or development) or enhancing application performance by decreasing the initial load time.
# Dynamic Imports
This example illustrates how to dynamically load modules and configure your application to use different settings based on whether it is in production or development mode. This approach ensures that your application remains both efficient and flexible, adapting to its environment without including unnecessary code.
index.ts
utils/config-dev.ts
utils/config-prod.ts
-
The
import()function is used to dynamically load modules at runtime. Unlike static import statements,import()is asynchronous and returns aPromise, which is whyawaitis used here. -
The
ifstatement checks themodevalue and determines which configuration file to load dynamically. This is useful in scenarios like development vs. production environments, where the app might need different settings or behavior. But can also be useful to load any module at runtime only when necessary.
A similar technique is also used by framework like Angular or React to lazy load routes or components.
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