Building a Weather App Using React.js and Bootstrap

TypeScript, with its static typing and enhanced developer experience, has become a go-to choice for many JavaScript developers. When working with modules and imports in TypeScript, understanding the difference between 'import' and 'import type' becomes crucial. In this exclusive article, we'll explore the nuances of these two import statements, providing insights into their distinct use cases and how they contribute to robust and type-safe code.

1. The Basics: 'import' Statement:
   The 'import' statement in TypeScript is fundamental for bringing in modules and their associated types. When you use 'import', you import both the runtime values (such as objects, functions, or classes) and their types. It's the default way of importing in TypeScript and is suitable for scenarios where both runtime and type information are necessary.

2. 
   

3. When to Use 'import':

   • Importing Values and Types: If you need to use both the runtime values and types from a module, stick with the standard 'import' statement.
   • Mixing Values and Types in the Same Import: When you want to import values and types in the same statement, 'import' is the way to go. This is useful in scenarios where the values and types are tightly coupled.
   • 
     

4. Introducing 'import type':
   TypeScript 3.8 introduced a new syntax, 'import type', providing a way to import only the types from a module, excluding the runtime values. This can lead to more efficient code in certain situations, especially when you want to avoid unnecessary runtime overhead associated with importing values.

5. 
   

6. When to Use 'import type':

   • Type-Only Imports: If you are only interested in importing the types from a module and want to exclude the runtime values, 'import type' is the appropriate choice.
   • Reducing Bundle Size: When optimizing for smaller bundle sizes, using 'import type' can help eliminate unnecessary runtime code, resulting in a more lightweight application.
   • 
     

7. Benefits of 'import type':

   • Eliminating Runtime Overhead: By using 'import type', you ensure that only type information is included in your final bundle, reducing the overall size of your application.
   • Avoiding Potential Side Effects: In scenarios where importing values might have unintended side effects (like triggering certain code execution), 'import type' provides a safer alternative.
   • 
     

8. Limitations of 'import type':

   • Runtime Values Excluded: The primary limitation is that 'import type' excludes the actual runtime values. If you need both values and types, resort to the traditional 'import' statement.
   • 
     

9. Examples and Use Cases:

• Standard Import:
• import { Component, createElement } from 'react';
10. Type-Only Import:
11. import type { ReactElement } from 'react';
12. 
    

13. Best Practices:

    • Use 'import' for Values and Types: If you need both values and types from a module, stick to the standard 'import'.
    • Opt for 'import type' for Type-Only Scenarios: When you are solely interested in importing types and want to reduce bundle size, leverage 'import type'.
    • Consistency in Codebase: Maintain consistency in your codebase. Choose the appropriate import statement based on your needs, and apply it consistently across your project.

Conclusion:



In the TypeScript ecosystem, choosing between 'import' and 'import type' is about striking the right balance between obtaining runtime values and optimizing for type-only scenarios. By understanding their differences and use cases, developers can leverage these import statements strategically, contributing to cleaner, more efficient, and type-safe TypeScript code. As you navigate your TypeScript projects, consider the nature of your imports and tailor your choices between 'import' and 'import type' accordingly.
14.