Applying SOLID To React

SOLID principles were designed to assist in the longevity of your code but are difficult to learn and even more difficult to apply in front-end development. Use this article as an easy reference on how to start integrating the SOLID principles into your React+Typescript project.

Each of them must have a reason to change.

Good Practice: Focus components on a single task.

Example:

• The UserCard component displays user information.

• Another UserList component is used to render many UserCard components.

Components should be open to extension but closed to modification.

Good Practice: Use props, higher-order components (HOCs), or hooks to make it extensible.

Example:

• A Button component that is styleable through props (variant="primary" or secondary).

Subtypes should be substitutable for their base types.

Good Practice: Components that are reusable should not fail when replaced by extended versions.

Example:

• A BaseInput can be replaced by a TextInput or PasswordInput without altering behavior.

Don't have elements depend on unused props or functionality.

Good Practice: Split large props interfaces into small, specialized ones.

Example:

• Independent interfaces for a Form component and a Button, without redundant props being passed through.

High-level modules cannot depend on low-level modules; they must both depend on abstractions.

Good Practice: Use hooks, context, or dependency injection.

Example:

• A UserList component is dependent on a useUserData hook rather than retrieving data directly in the component.

Applying SOLID principles to React results in maintainable, clean, and scalable code. It makes code more flexible, testable, and long-term project sustainable.

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