TypeScript Patterns for Better React Components - Speaker Deck

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@glnnrys · glennreyes.com TypeScript Patterns for Better React Components

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Glenn Reyes @glnnrys · glennreyes.com Software Engineer, Tech Speaker & Workshop Instructor Head of Developer Relations @ Kadena

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Marmelade NFT standard at Kadena Kadena The only PoW blockchain that scales Chainweb A scalable PoW consensus algorithm Remote first & distributed Founded by Stuart Popejoy & Will Martino kadena.js github.com/kadena-community/kadena.js ~ 30 developers in DX team ~ 70 employees Pact The human-readable smart contract language

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@glnnrys React

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@glnnrys Typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React

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@glnnrys History of typing in React ❓

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@glnnrys History of typing in React 🤖

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@glnnrys From the beginning …

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@glnnrys TypeScript has been tightly integrated with Angular and Vue

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@glnnrys But not with React 🫠

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@glnnrys Today, TypeScript is not tightly integrated with React.

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@glnnrys

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@glnnrys DefinitelyTyped on GitHub TypeScript types for React are purely driven by the community.

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@glnnrys @types/react @types/react-dom

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@glnnrys Patterns

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@glnnrys Boolean props

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@glnnrys Boolean props

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@glnnrys Boolean props

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@glnnrys Boolean props

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@glnnrys Boolean props

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@glnnrys String literal union type prop

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@glnnrys String literal union type prop

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@glnnrys String literal unions vs. enums

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@glnnrys String literal unions vs. enums Differences ‣ Distinct types

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@glnnrys String literal unions vs. enums

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@glnnrys String literal unions vs. enums Differences ‣ Runtime overhead with enum →

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@glnnrys String literal unions vs. enums Differences ‣ Runtime overhead with string literal unions →

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@glnnrys Comparison boolean vs. union

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@glnnrys Comparison boolean vs. union vs. custom

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@glnnrys Custom component In comparison to boolean vs. union Predefined logic built-in to the component ‣ Button is tightly integrated with form context ‣ loading and disabled state coming from a form library Appearance identical to the primitive

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@glnnrys Components with HTML element attribute

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@glnnrys

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@glnnrys

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@glnnrys Components with HTML element attributes ‣ React.HTMLAttributes does not include enough types

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@glnnrys Components with HTML element attributes ‣ React.HTMLProps uses AllHTMLAttributes → inaccurate types

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@glnnrys Components with HTML element attributes ‣ JSX.IntrinsicElements errors when inlined

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@glnnrys Components with HTML element attributes • Workaround: JSX.IntrinsicElements wrapped in NonNullable ↓

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@glnnrys Components with HTML element attributes React.ButtonHTMLAttributes

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@glnnrys Components with HTML element attributes

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@glnnrys Components with HTML element attributes

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@glnnrys React.FunctionComponent

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@glnnrys React.FunctionComponent

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@glnnrys React.FunctionComponent Definition (since React 18 ) Usage

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@glnnrys React Server Components

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@glnnrys React Server Components

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@glnnrys React Server Components Async React components are supported since TypeScript 5.1 🚀

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@glnnrys Reusing types and interfaces

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@glnnrys Reusing types and interfaces

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@glnnrys Reusing types and interfaces vs.

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@glnnrys Prefer reusability and keep simplicity on a case-by-case basis.

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@glnnrys Compound and Polymorphic Components A comparison vs.

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@glnnrys Compound and Polymorphic Components A comparison vs. Customization to the icon is managed by the DownloadIcon component itself → Flexibility Customization to the icon is managed by the Icon primitive → Consistency

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@glnnrys Compound Components asChild from radix

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@glnnrys Compound Components asChild from radix

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@glnnrys Compound Components asChild from radix

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@glnnrys Compound Components asChild from radix

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@glnnrys Polymorphic Components

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@glnnrys Polymorphic Components

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@glnnrys Polymorphic Components

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@glnnrys Generic Components

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@glnnrys Generic Components

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@glnnrys Generic Components

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@glnnrys React.forwardRef

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@glnnrys React.forwardRef

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@glnnrys React.forwardRef ?

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@glnnrys React.forwardRef

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@glnnrys React.forwardRef

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@glnnrys React.forwardRef

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@glnnrys React.forwardRef

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@glnnrys React.Context

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@glnnrys React.Context With default values

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@glnnrys React.Context With default values

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@glnnrys React.Context With default values

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@glnnrys React.Context With default values

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@glnnrys React.Context Without default values

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@glnnrys React.Context Without default values

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@glnnrys React.Context Without default values

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@glnnrys Overload function components

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@glnnrys Overload function components

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@glnnrys type vs. interface

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@glnnrys type vs. interface type interface

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@glnnrys Reduced computational work By using interface.

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@glnnrys Prefer interface for faster TS compilation in your editor.

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@glnnrys Encourage type annotations. Especially function return types, for faster compilation

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@glnnrys

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@glnnrys Commenting types is very encouraged.

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@glnnrys Commenting types dayjs Example

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@glnnrys Commenting types dayjs Example

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@glnnrys any

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@glnnrys It’s your friend, but it’s also not. any

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@glnnrys Run time parsing

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@glnnrys any, as and !

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@glnnrys Avoid them all. any, as and !

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@glnnrys any, as and ! Type narrowing with type guards

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@glnnrys any, as and ! Type narrowing with type guards

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@glnnrys any, as and ! Runtime parsing

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@glnnrys Tooling

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@glnnrys Great tooling keeps your codebase clean without the hassle.

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type-fest Tooling ts-pattern esbuild tsx (formerly esno) ts-reset Improved built-in typings bun typescript-eslint eslint-config-banana

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@glnnrys Configuration

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@glnnrys

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@glnnrys

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@glnnrys

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@glnnrys One last thing before we wrap up …

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@glnnrys Glenn Reyes, @glnnrys “Using TypeScript is most fun when the amount of possibilities of errors and edge cases are zero or close to zero.”

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Thank You! @glnnrys · glennreyes.com