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Showing content from https://github.com/fastify/fastify-type-provider-typebox below:

fastify/fastify-type-provider-typebox: A Type Provider for Typebox

A Type Provider for Typebox.

npm i @sinclair/typebox # Required as peer dependency
npm i @fastify/type-provider-typebox

Please note that if a Fastify version is out of support, then so are the corresponding versions of this plugin in the table above. See Fastify's LTS policy for more details.

This package provides enhanced support for TypeBox by integrating it with the Fastify Type Provider infrastructure. It provides a re-export of the TypeBox Type.* builder for convenience as well as providing additional utility types and optional validation infrastructure that can be useful when leveraging TypeBox with Fastify.

import Fastify from 'fastify'
import { Type, TypeBoxTypeProvider } from '@fastify/type-provider-typebox'

const fastify = Fastify().withTypeProvider<TypeBoxTypeProvider>()

Note that the following will not work:

import Fastify from 'fastify'
import { Type, TypeBoxTypeProvider } from '@fastify/type-provider-typebox'

const fastify = Fastify()

fastify.withTypeProvider<TypeBoxTypeProvider>()

import Fastify from 'fastify'
import { TypeBoxTypeProvider } from '@fastify/type-provider-typebox'

// This package re-export Typebox package
// but you can also use any builders imported
// directly from @sinclair/typebox
import { Type } from '@sinclair/typebox'


const fastify = Fastify().withTypeProvider<TypeBoxTypeProvider>()

fastify.post('/', {
  schema: {
    body: Type.Object({
      x: Type.String(),
      y: Type.Number(),
      z: Type.Boolean()
    })
  }
}, (req) => {
  // The `x`, `y`, `z` types are automatically inferred
  const { x, y, z } = req.body
})

import type { TypeBoxTypeProvider } from '@fastify/type-provider-typebox';
import { Type } from '@fastify/type-provider-typebox';
import type {
  ContextConfigDefault,
  FastifyBaseLogger,
  FastifyInstance,
  FastifyReply,
  FastifyRequest,
  RawReplyDefaultExpression,
  RawRequestDefaultExpression,
  RawServerDefault,
} from 'fastify';
import type { RouteGenericInterface } from 'fastify/types/route';
import type { FastifySchema } from 'fastify/types/schema';

export type FastifyTypeBox = FastifyInstance<
  RawServerDefault,
  RawRequestDefaultExpression,
  RawReplyDefaultExpression,
  FastifyBaseLogger,
  TypeBoxTypeProvider
>;

export type FastifyRequestTypeBox<TSchema extends FastifySchema> = FastifyRequest<
  RouteGenericInterface,
  RawServerDefault,
  RawRequestDefaultExpression,
  TSchema,
  TypeBoxTypeProvider
>;

export type FastifyReplyTypeBox<TSchema extends FastifySchema> = FastifyReply<
  RouteGenericInterface,
  RawServerDefault,
  RawRequestDefaultExpression,
  RawReplyDefaultExpression,
  ContextConfigDefault,
  TSchema,
  TypeBoxTypeProvider
>;

export const CreateProductSchema = {
  body: Type.Object({
    name: Type.String(),
    price: Type.Number(),
  }),
  response: {
    201: Type.Object({
      id: Type.Number(),
    }),
  },
};

export const CreateProductHandler = (
  req: FastifyRequestTypeBox<typeof CreateProductSchema>,
  reply: FastifyReplyTypeBox<typeof CreateProductSchema>,
) => {
  // The `name` and `price` types are automatically inferred
  const { name, price } = req.body;

  // The response body type is automatically inferred
  reply.status(201).send({ id: 'string-value' });
  //                       ^? error TS2322: Type 'string' is not assignable to type 'number'.
};

Note When using plugin types, withTypeProvider is not required in order to register the plugin

import { Type, FastifyPluginAsyncTypebox } from '@fastify/type-provider-typebox'

const plugin: FastifyPluginAsyncTypebox = async function(fastify, _opts) {
  fastify.get('/', {
    schema: {
      body: Type.Object({
        x: Type.String(),
        y: Type.Number(),
        z: Type.Boolean()
      })
    }
  }, (req) => {
    /// The `x`, `y`, and `z` types are automatically inferred
    const { x, y, z } = req.body
  });
}

TypeBox provides an optional type compiler that perform very fast runtime type checking for data received on routes. Note this compiler is limited to types expressable through the TypeBox Type.* namespace only. To enable this compiler, you can call .setValidatorCompiler(...) with the TypeBoxValidatorCompiler export provided by this package.

import { Type, TypeBoxTypeProvider, TypeBoxValidatorCompiler } from '@fastify/type-provider-typebox'
import Fastify from 'fastify'

const fastify = Fastify().setValidatorCompiler(TypeBoxValidatorCompiler)

fastify.withTypeProvider<TypeBoxTypeProvider>().get('/', {
  schema: {
    querystring: Type.Object({
      x: Type.String(),
      y: Type.String(),
      z: Type.String()
    })
  }
}, (req) => {
  const { x, y, z } = req.query
})

For additional information on this compiler, please refer to the TypeBox documentation located here.

Licensed under MIT.

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