Valibot

Valibot is the open source schema library for TypeScript with bundle size, type safety and developer experience in mind.

@gqloom/valibot provides integration of GQLoom with Valibot to weave Valibot Schema into GraphQL Schema.

Installation

npm i @gqloom/core valibot @gqloom/valibot

Defining simple scalars

In GQLoom, you can directly use Valibot schemas as silk:

import * as v from "valibot"
 
const StringScalar = v.string() // GraphQLString
 
const BooleanScalar = v.boolean() // GraphQLBoolean
 
const FloatScalar = v.number() // GraphQLFloat
 
const IntScalar = v.pipe(v.number(), v.integer()) // GraphQLInt

Weave

To ensure that GQLoom correctly weaves Valibot schemas into the GraphQL schema, we need to add the ValibotWeaver from @gqloom/valibot when using the weave function.

import { weave, resolver, query } from "@gqloom/core"
import { ValibotWeaver } from "@gqloom/valibot"
import * as v from "valibot"
 
export const helloResolver = resolver({
  hello: query(v.string(), () => "Hello, World!"),
})
 
export const schema = weave(ValibotWeaver, helloResolver)

Defining objects

We can use Valibot to define objects and use them as [silk] (... /silk) to use:

import * as v from "valibot"
 
export const Cat = v.object({
  __typename: v.nullish(v.literal("Cat")),
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveFish: v.nullish(v.boolean()),
})

Names and more metadata

Defining names for objects

In GQLoom we have multiple ways to define names for objects.

Using `__typename` literal

import * as v from "valibot"
 
export const Cat = v.object({
  __typename: v.nullish(v.literal("Cat")),
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveFish: v.nullish(v.boolean()),
})

In the code above, we used the __typename literal to define the name for the object. We also set the __typename literal to nullish, which means that the __typename field is optional, and if it exists, it must be “Cat”.

import * as v from "valibot"
 
export const Cat = v.object({
  __typename: v.literal("Cat"),
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveFish: v.nullish(v.boolean()),
})

In the code above, we are still using the __typename literal to define the name for the object, but this time we are setting the __typename literal to “Cat”, which means that the __typename field is required and must be “Cat”. The required __typename will be very useful when using GraphQL interface and union.

Using `collectNames`

import * as v from "valibot"
import { collectNames } from "@gqloom/core"
 
export const Cat = v.object({
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveFish: v.nullish(v.boolean()),
})
 
collectNames({ Cat }) // Collect names for Cat, which will be presented in the GraphQL Schema after weaving.

In the above code, we are using the collectNames function to define names for objects. The collectNames function accepts an object whose key is the name of the object and whose value is the object itself.

import * as v from "valibot"
import { collectNames } from "@gqloom/core"
 
export const { Cat } = collectNames({
  Cat: v.object({
    name: v.string(),
    age: v.pipe(v.number(), v.integer()),
    loveFish: v.nullish(v.boolean()),
  }),
})

In the code above, we use the collectNames function to define the names for the objects and deconstruct the returned objects into Cat and export them.

Using `asObjectType`

import * as v from "valibot"
import { asObjectType } from "@gqloom/valibot"
 
export const Cat = v.pipe(
  v.object({
    name: v.string(),
    age: v.pipe(v.number(), v.integer()),
    loveFish: v.nullish(v.boolean()),
  }),
  asObjectType({ name: "Cat" })
)

In the code above, we used the asObjectType function to create a metadata and pass it into the Valibot pipeline to define a name for the object. The asObjectType function takes the complete GraphQL object type definition and returns a metadata.

Add more data

With the asObjectType function, we can add more data to the object, such as description, deprecationReason, extensions and so on.

import * as v from "valibot"
import { asObjectType } from "@gqloom/valibot"
 
export const Cat = v.pipe(
  v.object({
    name: v.string(),
    age: v.pipe(v.number(), v.integer()),
    loveFish: v.nullish(v.boolean()),
  }),
  asObjectType({
    name: "Cat",
    description: "A cute cat",
  })
)

In the above code, we have added a description metadata to the Cat object which will be presented in the GraphQL Schema:

GraphQL Schema

"""A cute cat"""
type Cat {
  name: String!
  age: Int!
  loveFish: Boolean
}

We can also use the asField function to add metadata to a field, such as description, type, and so on.

import * as v from "valibot"
import { asObjectType, asField } from "@gqloom/valibot"
import { GraphQLInt } from "graphql"
 
export const Cat = v.pipe(
  v.object({
    name: v.string(),
    age: v.pipe(
      v.number(),
      asField({ type: GraphQLInt, description: "How old is the cat" })
    ),
    loveFish: v.nullish(v.boolean()),
  }),
  asObjectType({
    name: "Cat",
    description: "A cute cat",
  })
)

In the above code, we added type and description metadata to the age field and ended up with the following GraphQL Schema:

GraphQL Schema

"""A cute cat"""
type Cat {
  name: String!
 
  """How old is the cat"""
  age: Int
  loveFish: Boolean
}

Declaring Interfaces

We can use the asObjectType function to define interfaces, for example:

import * as v from "valibot"
import { asObjectType } from "@gqloom/valibot"
 
const Fruit = v.object({
  __typename: v.nullish(v.literal("Fruit")),
  name: v.string(),
  color: v.string(),
  prize: v.number(),
})
 
const Orange = v.pipe(
  v.object({
    __typename: v.nullish(v.literal("Orange")),
    name: v.string(),
    color: v.string(),
    prize: v.number(),
  }),
  asObjectType({ interfaces: [Fruit] })
)

In the above code, we have created an interface Fruit using the asObjectType function and declared the Orange object as an implementation of the Fruit interface using the interfaces option.

Omitting Fields

We can also omit fields by setting type to null using the asField function, for example:

import * as v from "valibot"
import { asField } from "@gqloom/valibot"
 
const Dog = v.object({
  __typename: v.nullish(v.literal("Dog")),
  name: v.nullish(v.string()),
  birthday: v.pipe(v.nullish(v.date()), asField({ type: null })),
})

The following GraphQL Schema will be obtained:

GraphQL Schema

type Dog {
  name: String
}

Defining Union Types

When using Valibot, we can define union types using variant or union.

Using variant

We recommend using variant to define union types:

import * as v from "valibot"
import { asUnionType } from "@gqloom/valibot"
 
const Cat = v.object({
  __typename: v.literal("Cat"),
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveFish: v.nullish(v.boolean()),
})
 
const Dog = v.object({
  __typename: v.literal("Dog"),
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveBone: v.nullish(v.boolean()),
})
 
const Animal = v.pipe(
  v.variant("__typename", [Cat, Dog]),
  asUnionType({ name: "Animal" })
)

In the above code, we have created a union type using the variant function. In the case of Animal, it distinguishes the specific type by the __typename field.

Using union

We can also use union to define union types:

import { collectNames } from "@gqloom/core"
import { asUnionType } from "@gqloom/valibot"
import * as v from "valibot"
 
const Cat = v.object({
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveFish: v.nullish(v.boolean()),
})
 
const Dog = v.object({
  name: v.string(),
  age: v.pipe(v.number(), v.integer()),
  loveBone: v.nullish(v.boolean()),
})
 
const Animal = v.pipe(
  v.union([Cat, Dog]),
  asUnionType({
    resolveType: (it) => (it.loveFish ? "Cat" : "Dog"),
  })
)
 
collectNames({ Cat, Dog, Animal })

In the above code, we have created a union type using the union function. In the case of Animal, it uses the resolveType function to differentiate between specific types. Here, if an animal likes fish, then it is a cat, otherwise it is a dog.

Defining Enumeration Types

We can define enumeration types using v.picklist or v.enum_.

Using picklist

In general, we prefer to use v.picklist to define enumerated types:

import * as v from "valibot"
import { asEnumType } from "@gqloom/valibot"
 
export const Fruit = v.pipe(
  v.picklist(["apple", "banana", "orange"]),
  asEnumType({
    name: "Fruit",
    valuesConfig: {
      apple: { description: "red" },
      banana: { description: "yellow" },
      orange: { description: "orange" },
    },
  })
)
 
export type IFruit = v.InferOutput<typeof Fruit>

Using enum_

We can also use v.enum_ to define enumeration types:

import { asEnumType } from "@gqloom/valibot"
import * as v from "valibot"
 
export enum Fruit {
  apple = "apple",
  banana = "banana",
  orange = "orange",
}
 
export const FruitE = v.pipe(
  v.enum_(Fruit),
  asEnumType({
    name: "Fruit",
    valuesConfig: {
      apple: { description: "red" },
      [Fruit.banana]: { description: "yellow" },
      [Fruit.orange]: { description: "orange" },
    },
  })
)

Custom Type Mappings

To accommodate more Valibot types, we can extend GQLoom to add more type mappings.

First we use ValibotWeaver.config to define the type mapping configuration. Here we import the GraphQLDateTime, GraphQLJSON and GraphQLJSONObject scalars from [graphql-scalars] and map them to the matching GraphQL scalars when encountering the date, any and record types.

import {
  GraphQLDateTime,
  GraphQLJSON,
  GraphQLJSONObject,
} from "graphql-scalars"
import { ValibotWeaver } from "@gqloom/valibot"
 
export const valibotWeaverConfig = ValibotWeaver.config({
  presetGraphQLType: (schema) => {
    switch (schema.type) {
      case "date":
        return GraphQLDateTime
      case "any":
        return GraphQLJSON
      case "record":
        return GraphQLJSONObject
    }
  },
})

Configurations are passed into the weave function when weaving the GraphQL Schema:

import { weave } from "@gqloom/core"
 
export const schema = weave(valibotWeaverConfig, helloResolver)

Default Type Mappings

The following table lists the default mappings between Valibot types and GraphQL types in GQLoom:

Valibot types	GraphQL types
`v.array()`	`GraphQLList`
`v.bigint()`	`GraphQLInt`
`v.date()`	`GraphQLString`
`v.enum_()`	`GraphQLEnumType`
`v.picklist()`	`GraphQLEnumType`
`v.literal(false)`	`GraphQLBoolean`
`v.literal(0)`	`GraphQLFloat`
`v.literal("")`	`GraphQLString`
`v.looseObject()`	`GraphQLObjectType`
`v.object()`	`GraphQLObjectType`
`v.objectWithRest()`	`GraphQLObjectType`
`v.strict_object()`	`GraphQLObjectType`
`v.nonNullable()`	`GraphQLNonNull`
`v.nonNullish()`	`GraphQLNonNull`
`v.nonOptional()`	`GraphQLNonNull`
`v.number()`	`GraphQLFloat`
`v.pipe(v.number(), v.integer())`	`GraphQLInt`
`v.string()`	`GraphQLString`
`v.pipe(v.string(), v.cuid2())`	`GraphQLID`
`v.pipe(v.string(), v.ulid())`	`GraphQLID`
`v.pipe(v.string(), v.uuid())`	`GraphQLID`
`v.union()`	`GraphQLUnionType`
`v.variant()`	`GraphQLUnionType`

Valibot

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