@gql-unicorn/codegen

GraphQL Unicorn

Generates types from GraphQL schema and a very minimal tree shakeable runtime information from schema for builder.

Name of this package is a combination of GraphQl + unicorn (beacuse this is a 🦄 )

[!IMPORTANT] Currently in development, this info is potentially wrong or incomplete.

Install

npm install @gql-unicorn/cli --save-dev
npm install @gql-unicorn/runtime --save

Usage

[!IMPORTANT] Don't rebind any function, this lib uses Proxy and if you rebind a function it will break.

Query

import { queryArticles, Blog, News $ } from "genrated-pacakge-name"

const fragment = News.$fragment("fragmentName", q => q.author(q => q.id.name))

const articlesQuery = queryArticles({filter: { title "..." }}, q => q.id
    .name
    .tags({count: $("count")}, q => q.id.name)
    .another_field
    .$on(fragment)
    .$on(Blog(q => q.some_field.author(q => q.id.name)))
)

async function doSomething() {
    const result = await someLibThatExecGql(articlesQuery)
    for (const article of result) {
        doSomethingWithArticle(article)
    }
}

function doSomethingWithArticle(article: TypeOf<typeof articlesQuery>[number]) {}

function doSomethingWithFragment(fragment: TypeOf<typeof fragment>) {}

Builder

import { queryUsers } from "genrated-pacakge-name"

const GetUserBuilder = queryUsers.builder().id

const GetUsersWithName = GetUserBuilder.name.$build()
const PFragment = Pagination.fragment(q => q.offset.limit)
const GetUsersWithPganination = GetUserBuilder.$on(PFragment).$build()

Selected type

import { queryUsers, $, type TypeOf, type Selected } from "genrated-pacakge-name"

const GetUser = queryUsers({id: $("userId")}, q => q.id
    .name
    .articles(q => q.id.name)
)

type SUser = Selected<User, ["id", "name", { articles: ["id", "name"] }]>
type SUserInfer = TypeOf<typeof GetUser> // === SUser

// TODO: currently not working
type SUserWithAlias = Selected<User, [{ id: "userId" }, "name", { articles: ["id", "name"] }]>

Mutation

import { createUser } from "genrated-pacakge-name"

const CreateUser = createUser({ name: "Some User Name" }, q => q.id.name)

Type Check

import { Worker } from "genrated-pacakge-name"

if (Worker.is(user)) {
    // only usable fields is selected worker fields
}

Special Types

import { queryUsers, type TypeOf,  type VarOf, $ } from "genrated-pacakge-name"

const GetUser = queryUsers({id: $("userId")}, q => q.id.name)
type User = TypeOf<typeof GetUser> // Selected<User, ["id", "name"]>
type UserVars = VarOf<typeof GetUser> // { userId: string }

Variables

import { $, $$, queryUsers, UserFilter } from "genrated-pacakge-name"

const q = queryUsers(
    { filter: $("filterVar"), offset: $("offsetVar"), count: $("countVar") }
    q => q.id.name
)
type _User = TypeOf<typeof q> // Selected<User, ["id", "name"]>
type _UserVars = VarOf<typeof q> // {filterVar: string, offsetVar: number, countVar: number}

// or simplified version, $$ extends to something similar:
// { filter: $("filter"), offset: $("offset"), count: $("count") }
const q = queryUsers($$, q => q.id.name)

// or with shorthands
const q = queryUsers(
    { filter: $("filterVar"), offset: $$, count: $$ },
    q => q.id.name
)
type _UserVars = VarOf<typeof q> // {filterVar: string, offset: number, count: number}

const q = queryUsers(
    $$,
    q => q.id.articles({ count: $$ }, q => q.id.title)
)
// { filter: $("filter"), offset: $("offset"), count: $("count"), articles__count: $("articles__count") }
type _UserVars = VarOf<typeof q>

Compatibility

• Compatible with every packages that ghandle TypedDocumentNode

  To create TypedDocumentNode use $build function

• Compatible with every packages that handle GraphQL queries in string format

  To create GraphQL string use $gql function

TODO

• find a way to replace $$ with $, or something more intuitive than $$
• find a way to use $.varName instead $("varName")
• handle aliases: queryUsers(q => q.id("userId").attr("name", { name: "name" }, q => q.value).attr("age", { name: "age" }, q => q.value))

Changelog

0.4.7 (2025-08-22)

• in transform config now can handle import types from other packages for scalar configs (7fe4a6c)