@ferstack/gql-typescript
v0.6.1
Published
An agnostic GraphQL query builder bundled with a generator
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@ferstack/gql-typescript
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Author: Fernando Coelho
License: MIT
Description
An agnostic GraphQL query builder bundled with a generator. This package provides a flexible way to build GraphQL queries in TypeScript, leveraging type safety and automatic generation of query documents.
Installation
To install the package, use the following command:
npm install @ferstack/gql-typescript
Usage
Editor Remote Control
When dealing with type generators, VSCode can be unresponsive, as it does not update the types when they are generated under a file you are not currently accessing.
For instance, Prisma type generation works by restarting the TypeScript server each time you run prisma db push
.
Although I may develop a library-specific extension in the future, for now, I'm using the VScode remote control extension to reload the TS Server.
It works by opening a WebSocket server where you pass commands to be executed in VSCode.
That means: IF YOU ARE USING VSCODE, YOU MUST INSTALL THIS EXTENSION
GraphQL Schema
You will need a GraphQL schema, which can be located at a path or an HTTP URL:
# apps/backend/schema.graphql
scalar DateTime
type PhysicalEvaluation {
height: Float!
weight: Float!
}
type Mutation {
createPhysicalEvaluation: PhysicalEvaluation!
}
CLI Configuration
Now, configure the CLI to run with the frontend server to generate the types:
// apps/frontend/config.mjs
import { CLIConfig } from "@ferstack/gql-typescript/cli";
const config = new CLIConfig({
schema: "apps/backend/schema.graphql",
watch: true,
});
export default config;
Execute the Generator with the Frontend Server
// apps/frontend/package.json
{
"name": "web",
"scripts": {
"dev": "gql-typescript --config ./config.mjs && next dev"
}
}
The Actual Client
gql-typescript
offers just a query-builder, so you'll need a client to execute the query.
Here's an implementation with SWR
and graphql-request
for NextJS
:
// apps/frontend/lib/swr-gql.ts
import { GQLRequest } from "@ferstack/gql-typescript";
import { DocumentNode } from "graphql";
import { request } from "graphql-request";
import useSWR from "swr";
import useSWRMutation from "swr/mutation";
function fetcher(query: DocumentNode, variables: Record<string, any> = {}) {
return request("http://localhost:5000/graphql", query, variables);
}
export function useQuery<TRequest extends GQLRequest<any, any>>(
request: TRequest
) {
const { mutate, ...rest } = useSWR<TRequest["_returnType"], any, any>(
request.documentNode,
(document: DocumentNode, { arg }: { arg: TRequest["_variablesType"] }) =>
fetcher(document, request.variables(arg)) as any
);
return rest;
}
export function useMutation<TRequest extends GQLRequest<any, any>>(
request: TRequest
) {
return useSWRMutation<
TRequest["_returnType"],
any,
DocumentNode,
TRequest["_variablesType"]
>(
request.documentNode,
(document, { arg }) => fetcher(document, request.variables(arg)) as any,
{
populateCache: false,
}
);
}
Enjoy Full Query Type Safety
// apps/frontend/page.tsx
import { useState } from "react";
import { gql } from "@ferstack/gql-typescript";
import { useQuery } from 'lib/swr-gql'
export function AddPhysicalEval() {
const [isOpen, setIsOpen] = useState(false);
const toggleOpen = () => setIsOpen(!isOpen);
const mutation = gql("mutation", {
createPhysicalEvaluation: {
data: {
height: true,
weight: true,
},
errors: {
message: true,
path: true,
},
},
});
const { data, trigger } = useMutation(mutation);
const entry = data[
// full autocomplete on response
]
trigger({
// this will also show all args you declared
})
return <Fragment />;
}
Warnings
- Keep in mind I'm currently using polling for fetching the URL schema every 1.5 seconds, so it might not be ideal. I'm looking forward to implementing WebSockets and GraphQL subscriptions.