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Create GraphQL schema with TypeScript classes.

typegql 최신버젼 다운로드

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### What is `typegql`?

![demo](https://raw.githubusercontent.com/prismake/typegql/master/assets/demo.gif)

typegql is set of decorators allowing creating GraphQL APIs quickly and in type-safe way.

* [Documentation](https://prismake.github.io/typegql/)

### Examples:

* [Basic Express example](examples/basic-express-server)
* [Typeorm integration example](examples/typeorm-basic-integration)
* [Forward resolution - eg. query only needed db fields](examples/forward-resolution)
* [Nested mutations or queries](examples/nested-mutation-or-query)
* [Custom decorators / Higher order decorators](examples/custom-decorators)
* [Serverless eg. AWS Lambda](examples/serverless)
* [Merge schemas](examples/merge-schemas)

## Basic example

Example below is able to resolve such query

```graphql
query {
  hello(name: "Bob") # will resolve to 'Hello, Bob!'
}
```

```typescript
import { compileSchema, SchemaRoot, Query } from 'typegql';

@SchemaRoot()
class SuperSchema {
  @Query()
  hello(name: string): string {
    return `Hello, ${name}!`;
  }
}

const compiledSchema = compileSchema({ roots: [SuperSchema] });
```

`compiledSchema` is regular executable schema compatible with `graphql-js` library.

To use it with `express`, you'd have to simply:

```typescript
import * as express from 'express';
import * as graphqlHTTP from 'express-graphql';

const app = express();

app.use(
  '/graphql',
  graphqlHTTP({
    schema: compiledSchema,
    graphiql: true,
  }),
);
app.listen(3000, () => console.log('Graphql API ready on http://localhost:3000/graphql'));
```

## Adding nested types

For now, our query field returned scalar (string). Let's return something more complex. Schema will look like:

```graphql
mutation {
  createProduct(name: "Chair", price: 99.99) {
    name
    price
    isExpensive
  }
}
```

Such query will have a bit more code and here it is:

```typescript
import { Schema, Query, ObjectType, Field, Mutation, compileSchema } from 'typegql';

@ObjectType({ description: 'Simple product object type' })
class Product {
  @Field() name: string;

@Field() price: number;

@Field()
  isExpensive() {
    return this.price > 50;
  }
}

@Schema()
class SuperSchema {
  @Mutation()
  createProduct(name: string, price: number): Product {
    const product = new Product();
    product.name = name;
    product.price = price;
    return product;
  }
}

const compiledSchema = compileSchema(SuperSchema);
```

## Forcing field type.

Until now, `typegql` was able to guess type of every field from typescript type definitions.

There are, however, some cases where we'd have to define them explicitly.

* We want to strictly tell if field is nullable or not
* We want to be explicit about if some `number` type is `Float` or `Int` (`GraphQLFloat` or `GraphQLInt`) etc
* Function we use returns type of `Promise<SomeType>` while field itself is typed as `SomeType`
* List (Array) type is used. (For now, typescript `Reflect` api is not able to guess type of single array item. This might change in the future)

Let's modify our `Product` so it has additional `categories` field that will return array of strings. For sake of readibility, I'll ommit all fields we've defined previously.

```typescript
@ObjectType()
class Product {
  @Field({ type: [String] }) // note we can use any native type like GraphQLString!
  categories(): string[] {
    return ['Tables', 'Furniture'];
  }
}
```

We've added `{ type: [String] }` as `@Field` options. Type can be anything that is resolvable to `GraphQL` type

* Native JS scalars: `String`, `Number`, `Boolean`.
* Any type that is already compiled to `graphql` eg. `GraphQLFloat` or any type from external graphql library etc
* Every class decorated with `@ObjectType`
* One element array of any of above for list types eg. `[String]` or `[GraphQLFloat]`

## Writing Asynchronously

Every field function we write can be `async` and return `Promise`. Let's say, instead of hard-coding our categories, we want to fetch it from some external API:

```typescript
@ObjectType()
class Product {
  @Field({ type: [String] }) // note we can use any native type like GraphQLString!
  async categories(): Promise<string[]> {
    const categories = await api.fetchCategories();
    return categories.map(cat => cat.name);
  }
}
```

## Before `1.0.0`

Before version `1.0.0` consider APIs of `typegql` to be subject to change. We encourage you to try this library out and provide us feedback so we can polish it to be as usable and efficent as possible.

typegql

typegql 최신버젼 다운로드

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