How to Get the Graphql Schema In Typescript?

13 minutes read

To get the GraphQL schema in TypeScript, you can use a tool like graphql-codegen which allows you to generate TypeScript types from your schema. This tool will analyze your schema and generate typescript types for all your queries, mutations, and subscriptions. This way, you can have type-safe code when working with GraphQL in your TypeScript projects. Additionally, you can also fetch the schema directly from your GraphQL server using introspection queries and then convert it to TypeScript types manually.

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What steps are involved in getting the GraphQL schema in TypeScript?

  1. Define the GraphQL schema using the GraphQL schema language. This involves defining the types, queries, mutations, and subscriptions that make up the API.
  2. Install the necessary dependencies in your project. This typically includes graphql for working with GraphQL, @types/graphql for TypeScript typings, and any other necessary libraries for your specific project setup.
  3. Create a TypeScript interface for each of the types defined in the GraphQL schema. This involves mapping each field in the type to its corresponding TypeScript type.
  4. Create a TypeScript type for each of the queries, mutations, and subscriptions defined in the schema. This involves defining the parameters and return types for each operation.
  5. Use an Apollo Client or other GraphQL client library to interact with the GraphQL API. This client library will typically include type definitions for the GraphQL schema, allowing you to use the TypeScript types you defined earlier.
  6. Test your GraphQL API by running queries, mutations, and subscriptions using the TypeScript types you defined. This will help ensure that your TypeScript types are correctly mapping to the GraphQL schema.
  7. Update and iterate on your TypeScript types as needed based on feedback from testing and development. This may involve refining the types, adding new types, or making other adjustments to best reflect the GraphQL schema.


How to access the GraphQL schema in TypeScript?

You can access the GraphQL schema in TypeScript by generating a TypeScript typings file from your GraphQL schema using tools like graphql-typings or graphql-code-generator. Here's a simple example of how you can do this using graphql-code-generator:

  1. Install graphql-code-generator and necessary plugins:
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npm install @graphql-codegen/cli @graphql-codegen/typescript @graphql-codegen/typescript-operations @graphql-codegen/typescript-resolvers


  1. Create a codegen.yml file with the following configuration:
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overwrite: true
schema: path/to/your/schema.graphql
documents: path/to/your/*.graphql
generates:
  path/to/your/types.d.ts:
    plugins:
      - typescript
      - typescript-operations
      - typescript-resolvers


  1. Run graphql-codegen with the configuration file:
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npx graphql-codegen --config codegen.yml


  1. This will generate a types.d.ts file that contains TypeScript typings for your GraphQL schema, queries, mutations, and resolvers. You can now import and use these typings in your TypeScript code to access the GraphQL schema.
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import { MyQuery } from './types';

const query: MyQuery = {
  // Query variables and fields
};


Now you can use the generated TypeScript typings to safely access and interact with your GraphQL schema in a type-safe manner.


How to use TypeScript to generate a GraphQL schema?

To use TypeScript to generate a GraphQL schema, you can follow these steps:

  1. Install the necessary dependencies: First, you will need to install the necessary TypeScript and GraphQL libraries. You can use npm to install them with the following command:
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npm install typescript graphql


  1. Define your GraphQL schema: Next, you can define your GraphQL schema using SDL (Schema Definition Language) in a .graphql or .gql file. For example, you can create a file named schema.graphql with the following content:
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type Query {
  hello: String
}


  1. Create a TypeScript file to generate the schema: Create a TypeScript file, for example generateSchema.ts, and write the code to generate the GraphQL schema using the schema definition from step 2. Here is an example code snippet to generate the schema:
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import { buildSchema } from 'graphql';
import { readFileSync } from 'fs';

const schemaDef = readFileSync('schema.graphql', 'utf8');
const schema = buildSchema(schemaDef);

console.log(schema);


  1. Run the TypeScript file to generate the schema: Run the TypeScript file using the TypeScript compiler (tsc) to generate the GraphQL schema. You can use the following command to compile and run the TypeScript file:
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tsc generateSchema.ts && node generateSchema.js


  1. Verify the generated GraphQL schema: After running the TypeScript file, the generated GraphQL schema will be output to the console. You can verify the generated schema to ensure it matches the schema definition you provided.


By following these steps, you can use TypeScript to generate a GraphQL schema from a schema definition file. This can be useful for automatically generating schemas for your GraphQL API based on predefined schema definitions.


How to generate TypeScript types from the GraphQL schema?

There are several tools available that can generate TypeScript types from a GraphQL schema. One popular tool is graphql-codegen. Here is an example of how you can use graphql-codegen to generate TypeScript types from a GraphQL schema:

  1. Install graphql-codegen using npm or yarn:
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npm install -g graphql-codegen


  1. Create a codegen.yml configuration file in the root of your project with the following content:
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schema: path/to/your/graphql/schema.graphql
documents: 'src/**/*.graphql'
generates:
  path/to/output/types.ts:
    plugins:
      - 'typescript'


  1. Run graphql-codegen in your project directory:
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npx graphql-codegen


This will generate TypeScript types in the specified output file based on your GraphQL schema. You can now import these generated types in your TypeScript code and use them to ensure type safety when working with GraphQL queries and mutations.

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