Ponder GraphQL Docstring Enrichment Middleware

0.1.3 verified Thu Apr 23 auth: no javascript

This package, `ponder-enrich-gql-docs-middleware`, provides a middleware for Ponder-based GraphQL APIs, enabling developers to augment their GraphQL documentation with detailed docstrings for types, fields, and queries. Currently at version `0.1.3`, it is in active development with a consistent release of minor versions, indicating potential breaking changes between `0.x.x` releases as it approaches a stable 1.0. Its core value lies in enhancing API discoverability and usability by enriching introspection query results with human-readable descriptions, without modifying the underlying GraphQL schema or affecting runtime performance. Key differentiators include its seamless integration into the Ponder ecosystem, comprehensive TypeScript support, zero runtime overhead due to its introspection-only processing, and a suite of helper functions for automatically generating common documentation patterns like pagination and filtering, significantly reducing manual documentation effort.

Common errors

error TypeError: Cannot read properties of undefined (reading 'use') ↓

cause The `ponder` object from `ponder:registry` is not correctly imported or initialized, or the `ponder` instance is not available in the current scope when the middleware is applied.

fix

Ensure import { ponder } from "ponder:registry"; is present and ponder is correctly configured and available before calling ponder.use().

error Error: Cannot find module 'ponder:registry' ↓

cause This error typically means the Ponder project setup is incomplete, or the bundler/runtime cannot resolve Ponder's virtual modules. Ponder relies on a specific project structure and runtime environment.

fix

Verify your Ponder installation and configuration. Ensure your ponder.config.ts is valid and the ponder CLI has been run to generate necessary files. This often happens if Ponder is not running or misconfigured, or if your build system doesn't support Ponder's virtual modules.

error Error: GraphQL Schema validation error: Unknown type "MyCustomType" (or similar 'field not found' errors) ↓

cause The documentation middleware attempts to add documentation for a type or field name that does not exist in the actual Ponder GraphQL schema.

fix

Review your docs object passed to createDocumentationMiddleware and ensure all type and field names (e.g., "User", "User.email") precisely match the definitions within your schema.graphql and the schema Ponder generates at runtime.

Warnings

breaking As a 0.x.x package, `ponder-enrich-gql-docs-middleware` may introduce breaking changes in minor versions (e.g., 0.1.x to 0.2.x) without prior major version increments. Users should pin exact versions or review changelogs carefully during upgrades. ↓

fix Review release notes before updating minor versions; consider pinning exact versions (`~0.1.x` instead of `^0.1.x`) in production to prevent unexpected breaking changes.

gotcha Incorrect versions of `graphql` or `hono` (peer dependencies) can lead to runtime errors or unexpected behavior due to API mismatches. Ensure your project's installed versions satisfy the specified peer dependency ranges. ↓

fix Check your `package.json` for `graphql` and `hono` and ensure they match the peer dependency requirements of `ponder-enrich-gql-docs-middleware` and Ponder itself. Run `npm install` or `pnpm install` after modifying dependencies.

gotcha This middleware exclusively modifies the documentation returned by introspection queries; it does not alter your `schema.graphql` file or affect the runtime behavior of your GraphQL API. Applications relying on runtime schema modifications or code generation from a modified schema will not see these documentation changes. ↓

fix Understand that the documentation enhancements are only visible in GraphQL tools like GraphiQL or Playground that utilize introspection. If you require schema changes, you must modify your `schema.graphql` directly.

Install

npm install ponder-enrich-gql-docs-middleware

yarn add ponder-enrich-gql-docs-middleware

pnpm add ponder-enrich-gql-docs-middleware

Imports

createDocumentationMiddleware

wrong

const { createDocumentationMiddleware } = require('ponder-enrich-gql-docs-middleware');

correct

import { createDocumentationMiddleware } from 'ponder-enrich-gql-docs-middleware';

Primary export for initializing the middleware. Prefer ESM imports given the package's TypeScript nature.

extendWithBaseDefinitions

wrong

import extendWithBaseDefinitions from 'ponder-enrich-gql-docs-middleware/extendWithBaseDefinitions';

correct

import { extendWithBaseDefinitions } from 'ponder-enrich-gql-docs-middleware';

Helper function for applying common GraphQL definitions. This is a named export, not a default.

generatePageDocs

wrong

import * as docHelpers from 'ponder-enrich-gql-docs-middleware'; docHelpers.generatePageDocs();

correct

import { generatePageDocs } from 'ponder-enrich-gql-docs-middleware';

Helper function to generate documentation for pagination. Destructuring directly is cleaner.

generateFilterDocs
```
import { generateFilterDocs } from 'ponder-enrich-gql-docs-middleware';
```
Helper function for generating documentation for filter arguments.

Quickstart

Demonstrates how to initialize the documentation middleware with custom and generated docstrings and apply it to a Ponder GraphQL endpoint. It includes basic type definitions and dynamic pagination documentation.

import { 
  createDocumentationMiddleware, 
  extendWithBaseDefinitions, 
  generatePageDocs
} from "ponder-enrich-gql-docs-middleware";
import { ponder } from "ponder:registry";
import { graphql } from "ponder";

// Define your documentation object with base definitions and generated pagination docs
const docs = extendWithBaseDefinitions({
  // Define specific type and field descriptions
  User: "Represents a user in the system",
  "User.email": "The user's email address",
  "User.name": "The user's full name",

  // Dynamically generate documentation for pagination on the 'User' type
  ...generatePageDocs("User", "user"),
});

// Initialize the documentation middleware with the defined documentation
const docMiddleware = createDocumentationMiddleware(docs, { debug: false });

// Apply the documentation middleware and then the Ponder GraphQL handler to your /graphql endpoint
// The order is important: middleware first, then the actual GraphQL handler
ponder.use("/graphql", docMiddleware);
ponder.use("/graphql", graphql());

console.log('Ponder GraphQL endpoint enriched with documentation middleware.');