feat: add fastify plugin

.changeset/gorgeous-cups-search.md

@@ -0,0 +1,5 @@
+---
+'@hey-api/openapi-ts': minor
+---
+
+feat: add fastify-openapi-glue plugin

packages/openapi-ts/src/plugins/fastify/config.ts

@@ -0,0 +1,18 @@
+import type { DefineConfig, PluginConfig } from '../types';
+import { handler } from './plugin';
+import type { Config } from './types';
+
+export const defaultConfig: PluginConfig<Config> = {
+  _handler: handler,
+  _handlerLegacy: () => {},
+  name: 'fastify',
+  output: 'fastify',
+};
+
+/**
+ * Type helper for the Fastify plugin, returns {@link PluginConfig} object
+ */
+export const defineConfig: DefineConfig<Config> = (config) => ({
+  ...defaultConfig,
+  ...config,
+});

packages/openapi-ts/src/plugins/fastify/index.ts

@@ -0,0 +1,2 @@
+export { defaultConfig, defineConfig } from './config';
+export type { Config } from './types';

packages/openapi-ts/src/plugins/fastify/plugin.ts

@@ -0,0 +1,178 @@
+import type ts from 'typescript';
+
+import { compiler, type Property } from '../../compiler';
+import type { IRContext } from '../../ir/context';
+import type {
+  IROperationObject,
+  IRParameterObject,
+  IRPathItemObject,
+  IRPathsObject,
+} from '../../ir/ir';
+import { irParametersToIrSchema } from '../../ir/schema';
+import type { PluginHandler } from '../types';
+import {
+  componentsToType,
+  schemaToType,
+  type SchemaToTypeOptions,
+} from '../utils/types';
+import type { Config } from './types';
+
+const FILE_ID = 'fastify';
+const ROUTE_HANDLER_NAME = 'RouteHandler';
+const OPERATIONS_IDENTIFIER = 'FastifyRouteHandlers';
+const ROUTE_PROPERTY_NAME = {
+  BODY: 'Body',
+  HEADER: 'Headers',
+  PATH: 'Params',
+  QUERY: 'Querystring',
+  RESPONSE: 'Reply',
+};
+
+const parameterToProperty = ({
+  options,
+  parameter,
+  name,
+}: {
+  name: string;
+  options: SchemaToTypeOptions;
+  parameter: Record<string, IRParameterObject>;
+}): Property => {
+  const schema = irParametersToIrSchema({
+    parameters: parameter,
+  });
+  return {
+    isRequired: !!schema.required,
+    name,
+    type: schemaToType({ options, schema }),
+  };
+};
+
+const operationToProperty = ({
+  operation,
+  options,
+}: {
+  operation: IROperationObject;
+  options: SchemaToTypeOptions;
+}): Property => {
+  const operationProperties: Array<Property> = [];
+
+  if (operation.body) {
+    operationProperties.push({
+      isRequired: operation.body.required,
+      name: ROUTE_PROPERTY_NAME.BODY,
+      type: schemaToType({
+        options,
+        schema: operation.body.schema,
+      }),
+    });
+  }
+
+  if (operation.parameters) {
+    if (operation.parameters.header) {
+      operationProperties.push(
+        parameterToProperty({
+          name: ROUTE_PROPERTY_NAME.HEADER,
+          options,
+          parameter: operation.parameters.header,
+        }),
+      );
+    }
+
+    if (operation.parameters.query) {
+      operationProperties.push(
+        parameterToProperty({
+          name: ROUTE_PROPERTY_NAME.QUERY,
+          options,
+          parameter: operation.parameters.query,
+        }),
+      );
+    }
+
+    if (operation.parameters.path) {
+      operationProperties.push(
+        parameterToProperty({
+          name: ROUTE_PROPERTY_NAME.PATH,
+          options,
+          parameter: operation.parameters.path,
+        }),
+      );
+    }
+  }
+
+  if (operation.responses) {
+    const responseProperties: Array<Property> = [];
+    for (const code in operation.responses) {
+      const response = operation.responses[code];
+      responseProperties.push({
+        name: code,
+        type: schemaToType({
+          options,
+          schema: response?.schema ?? {},
+        }),
+      });
+    }
+    operationProperties.push({
+      name: ROUTE_PROPERTY_NAME.RESPONSE,
+      type: compiler.typeInterfaceNode({
+        properties: responseProperties,
+        useLegacyResolution: false,
+      }),
+    });
+  }
+
+  const operationType = compiler.typeInterfaceNode({
+    properties: operationProperties,
+    useLegacyResolution: false,
+  });
+  const property: Property = {
+    name: operation.id,
+    type: compiler.typeNode(ROUTE_HANDLER_NAME, [operationType]),
+  };
+  return property;
+};
+
+const pathsToType = ({
+  context,
+  options,
+}: {
+  context: IRContext;
+  options: SchemaToTypeOptions;
+}): ts.Node => {
+  const operationsProperties = [];
+  for (const path in context.ir.paths) {
+    const pathItem = context.ir.paths[path as keyof IRPathsObject];
+    for (const method in pathItem) {
+      const operation = pathItem[method as keyof IRPathItemObject];
+      if (operation) {
+        const operationProperty = operationToProperty({ operation, options });
+        operationsProperties.push(operationProperty);
+      }
+    }
+  }
+
+  const identifier = context.file({ id: FILE_ID })!.identifier({
+    $ref: OPERATIONS_IDENTIFIER,
+    create: true,
+    namespace: 'type',
+  });
+  const paths = compiler.typeAliasDeclaration({
+    exportType: true,
+    name: identifier.name || '',
+    type: compiler.typeInterfaceNode({
+      properties: operationsProperties,
+      useLegacyResolution: false,
+    }),
+  });
+  return paths;
+};
+
+export const handler: PluginHandler<Config> = ({ context, plugin }) => {
+  const file = context.createFile({ id: FILE_ID, path: plugin.output });
+  const options: SchemaToTypeOptions = { file };
+  file.import({ asType: true, module: 'fastify', name: ROUTE_HANDLER_NAME });
+  componentsToType({
+    context,
+    options,
+  });
+  file.add(pathsToType({ context, options }));
+};

packages/openapi-ts/src/plugins/fastify/types.d.ts

@@ -0,0 +1,11 @@
+import type { PluginName } from '../types';
+
+export interface Config extends PluginName<'fastify'> {
+  /**
+   * Name of the generated file.
+   * @default 'fastify'
+   */
+  output?: string;
+}
+
+export interface UserConfig extends Omit<Config, 'output'> {}

packages/openapi-ts/src/plugins/index.ts

@@ -30,6 +30,7 @@ import {
   type Config as TanStackVueQuery,
   defaultConfig as tanStackVueQuery,
 } from './@tanstack/vue-query';
+import { type Config as Fastify, defaultConfig as fastify } from './fastify';
 import type {
   DefaultPluginConfigsMap,
   PluginConfig,
@@ -48,7 +49,8 @@ export type UserPlugins =
   | UserConfig<TanStackReactQuery>
   | UserConfig<TanStackSolidQuery>
   | UserConfig<TanStackSvelteQuery>
-  | UserConfig<TanStackVueQuery>;
+  | UserConfig<TanStackVueQuery>
+  | UserConfig<Fastify>;
 // | UserConfig<Zod>
 
 export type ClientPlugins =
@@ -60,6 +62,7 @@ export type ClientPlugins =
   | PluginConfig<TanStackSolidQuery>
   | PluginConfig<TanStackSvelteQuery>
   | PluginConfig<TanStackVueQuery>
+  | PluginConfig<Fastify>
   | PluginConfig<Zod>;
 
 export const defaultPluginConfigs: DefaultPluginConfigsMap<ClientPlugins> = {
@@ -71,5 +74,6 @@ export const defaultPluginConfigs: DefaultPluginConfigsMap<ClientPlugins> = {
   '@tanstack/solid-query': tanStackSolidQuery,
   '@tanstack/svelte-query': tanStackSvelteQuery,
   '@tanstack/vue-query': tanStackVueQuery,
+  fastify,
   zod,
 };

packages/openapi-ts/src/plugins/types.d.ts

@@ -32,6 +32,7 @@ export type PluginNames =
   | '@tanstack/solid-query'
   | '@tanstack/svelte-query'
   | '@tanstack/vue-query'
+  | 'fastify'
   | 'zod';
 
 export interface PluginName<Name extends PluginNames> {