fix: include body schema in OpenAPI docs when parse is 'none'

When using `parse: 'none'` to preserve raw request bodies, the body
schema was being omitted from generated OpenAPI documentation because
the 'none' case was not handled in the content type switch statement.

This fix adds a case for 'none' that includes all common content types
(application/json, application/x-www-form-urlencoded, multipart/form-data,
text/plain) since the raw body could be any format.

Fixes #1720

Author: Kai Gritun

bun.lock

@@ -936,6 +936,17 @@ export function toOpenAPISchema(
 									schema: body
 								}
 								continue
+
+							case 'none':
+								// When parse is "none", include all common content types
+								// since the raw body could be any format
+								content['application/json'] = { schema: body }
+								content['application/x-www-form-urlencoded'] = {
+									schema: body
+								}
+								content['multipart/form-data'] = { schema: body }
+								content['text/plain'] = { schema: body }
+								continue
 						}
 					}
 

src/openapi.ts

@@ -1276,4 +1276,32 @@ describe('OpenAPI > toOpenAPISchema', () => {
 			}
 		})
 	})
+
+	it('include body schema when parse is "none"', () => {
+		const app = new Elysia().post(
+			'/echo',
+			({ request }) => request,
+			{
+				body: t.Object({ input: t.String() }),
+				parse: 'none'
+			}
+		)
+
+		const schema = JSON.parse(JSON.stringify(toOpenAPISchema(app)))
+
+		expect(schema.paths['/echo'].post.requestBody).toBeDefined()
+		expect(schema.paths['/echo'].post.requestBody.content).toBeDefined()
+		expect(
+			schema.paths['/echo'].post.requestBody.content['application/json']
+		).toBeDefined()
+		expect(
+			schema.paths['/echo'].post.requestBody.content['application/json'].schema
+		).toEqual({
+			type: 'object',
+			properties: {
+				input: { type: 'string' }
+			},
+			required: ['input']
+		})
+	})
 })