Better support for json-like input and outputs in the schema

generator/gen.ts

@@ -124,6 +124,8 @@ export default async (params: { files: string[] }) => {
   };
 
   const PLACEHOLDER_ID = '@__PLACEHOLDER_ID__@' + Date.now();
+  const defaultAgs = TJS.getDefaultArgs();
+
   const settings: TJS.PartialArgs = {
     required: true,
     ref: true,
@@ -134,6 +136,8 @@ export default async (params: { files: string[] }) => {
     ignoreErrors: true,
     strictNullChecks: true,
     id: PLACEHOLDER_ID,
+    // add support for ajv-keywords
+    validationKeywords: [...defaultAgs.validationKeywords, 'instanceof', 'typeof'],
   };
 
   let { files } = params;

package.json

@@ -12,6 +12,7 @@
     "glob": "^10.3.4",
     "json-schema-merge-allof": "^0.8.1",
     "json-schema-traverse": "^1.0.0",
+    "type-fest": "^4.6.0",
     "typescript-json-schema": "^0.61.0",
     "yargs": "^17.7.2"
   },
@@ -26,6 +27,8 @@
     "@types/split2": "^4.2.0",
     "@types/tap": "^15.0.9",
     "@types/yargs": "^17.0.24",
+    "ajv-formats": "2.1.1",
+    "ajv-keywords": "5.1.0",
     "coveralls": "3.1.1",
     "fastify": "^4.23.2",
     "husky": "^8.0.3",
@@ -38,7 +41,6 @@
     "tap": "^16.3.8",
     "ts-node-dev": "^2.0.0",
     "tsd": "^0.29.0",
-    "type-fest": "^4.3.1",
     "typescript": "^5.2.2"
   },
   "directories": {

src/schema.ts

@@ -6,20 +6,25 @@ import type { Stream } from 'stream';
 export type StatusCode =
     | 100 | '100' // Continue
     | 101 | '101' // Switching Protocols
+    | 103 | '103' // Early Hints
     | 200 | '200' // OK
     | 201 | '201' // Created
     | 202 | '202' // Accepted
     | 203 | '203' // Non-Authoritative Information
     | 204 | '204' // No Content
     | 205 | '205' // Reset Content
     | 206 | '206' // Partial Content
+    | 207 | '207' // Multi-Status
+    | 208 | '208' // Already Reported
+    | 226 | '226' // IM Used
     | 300 | '300' // Multiple Choices
     | 301 | '301' // Moved Permanently
     | 302 | '302' // Found
     | 303 | '303' // See Other
     | 304 | '304' // Not Modified
     | 305 | '305' // Use Proxy
     | 307 | '307' // Temporary Redirect
+    | 308 | '308' // Permanent Redirect
     | 400 | '400' // Bad Request
     | 401 | '401' // Unauthorized
     | 402 | '402' // Payment Required
@@ -39,12 +44,22 @@ export type StatusCode =
     | 416 | '416' // Range Not Satisfiable
     | 417 | '417' // Expectation Failed
     | 426 | '426' // Upgrade Required
+    | 427 | '427' // Unassigned
+    | 428 | '428' // Precondition Required
+    | 429 | '429' // Too Many Requests
+    | 431 | '431' // Request Header Fields Too Large
+    | 451 | '451' // Unavailable For Legal Reasons
     | 500 | '500' // Internal Server Error
     | 501 | '501' // Not Implemented
     | 502 | '502' // Bad Gateway
     | 503 | '503' // Service Unavailable
     | 504 | '504' // Gateway Timeout
-    | 505 | '505'; // HTTP Version Not Supported;
+    | 505 | '505' // HTTP Version Not Supported;
+    | 506 | '506' // Variant Also Negotiates
+    | 507 | '507' // Insufficient Storage
+    | 508 | '508' // Loop Detected
+    | 510 | '510' // Not Extended
+    | 511 | '511' // Network Authentication Required
 
 export interface FastifyError extends Error {
   code: string;
@@ -71,7 +86,8 @@ export interface Operation {
     };
   };
 }
+
 export interface Schema<SecurityId extends string = string> {
   readonly __SCHEMA_TAG__?: 'BETTER-FASTIFY-SCHEMA';
-  paths: Record<`${HTTPMethods} ${string}`, Partial<Operation>>;
+  paths: Record<`${HTTPMethods} ${string}`, Operation>;
 }

src/type-utils.ts

@@ -0,0 +1,75 @@
+import type {
+  PositiveInfinity,
+  NegativeInfinity,
+  JsonPrimitive,
+  JsonValue,
+  EmptyObject,
+  TypedArray,
+  WritableDeep,
+  IsNever,
+  IsUnknown,
+} from 'type-fest';
+export type Id<T> = T extends infer U ? { [K in keyof U]: U[K] } : never;
+export type Get<T, P> = P extends keyof T ? T[P] : never;
+export type Get2<T, P, P2> = Get<Get<T, P>, P2>;
+export type IsEqual<T, U> = (<G>() => G extends T ? 1 : 2) extends <G>() => G extends U ? 1 : 2 ? true : false;
+
+type IsNotJsonableError<T> = Invalid<`${Extract<T, string>} is not Json-like`> & {};
+
+type NotJsonable = ((...arguments_: any[]) => any) | undefined | symbol | RegExp | Function;
+
+type NeverToNull<T> = IsNever<T> extends true ? null : T;
+
+type JsonCastBehavior = 'cast' | 'no-cast';
+
+// Handles tuples and arrays
+type JsonlikeList<T extends unknown[], DoNotCastToPrimitive extends JsonCastBehavior> = T extends []
+  ? []
+  : T extends [infer F, ...infer R]
+  ? [NeverToNull<Jsonlike<F, DoNotCastToPrimitive>>, ...JsonlikeList<R, DoNotCastToPrimitive>]
+  : IsUnknown<T[number]> extends true
+  ? []
+  : Array<T[number] extends NotJsonable ? null : Jsonlike<T[number], DoNotCastToPrimitive>>;
+
+// tweaked version of Jsonify from type-fest
+export type Jsonlike<T, CastBehavior extends JsonCastBehavior> = T extends PositiveInfinity | NegativeInfinity
+  ? null
+  : T extends NotJsonable
+  ? IsNotJsonableError<'Passed value'>
+  : T extends JsonPrimitive
+  ? T
+  : // Any object with toJSON is special case
+  T extends {
+      toJSON(): infer J;
+    }
+  ? (() => J) extends () => JsonValue // Is J assignable to JsonValue?
+    ? CastBehavior extends 'no-cast'
+      ? T
+      : J // Then T is Jsonable and its Jsonable value is J
+    : Jsonlike<J, CastBehavior> // Maybe if we look a level deeper we'll find a JsonValue
+  : // Instanced primitives are objects
+  T extends Number
+  ? number
+  : T extends String
+  ? string
+  : T extends Boolean
+  ? boolean
+  : T extends Map<any, any> | Set<any>
+  ? EmptyObject
+  : T extends TypedArray
+  ? Record<string, number> // Non-JSONable type union was found not empty
+  : T extends []
+  ? []
+  : T extends unknown[]
+  ? JsonlikeList<T, CastBehavior>
+  : T extends readonly unknown[]
+  ? JsonlikeList<WritableDeep<T>, CastBehavior>
+  : T extends object
+  ? {
+      [K in keyof T]: [T[K]] extends [NotJsonable] | [never] ? IsNotJsonableError<K> : Jsonlike<T[K], CastBehavior>;
+    } // JsonifyObject recursive call for its children
+  : IsNotJsonableError<'Passed value'>;
+
+export interface Invalid<msg = any> {
+  readonly __INVALID__: unique symbol;
+}

src/typed-fastify.ts

@@ -9,6 +9,7 @@ import {
   ResolveFastifyRequestType,
 } from 'fastify/types/type-provider';
 import { Operation, Schema } from './schema';
+import { Jsonlike, Id, Get2, Get, IsEqual, Invalid } from './type-utils';
 
 const addSchema = <
   ServiceSchema extends Schema,
@@ -224,7 +225,7 @@ interface Reply<
         ]
       : [Get2<Op['response'], Status, 'content'>] extends [never]
       ? []
-      : [Get2<Op['response'], Status, 'content'>]
+      : [Jsonlike<Get2<Op['response'], Status, 'content'>, 'no-cast'>]
   ): AsReply;
 
   readonly request: Request<ServiceSchema, Op, Path, RawServer, RawRequest>;
@@ -282,10 +283,6 @@ type OpaqueReply<
   Opaque = Reply<Op, Status, Content, Headers, Path, ServiceSchema, RawServer, RawRequest, RawReply, ContextConfig>,
 > = Status extends unknown ? Opaque : Content extends unknown ? Opaque : Headers extends unknown ? Opaque : never;
 
-interface Invalid<msg = any> {
-  readonly __INVALID__: unique symbol;
-}
-
 interface AsReply {
   readonly __REPLY_SYMBOL__: unique symbol;
   then(fulfilled: () => void, rejected: (err: Error) => void): void;
@@ -295,8 +292,6 @@ export const asReply = (any: any) => {
   assertAsReply(any);
   return any;
 };
-type Get<T, P> = P extends keyof T ? T[P] : never;
-type Get2<T, P, P2> = Get<Get<T, P>, P2>;
 
 interface Router<Op extends Operation> {
   Querystring: Get<Op['request'], 'querystring'>;
@@ -306,7 +301,6 @@ interface Router<Op extends Operation> {
   // force reply to be never, as we expose it via custom reply interface
   Reply: never;
 }
-type Id<T> = T extends infer U ? { [K in keyof U]: U[K] } : never;
 
 interface Request<
   ServiceSchema extends Schema,
@@ -329,9 +323,11 @@ interface Request<
   ROptions extends Omit<RequestRouteOptions<ContextConfig, SchemaCompiler>, 'method' | 'url'> & {
     method: MP<Path>[0];
     url: MP<Path>[1];
+    body: Get<Op['request'], 'body'>;
   } = Omit<RequestRouteOptions<ContextConfig, SchemaCompiler>, 'method' | 'url'> & {
     method: MP<Path>[0];
     url: MP<Path>[1];
+    body: Get<Op['request'], 'body'>;
   },
 > extends Omit<
     F.FastifyRequest<
@@ -349,15 +345,13 @@ interface Request<
   readonly operationPath: Path;
   readonly method: ROptions['method'];
   // A payload within a GET request message has no defined semantics; sending a payload body on a GET request might cause some existing implementations to reject the request.
-  readonly body: ROptions['method'] extends 'GET' ? never : Get<Op['request'], 'body'>;
+  readonly body: ROptions['method'] extends 'GET' ? never : Jsonlike<ROptions['body'], 'cast'>;
   readonly routeOptions: Id<Readonly<ROptions>>;
   readonly routerMethod: ROptions['method'];
   readonly headers: Get<Op['request'], 'headers'>;
   readonly routerPath: ROptions['url'];
 }
 
-type IsEqual<T, U> = (<G>() => G extends T ? 1 : 2) extends <G>() => G extends U ? 1 : 2 ? true : false;
-
 type GetInvalidParamsValidation<
   Op extends Operation,
   Path extends keyof ServiceSchema['paths'],