Move RpcRequest and RpcResponse types to rpc-spec-types (#3393)

One of the goals of this stack is to eventually make `RpcRequestTransformers` and `RpcResponseTransformers` usable on both RPC and RPC Subscriptions architectures. This was the original intention of the `rpc-transformers` package which already hosts request and response transformers for both but with inconsistent types.

As such, this PR aims to get closer to this goal by moving the `RpcRequest`, `RpcResponse`, `RpcRequestTransformer` and `RpcResponseTransformer` types from the `rpc-spec` package to the `rpc-spec-types` package.

As a reminder the `rpc-spec` and `rpc-subscriptions-spec` packages define the interfaces of the RPC and RPC Subscriptions architectures respectively, whereas, the `rpc-spec-types` package is a utility package that is imported by both of the former packages.

Note that, the `rpc-spec-types` package is now being exported from the main library because re-exporting that package in both `rpc` and `rpc-subscriptions` would be problematic for the main library that re-exports both.

Addresses #2983.

.changeset/giant-seals-mix.md

@@ -0,0 +1,6 @@
+---
+'@solana/rpc-spec-types': patch
+'@solana/rpc-spec': patch
+---
+
+Move RpcRequest and RpcResponse types to rpc-spec-types

packages/library/package.json

@@ -86,6 +86,7 @@
         "@solana/rpc-parsed-types": "workspace:*",
         "@solana/rpc-subscriptions": "workspace:*",
         "@solana/rpc-types": "workspace:*",
+        "@solana/rpc-spec-types": "workspace:*",
         "@solana/signers": "workspace:*",
         "@solana/sysvars": "workspace:*",
         "@solana/transaction-confirmation": "workspace:*",

packages/library/src/index.ts

@@ -10,6 +10,7 @@ export * from '@solana/rpc';
 export * from '@solana/rpc-parsed-types';
 export * from '@solana/rpc-subscriptions';
 export * from '@solana/rpc-types';
+export * from '@solana/rpc-spec-types';
 export * from '@solana/signers';
 export * from '@solana/transaction-messages';
 export * from '@solana/transactions';

packages/rpc-spec-types/README.md

@@ -14,4 +14,25 @@
 
 # @solana/rpc-spec-types
 
-TODO
+This package contains core types that can be used on both RPC and RPC Subscriptions specifications. It can be used standalone, but it is also exported as part of the Solana JavaScript SDK [`@solana/web3.js@rc`](https://github.com/solana-labs/solana-web3.js/tree/master/packages/library).
+
+## Types
+
+### `RpcRequest`
+
+An object that describes the elements of an RPC or RPC Subscriptions request. It consists of the following properties:
+
+-   `methodName`: The name of the RPC method or subscription requested.
+-   `params`: The parameters to be passed to the RPC server.
+
+### `RpcRequestTransformer`
+
+A function that accepts an `RpcRequest` and returns another `RpcRequest`. This allows the `RpcApi` to transform the request before it is sent to the RPC server.
+
+### `RpcResponse`
+
+A type that represents the response from an RPC server. This could be any sort of data which is why `RpcResponse` defaults to `unknown`. You may use a type parameter to specify the shape of the response — e.g. `RpcResponse<{ result: number }>`.
+
+### `RpcResponseTransformer`
+
+A function that accepts an `RpcResponse` and returns another `RpcResponse`. This allows the `RpcApi` to transform the response before it is returned to the caller.

packages/rpc-spec-types/src/index.ts

@@ -1,4 +1,5 @@
 export * from './overloads';
 export * from './rpc-message';
+export * from './rpc-request';
 export * from './rpc-response';
 export * from './type-helpers';

packages/rpc-spec/src/rpc-shared.ts → packages/rpc-spec-types/src/rpc-request.ts

@@ -3,12 +3,6 @@ export type RpcRequest<TParams = unknown> = {
     readonly params: TParams;
 };
 
-export type RpcResponse<TResponse = unknown> = TResponse;
-
 export type RpcRequestTransformer = {
     <TParams>(request: RpcRequest<TParams>): RpcRequest;
 };
-
-export type RpcResponseTransformer<TResponse = unknown> = {
-    (response: RpcResponse, request: RpcRequest): RpcResponse<TResponse>;
-};

packages/rpc-spec-types/src/rpc-response.ts

@@ -1,3 +1,11 @@
+import type { RpcRequest } from './rpc-request';
+
+export type RpcResponse<TResponse = unknown> = TResponse;
+
+export type RpcResponseTransformer<TResponse = unknown> = {
+    (response: RpcResponse, request: RpcRequest): RpcResponse<TResponse>;
+};
+
 interface IHasIdentifier {
     readonly id: number;
 }

packages/rpc-spec/README.md

@@ -41,25 +41,6 @@ Calling the `send(options)` method on a `PendingRpcRequest` will trigger the req
 
 An object that exposes all of the functions described by `TRpcMethods`, and fulfils them using `TRpcTransport`. Calling each method returns a `PendingRpcRequest<TResponse>` where `TResponse` is that method's response type.
 
-### `RpcRequest`
-
-An object that describes the elements of a JSON RPC request. It consists of the following properties:
-
--   `methodName`: The name of the JSON RPC method to be called.
--   `params`: The parameters to be passed to the JSON RPC method.
-
-### `RpcRequestTransformer`
-
-A function that accepts an `RpcRequest` and returns another `RpcRequest`. This allows the `RpcApi` to transform the request before it is sent to the JSON RPC server.
-
-### `RpcResponse`
-
-A type that represents the response from a JSON RPC server. This could be any sort of data which is why `RpcResponse` defaults to `unknown`. You may use a type parameter to specify the shape of the response — e.g. `RpcResponse<{ result: number }>`.
-
-### `RpcResponseTransformer`
-
-A function that accepts an `RpcResponse` and returns another `RpcResponse`. This allows the `RpcApi` to transform the response before it is returned to the caller.
-
 ### `RpcApi<TRpcMethods>`
 
 For each of `TRpcMethods` this object exposes a method with the same name that maps between its input arguments and a `RpcApiRequestPlan<TResponse>` that describes how to prepare a JSON RPC request to fetch `TResponse`.

packages/rpc-spec/src/__tests__/rpc-api-test.ts

@@ -1,7 +1,8 @@
 import '@solana/test-matchers/toBeFrozenObject';
 
+import type { RpcRequest, RpcResponse } from '@solana/rpc-spec-types';
+
 import { createJsonRpcApi } from '../rpc-api';
-import { RpcRequest, RpcResponse } from '../rpc-shared';
 
 type DummyApi = {
     someMethod(...args: unknown[]): unknown;

packages/rpc-spec/src/index.ts

@@ -1,4 +1,3 @@
 export * from './rpc';
 export * from './rpc-api';
-export * from './rpc-shared';
 export * from './rpc-transport';

packages/rpc-spec/src/rpc-api.ts

@@ -1,6 +1,10 @@
-import { Callable, createRpcMessage } from '@solana/rpc-spec-types';
-
-import { RpcRequestTransformer, RpcResponse, RpcResponseTransformer } from './rpc-shared';
+import {
+    Callable,
+    createRpcMessage,
+    RpcRequestTransformer,
+    RpcResponse,
+    RpcResponseTransformer,
+} from '@solana/rpc-spec-types';
 
 export type RpcApiConfig = Readonly<{
     requestTransformer?: RpcRequestTransformer;

packages/rpc-spec/src/rpc-transport.ts

@@ -1,4 +1,4 @@
-import { RpcResponse } from './rpc-shared';
+import { RpcResponse } from '@solana/rpc-spec-types';
 
 type RpcTransportRequest = Readonly<{
     payload: unknown;

packages/rpc-transformers/package.json

@@ -73,7 +73,7 @@
     "dependencies": {
         "@solana/errors": "workspace:*",
         "@solana/functional": "workspace:*",
-        "@solana/rpc-spec": "workspace:*",
+        "@solana/rpc-spec-types": "workspace:*",
         "@solana/rpc-subscriptions-spec": "workspace:*",
         "@solana/rpc-types": "workspace:*"
     },

packages/rpc-transformers/src/__tests__/request-transformer-test.ts

@@ -1,4 +1,4 @@
-import type { RpcRequestTransformer } from '@solana/rpc-spec';
+import type { RpcRequestTransformer } from '@solana/rpc-spec-types';
 import type { Commitment } from '@solana/rpc-types';
 
 import { getDefaultRequestTransformerForSolanaRpc } from '../request-transformer';

packages/rpc-transformers/src/__tests__/response-transformer-test.ts

@@ -1,5 +1,5 @@
 import { SOLANA_ERROR__JSON_RPC__PARSE_ERROR, SolanaError } from '@solana/errors';
-import { RpcRequest } from '@solana/rpc-spec';
+import { RpcRequest } from '@solana/rpc-spec-types';
 
 import { getDefaultResponseTransformerForSolanaRpc } from '../response-transformer';
 import { KEYPATH_WILDCARD } from '../tree-traversal';

packages/rpc-transformers/src/request-transformer-default-commitment.ts

@@ -1,4 +1,4 @@
-import type { RpcRequest, RpcRequestTransformer } from '@solana/rpc-spec';
+import type { RpcRequest, RpcRequestTransformer } from '@solana/rpc-spec-types';
 import type { Commitment } from '@solana/rpc-types';
 
 export function getDefaultCommitmentRequestTransformer({

packages/rpc-transformers/src/request-transformer-integer-overflow.ts

@@ -1,4 +1,4 @@
-import { RpcRequest } from '@solana/rpc-spec';
+import { RpcRequest } from '@solana/rpc-spec-types';
 
 import { getTreeWalkerRequestTransformer, KeyPath, TraversalState } from './tree-traversal';
 

packages/rpc-transformers/src/request-transformer.ts

@@ -1,5 +1,5 @@
 import { pipe } from '@solana/functional';
-import { RpcRequest, RpcRequestTransformer } from '@solana/rpc-spec';
+import { RpcRequest, RpcRequestTransformer } from '@solana/rpc-spec-types';
 import { Commitment } from '@solana/rpc-types';
 
 import { getBigIntDowncastRequestTransformer } from './request-transformer-bigint-downcast';

packages/rpc-transformers/src/response-transformer-result.ts

@@ -1,4 +1,4 @@
-import { RpcResponseTransformer } from '@solana/rpc-spec';
+import { RpcResponseTransformer } from '@solana/rpc-spec-types';
 
 type JsonRpcResponse = { result: unknown };
 

packages/rpc-transformers/src/response-transformer-throw-solana-error.ts

@@ -1,5 +1,5 @@
 import { getSolanaErrorFromJsonRpcError } from '@solana/errors';
-import { RpcResponseTransformer } from '@solana/rpc-spec';
+import { RpcResponseTransformer } from '@solana/rpc-spec-types';
 
 type JsonRpcResponse = { error: Parameters<typeof getSolanaErrorFromJsonRpcError>[0] } | { result: unknown };
 

packages/rpc-transformers/src/response-transformer.ts

@@ -1,5 +1,5 @@
 import { pipe } from '@solana/functional';
-import { RpcRequest, RpcResponse, RpcResponseTransformer } from '@solana/rpc-spec';
+import { RpcRequest, RpcResponse, RpcResponseTransformer } from '@solana/rpc-spec-types';
 
 import { AllowedNumericKeypaths } from './response-transformer-allowed-numeric-values';
 import { getBigIntUpcastResponseTransformer, getBigIntUpcastVisitor } from './response-transformer-bigint-upcast';

packages/rpc-transformers/src/tree-traversal.ts

@@ -1,4 +1,4 @@
-import { RpcRequest, RpcRequestTransformer, RpcResponseTransformer } from '@solana/rpc-spec';
+import { RpcRequest, RpcRequestTransformer, RpcResponseTransformer } from '@solana/rpc-spec-types';
 
 export type KeyPathWildcard = { readonly __brand: unique symbol };
 export type KeyPath = ReadonlyArray<KeyPath | KeyPathWildcard | number | string>;

packages/rpc-transport-http/README.md

@@ -127,7 +127,8 @@ Using this core transport, you can implement specialized functionality for lever
 Here’s an example of how someone might implement a “round robin” approach to distribute requests to multiple transports:
 
 ```ts
-import { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import { RpcTransport } from '@solana/rpc-spec';
+import { RpcResponse } from '@solana/rpc-spec-types';
 import { createHttpTransport } from '@solana/rpc-transport-http';
 
 // Create a transport for each RPC server
@@ -153,7 +154,8 @@ Another example of a possible customization for a transport is to shard requests
 Perhaps your application needs to make a large number of requests, or needs to fan request for different methods out to different servers. Here’s an example of an implementation that does the latter:
 
 ```ts
-import { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import { RpcTransport } from '@solana/rpc-spec';
+import { RpcResponse } from '@solana/rpc-spec-types';
 import { createHttpTransport } from '@solana/rpc-transport-http';
 
 // Create multiple transports
@@ -190,7 +192,8 @@ async function shardingTransport<TResponse>(...args: Parameters<RpcTransport>):
 The transport library can also be used to implement custom retry logic on any request:
 
 ```ts
-import { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import { RpcTransport } from '@solana/rpc-spec';
+import { RpcResponse } from '@solana/rpc-spec-types';
 import { createHttpTransport } from '@solana/rpc-transport-http';
 
 // Set the maximum number of attempts to retry a request
@@ -234,7 +237,8 @@ async function retryingTransport<TResponse>(...args: Parameters<RpcTransport>):
 Here’s an example of some failover logic integrated into a transport:
 
 ```ts
-import { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import { RpcTransport } from '@solana/rpc-spec';
+import { RpcResponse } from '@solana/rpc-spec-types';
 import { createHttpTransport } from '@solana/rpc-transport-http';
 
 // Create a transport for each RPC server

packages/rpc-transport-http/package.json

@@ -74,6 +74,7 @@
     "dependencies": {
         "@solana/errors": "workspace:*",
         "@solana/rpc-spec": "workspace:*",
+        "@solana/rpc-spec-types": "workspace:*",
         "undici-types": "^6.20.0"
     },
     "devDependencies": {

packages/rpc-transport-http/src/http-transport.ts

@@ -1,5 +1,6 @@
 import { SOLANA_ERROR__RPC__TRANSPORT_HTTP_ERROR, SolanaError } from '@solana/errors';
-import { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import type { RpcTransport } from '@solana/rpc-spec';
+import type { RpcResponse } from '@solana/rpc-spec-types';
 import type Dispatcher from 'undici-types/dispatcher';
 
 import {

packages/rpc/package.json

@@ -76,6 +76,7 @@
         "@solana/functional": "workspace:*",
         "@solana/rpc-api": "workspace:*",
         "@solana/rpc-spec": "workspace:*",
+        "@solana/rpc-spec-types": "workspace:*",
         "@solana/rpc-transformers": "workspace:*",
         "@solana/rpc-transport-http": "workspace:*",
         "@solana/rpc-types": "workspace:*"

packages/rpc/src/__tests__/rpc-request-coalescer-test.ts

@@ -1,4 +1,5 @@
-import type { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import type { RpcTransport } from '@solana/rpc-spec';
+import type { RpcResponse } from '@solana/rpc-spec-types';
 
 import { getRpcTransportWithRequestCoalescing } from '../rpc-request-coalescer';
 

packages/rpc/src/rpc-request-coalescer.ts

@@ -1,4 +1,5 @@
-import type { RpcResponse, RpcTransport } from '@solana/rpc-spec';
+import type { RpcTransport } from '@solana/rpc-spec';
+import type { RpcResponse } from '@solana/rpc-spec-types';
 
 type CoalescedRequest = {
     readonly abortController: AbortController;