test(truapi): run the suite with bun test instead of Vitest

Use Bun's built-in test runner: the repo already depends on bun, so this
drops the Vitest devDependency (and its config) while keeping the same
product-sdk-style describe/it/expect tests.

- Imports come from "bun:test"; add @types/bun for editor support.
- test script runs `bun test` (auto-discovers src/**/*.test.ts, no config).
- Restore the setup-bun step on the ts-client CI job.
- Refresh docs and the ts-client-checks skill.

Author: pgherveou

.claude/skills/ts-client-checks/SKILL.md

@@ -1,6 +1,6 @@
 ---
 name: ts-client-checks
-description: Build and smoke-test the @parity/truapi TypeScript package (tsc + Vitest). Use after regenerating the client or after touching js/packages/truapi/.
+description: Build and smoke-test the @parity/truapi TypeScript package (tsc + bun test). Use after regenerating the client or after touching js/packages/truapi/.
 ---
 
 # `@parity/truapi` build + smoke tests
@@ -13,13 +13,14 @@ npm run build
 npm test
 ```
 
-`npm test` runs the [Vitest](https://vitest.dev/) suite (`src/**/*.test.ts`),
-which loads the source `.ts` files directly (no build step required).
+`npm test` runs the [`bun test`](https://bun.sh/docs/cli/test) suite
+(`src/**/*.test.ts`) directly against the source `.ts` files (no build step
+required), so bun must be installed.
 
 Expected:
 
 - `tsc` (the `build` step) exits cleanly with no diagnostics.
-- Vitest reports `Test Files  N passed` / `Tests  M passed` with no failures.
+- `bun test` reports `N pass` / `0 fail` across the `src/**/*.test.ts` files.
 - `src/wire-table.test.ts` emits one `round-trips <method>.<kind>` case per
   generated frame id. The case count tracks `WIRE_TABLE`: adding a method
   grows it by 2 (request + response) or 4 (subscribe).

.github/workflows/ci.yml

@@ -117,6 +117,10 @@ jobs:
         with:
           node-version: 22
 
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
+        with:
+          bun-version: latest
+
       - name: Download codegen output
         uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:

CLAUDE.md

@@ -80,7 +80,7 @@ cargo test --workspace
 ```bash
 cd js/packages/truapi
 npm run build
-npm test                # Vitest suite (src/**/*.test.ts)
+npm test                # bun test suite (src/**/*.test.ts)
 ```
 
 ### Explorer

docs/local-e2e-testing.md

@@ -105,7 +105,7 @@ npm test
 Expected:
 
 - `tsc` (the `build` step) exits cleanly with no diagnostics.
-- Vitest reports `Test Files  N passed` / `Tests  M passed` with no failures.
+- `bun test` reports `N pass` / `0 fail` across the `src/**/*.test.ts` files.
 - `src/wire-table.test.ts` emits one `round-trips <method>.<kind>` case per
   generated frame id; the count tracks `WIRE_TABLE`. When you add a method,
   it grows by 2 (request + response) or 4 (subscribe).

js/packages/truapi/README.md

@@ -127,7 +127,7 @@ npm run build
 npm test
 ```
 
-On a clean checkout, the first build or test run will generate the ignored TypeScript outputs from the Rust sources, so Rust stable + nightly must be installed locally. `npm test` runs the package's [Vitest](https://vitest.dev/) suite (`src/**/*.test.ts`), which loads the source `.ts` files directly without a build step.
+On a clean checkout, the first build or test run will generate the ignored TypeScript outputs from the Rust sources, so Rust stable + nightly must be installed locally. `npm test` runs the package's [`bun test`](https://bun.sh/docs/cli/test) suite (`src/**/*.test.ts`) directly against the source `.ts` files (no build step), so [bun](https://bun.sh/) must also be installed.
 
 ## License
 

js/packages/truapi/package.json

@@ -71,12 +71,12 @@
     "codegen": "cargo run -p truapi-codegen -- --input ../../../target/doc/truapi.json --output src/generated --playground-output src/playground --explorer-output src/explorer",
     "typecheck": "npm run build",
     "pretest": "npm run ensure-generated",
-    "test": "vitest run",
-    "test:watch": "vitest"
+    "test": "bun test",
+    "test:watch": "bun test --watch"
   },
   "devDependencies": {
-    "typescript": "^6.0",
-    "vitest": "^3.2.0"
+    "@types/bun": "^1.3.0",
+    "typescript": "^6.0"
   },
   "dependencies": {
     "neverthrow": "^8.2.0",

js/packages/truapi/src/client.test.ts

@@ -1,5 +1,5 @@
 import type { Result } from "neverthrow";
-import { describe, expect, it } from "vitest";
+import { describe, expect, it } from "bun:test";
 
 import { createTransport } from "./client.js";
 import { indexedTaggedUnion, Result as ScaleResult, str, _void } from "./scale.js";

js/packages/truapi/src/explorer/versions.test.ts

@@ -5,7 +5,7 @@
 // `DataType` in the same version. That cross-reference is the load-bearing
 // invariant the explorer site relies on for type navigation.
 
-import { describe, expect, it } from "vitest";
+import { describe, expect, it } from "bun:test";
 
 import { packageVersion, versions } from "./versions.js";
 

js/packages/truapi/src/transport.test.ts

@@ -1,4 +1,4 @@
-import { afterEach, beforeEach, describe, expect, it } from "vitest";
+import { afterEach, beforeEach, describe, expect, it } from "bun:test";
 
 import { createIframeProvider, createMessagePortProvider } from "./transport.js";
 

js/packages/truapi/src/wire-equality.test.ts

@@ -6,7 +6,7 @@
 // independently and compare.
 
 import type { Result } from "neverthrow";
-import { describe, expect, it } from "vitest";
+import { describe, expect, it } from "bun:test";
 
 import { str } from "./scale.js";
 import { decodeWireMessage, encodeWireMessage } from "./transport.js";