back to jest, currently has the best experience

jest.config.js

@@ -0,0 +1,18 @@
+/** @type {import('@jest/types').Config.InitialOptions} */
+const config = {
+  transform: {
+    "^.+\\.tsx?$": [
+      "esbuild-jest",
+      {
+        format: "esm",
+        sourcemap: true,
+      },
+    ],
+  },
+  moduleNameMapper: {
+    "(^\\./.+)\\.js$": "$1",
+  },
+  extensionsToTreatAsEsm: [".ts", ".tsx"],
+}
+
+export default config

package.json

@@ -17,8 +17,8 @@
     "lint": "eslint --ext js,ts,tsx .",
     "lint-fix": "pnpm lint -- --fix",
     "format": "prettier --write .",
-    "test": "vitest",
-    "coverage": "vitest --coverage",
+    "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
+    "coverage": "pnpm test -- --coverage",
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
@@ -34,10 +34,15 @@
   },
   "devDependencies": {
     "@itsmapleleaf/configs": "^1.1.2",
+    "@types/jest": "^27.0.3",
     "@typescript-eslint/eslint-plugin": "^5.8.0",
     "@typescript-eslint/parser": "^5.8.0",
     "c8": "^7.10.0",
     "chai": "^4.3.4",
+    "discord.js": "^13.3.1",
+    "dotenv": "^10.0.0",
+    "esbuild": "^0.14.6",
+    "esbuild-jest": "^0.5.0",
     "eslint": "^8.5.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-import-resolver-typescript": "^2.5.0",
@@ -46,17 +51,13 @@
     "eslint-plugin-react": "^7.27.1",
     "eslint-plugin-react-hooks": "^4.3.0",
     "eslint-plugin-unicorn": "^39.0.0",
-    "prettier": "^2.5.1",
-    "should": "^13.2.3",
-    "typescript": "^4.5.4",
-    "vite": "^2.7.4",
-    "vitest": "^0.0.102",
-    "discord.js": "^13.3.1",
-    "dotenv": "^10.0.0",
-    "esbuild": "^0.14.6",
+    "jest": "^27.4.5",
     "nanoid": "^3.1.30",
+    "prettier": "^2.5.1",
     "react": "^17.0.2",
-    "tsup": "^5.11.6"
+    "should": "^13.2.3",
+    "tsup": "^5.11.6",
+    "typescript": "^4.5.4"
   },
   "eslintConfig": {
     "extends": [

src/helpers/deferred.test.ts

@@ -1,5 +1,4 @@
-import { expect, test } from "vitest"
-import { createDeferred } from "./deferred.js"
+import { createDeferred } from "./deferred"
 
 test("resolve", async () => {
   const deferred = createDeferred<string>()

src/rendering.test.tsx

@@ -1,9 +1,7 @@
 /* eslint-disable unicorn/no-null */
 import type { Message } from "discord.js"
 import { Client, TextChannel } from "discord.js"
-import { deepEqual } from "node:assert"
 import React from "react"
-import { afterAll, beforeAll, test } from "vitest"
 import { pick } from "./helpers/pick.js"
 import { raise } from "./helpers/raise.js"
 import type { ReacordRoot } from "./main"
@@ -150,8 +148,7 @@ function extractMessageData(message: Message) {
 async function assertMessages(expected: Array<DeepPartial<MessageData>>) {
   const messages = await channel.messages.fetch()
 
-  deepEqual(
-    messages.map((message) => extractMessageData(message)),
+  expect(messages.map((message) => extractMessageData(message))).toEqual(
     expected.map((message) => ({
       content: "",
       ...message,