diff --git a/test/integration/typescript-filtered-files/test/index.test.js b/test/integration/typescript-filtered-files/test/index.test.ts
similarity index 100%
rename from test/integration/typescript-filtered-files/test/index.test.js
rename to test/integration/typescript-filtered-files/test/index.test.ts
diff --git a/test/integration/typescript-hmr/test/index.test.js b/test/integration/typescript-hmr/test/index.test.ts
similarity index 90%
rename from test/integration/typescript-hmr/test/index.test.js
rename to test/integration/typescript-hmr/test/index.test.ts
index 1249349bc9ac0..effa97fa3a7e8 100644
--- a/test/integration/typescript-hmr/test/index.test.js
+++ b/test/integration/typescript-hmr/test/index.test.ts
@@ -24,7 +24,7 @@ describe('TypeScript HMR', () => {
         // Events can be finicky in CI. This switches to a more reliable
         // polling method.
         CHOKIDAR_USEPOLLING: 'true',
-        CHOKIDAR_INTERVAL: 500,
+        CHOKIDAR_INTERVAL: '500',
       },
     })
   })
@@ -102,18 +102,10 @@ describe('TypeScript HMR', () => {
         await new Promise((resolve) => setTimeout(resolve, 500))
       }
       await fs.writeFile(pagePath, errContent)
-      const res = await check(
-        async () => {
-          const html = await browser.eval(
-            'document.querySelector("p").innerText'
-          )
-          return html.match(/hello with error/) ? 'success' : 'fail'
-        },
-        /success/,
-        false
-      )
-
-      expect(res).toBe(true)
+      await check(async () => {
+        const html = await browser.eval('document.querySelector("p").innerText')
+        return html.match(/hello with error/) ? 'success' : 'fail'
+      }, /success/)
     } finally {
       if (browser) browser.close()
       await fs.writeFile(pagePath, origContent)
diff --git a/test/integration/typescript-ignore-errors/test/index.test.js b/test/integration/typescript-ignore-errors/test/index.test.ts
similarity index 100%
rename from test/integration/typescript-ignore-errors/test/index.test.js
rename to test/integration/typescript-ignore-errors/test/index.test.ts
diff --git a/test/integration/typescript-only-remove-type-imports/test/index.test.js b/test/integration/typescript-only-remove-type-imports/test/index.test.ts
similarity index 100%
rename from test/integration/typescript-only-remove-type-imports/test/index.test.js
rename to test/integration/typescript-only-remove-type-imports/test/index.test.ts
diff --git a/test/integration/typescript-paths/test/index.test.js b/test/integration/typescript-paths/test/index.test.ts
similarity index 98%
rename from test/integration/typescript-paths/test/index.test.js
rename to test/integration/typescript-paths/test/index.test.ts
index aeb3c297dd627..d8f0f18188614 100644
--- a/test/integration/typescript-paths/test/index.test.js
+++ b/test/integration/typescript-paths/test/index.test.ts
@@ -16,7 +16,7 @@ const appDir = join(__dirname, '..')
 let appPort
 let app
 
-async function get$(path, query) {
+async function get$(path, query?: any) {
   const html = await renderViaHTTP(appPort, path, query)
   return cheerio.load(html)
 }
diff --git a/test/integration/typescript-workspaces-paths/packages/www/test/index.test.js b/test/integration/typescript-workspaces-paths/packages/www/test/index.test.ts
similarity index 97%
rename from test/integration/typescript-workspaces-paths/packages/www/test/index.test.js
rename to test/integration/typescript-workspaces-paths/packages/www/test/index.test.ts
index f7100467a1462..5d7c6ff11f023 100644
--- a/test/integration/typescript-workspaces-paths/packages/www/test/index.test.js
+++ b/test/integration/typescript-workspaces-paths/packages/www/test/index.test.ts
@@ -8,7 +8,7 @@ const appDir = join(__dirname, '..')
 let appPort
 let app
 
-async function get$(path, query) {
+async function get$(path, query?: any) {
   const html = await renderViaHTTP(appPort, path, query)
   return cheerio.load(html)
 }
diff --git a/test/integration/typescript-workspaces-paths/tsconfig.json b/test/integration/typescript-workspaces-paths/tsconfig.json
index 7e3c7e3e2d3a2..abae98debe7b4 100644
--- a/test/integration/typescript-workspaces-paths/tsconfig.json
+++ b/test/integration/typescript-workspaces-paths/tsconfig.json
@@ -27,5 +27,6 @@
     "moduleResolution": "bundler",
     "resolveJsonModule": true,
     "isolatedModules": true
-  }
+  },
+  "exclude": ["node_modules", "**/*.test.ts", "**/*.test.tsx"]
 }
diff --git a/test/integration/undefined-webpack-config/test/index.test.js b/test/integration/undefined-webpack-config/test/index.test.ts
similarity index 94%
rename from test/integration/undefined-webpack-config/test/index.test.js
rename to test/integration/undefined-webpack-config/test/index.test.ts
index 5563bdc4c6f6c..e50d13c602dac 100644
--- a/test/integration/undefined-webpack-config/test/index.test.js
+++ b/test/integration/undefined-webpack-config/test/index.test.ts
@@ -31,9 +31,6 @@ const expectedErr =
         onStderr(msg) {
           output += msg || ''
         },
-        ontStdout(msg) {
-          output += msg || ''
-        },
       })
 
       expect(output).toMatch(expectedErr)
diff --git a/test/integration/webpack-bun-externals/test/index.test.js b/test/integration/webpack-bun-externals/test/index.test.ts
similarity index 100%
rename from test/integration/webpack-bun-externals/test/index.test.js
rename to test/integration/webpack-bun-externals/test/index.test.ts
diff --git a/test/integration/webpack-config-extensionalias/test/index.test.js b/test/integration/webpack-config-extensionalias/test/index.test.ts
similarity index 100%
rename from test/integration/webpack-config-extensionalias/test/index.test.js
rename to test/integration/webpack-config-extensionalias/test/index.test.ts
diff --git a/test/integration/webpack-config-mainjs/test/index.test.js b/test/integration/webpack-config-mainjs/test/index.test.ts
similarity index 100%
rename from test/integration/webpack-config-mainjs/test/index.test.js
rename to test/integration/webpack-config-mainjs/test/index.test.ts
diff --git a/test/integration/webpack-require-hook/test/index.test.js b/test/integration/webpack-require-hook/test/index.test.ts
similarity index 100%
rename from test/integration/webpack-require-hook/test/index.test.js
rename to test/integration/webpack-require-hook/test/index.test.ts
diff --git a/test/integration/with-electron/test/index.test.js b/test/integration/with-electron/test/index.test.ts
similarity index 100%
rename from test/integration/with-electron/test/index.test.js
rename to test/integration/with-electron/test/index.test.ts
diff --git a/test/integration/worker-webpack5/test/index.test.js b/test/integration/worker-webpack5/test/index.test.ts
similarity index 100%
rename from test/integration/worker-webpack5/test/index.test.js
rename to test/integration/worker-webpack5/test/index.test.ts
diff --git a/test/production/jest/rsc/lib/utils.test.js b/test/production/jest/rsc/lib/utils.test.ts
similarity index 100%
rename from test/production/jest/rsc/lib/utils.test.js
rename to test/production/jest/rsc/lib/utils.test.ts