first commit

test/integration/typescript-custom-tsconfig/next.config.js

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+module.exports = {
+  typescript: {
+    tsconfigPath: 'web.tsconfig.json',
+  },
+}

test/integration/typescript-custom-tsconfig/pages/index.tsx

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+export default function Index() {
+  return <p>Hello world</p>
+}

test/integration/typescript-custom-tsconfig/test/index.test.ts

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+/* eslint-env jest */
+
+import { join } from 'path'
+import { nextBuild } from 'next-test-utils'
+
+const appDir = join(__dirname, '..')
+
+const warnMessage = /Using tsconfig file:/
+
+;(process.env.IS_TURBOPACK_TEST ? describe.skip : describe)(
+  'Custom TypeScript Config',
+  () => {
+    ;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
+      'production mode',
+      () => {
+        it('should warn when using custom typescript path', async () => {
+          const { stdout } = await nextBuild(appDir, [], {
+            stdout: true,
+          })
+
+          expect(stdout).toMatch(warnMessage)
+        })
+      }
+    )
+  }
+)

test/integration/typescript-custom-tsconfig/web.tsconfig.json

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+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": true,
+    "skipLibCheck": true,
+    "strict": false,
+    "forceConsistentCasingInFileNames": true,
+    "noEmit": true,
+    "incremental": true,
+    "esModuleInterop": true,
+    "module": "esnext",
+    "moduleResolution": "bundler",
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "jsx": "react-jsx"
+  },
+  "include": ["next-env.d.ts", "**/*.ts", "**/*.tsx"],
+  "exclude": ["node_modules"]
+}