first commit

test/integration/jsconfig/jsconfig.json

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+{}

test/integration/jsconfig/pages/hello.js

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+export default () => <div>hello world</div>

test/integration/jsconfig/test/index.test.ts

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+/* eslint-env jest */
+
+import fs from 'fs-extra'
+import { join } from 'path'
+import { nextBuild } from 'next-test-utils'
+
+const appDir = join(__dirname, '..')
+
+describe('jsconfig.json', () => {
+  ;(process.env.TURBOPACK_DEV ? describe.skip : describe)(
+    'production mode',
+    () => {
+      it('should build normally', async () => {
+        const res = await await nextBuild(appDir, [], { stdout: true })
+        expect(res.stdout).toMatch(/Compiled successfully/)
+      })
+
+      it('should fail on invalid jsconfig.json', async () => {
+        const jsconfigPath = join(appDir, 'jsconfig.json')
+        const originalJsconfig = await fs.readFile(jsconfigPath, {
+          encoding: 'utf-8',
+        })
+        await fs.writeFile(jsconfigPath, '{', {
+          encoding: 'utf-8',
+        })
+        try {
+          const res = await nextBuild(appDir, [], { stderr: true })
+          if (process.env.IS_TURBOPACK_TEST) {
+            expect(res.stderr).toMatch(/An issue occurred while parsing/)
+            expect(res.stderr).toMatch(/jsconfig.json:1:1/)
+            expect(res.stderr).toMatch(
+              /tsconfig is not parseable: invalid JSON: Unterminated object/
+            )
+          } else {
+            expect(res.stderr).toMatch(/Error: Failed to parse "/)
+            expect(res.stderr).toMatch(/JSON5: invalid end of input at 1:2/)
+          }
+        } finally {
+          await fs.writeFile(jsconfigPath, originalJsconfig, {
+            encoding: 'utf-8',
+          })
+        }
+      })
+    }
+  )
+})