Error appear when i'm trying to execute script responsable to run tests.

[tiago-ilha]

Describe the bug
TypeError: Jest: a transform must export something.
at /Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/transform/build/ScriptTransformer.js:386:19
at async Promise.all (index 0)
at async ScriptTransformer.loadTransformers (/Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/transform/build/ScriptTransformer.js:378:5)
at async createScriptTransformer (/Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/transform/build/ScriptTransformer.js:1106:3)
at async /Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/core/build/TestScheduler.js:269:31
at async Promise.all (index 0)
at async TestScheduler.scheduleTests (/Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/core/build/TestScheduler.js:262:5)
at async runJest (/Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/core/build/runJest.js:387:19)
at async _run10000 (/Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/core/build/cli/index.js:408:7)
at async runCLI (/Users/tiagooliveira/workstation/testandoJesSchematics/node_modules/@jest/core/build/cli/index.js:261:3)

Test Suites: 0 of 2 total
Tests: 0 total
Snapshots: 0 total
Time: 0 s%

To Reproduce
Steps to reproduce the behavior:

1. Create a new Angular 12 project with --create-application=false
2. Create a library ... ng g library somelib
3. Add @briebug/jest-schematic ... ng add @briebug/jest-schematic
4. Execute tests by command ... ng test

Expected behavior
When the command ng test is execute the tests must run.

Screenshots

Desktop (please complete the following information):

• OS: [e.g. Mac]
• Node version: [e.g. 14.17.0]
• NPM or Yarn version [e.g. Yarn 6.14.13]
• App type [e.g. Angular CLI]
• Angular version [e.g. @angular/core: "12.0.3"]

Additional context
Add any other context about the problem here.