Exception when using pdf-visual-diff

[serhiy-yevtushenko]

When trying to use pdf-visual-diff, I obtain the following exception (paths in stacktrace shortened to remove project-specific information):

TypeError: A dynamic import callback was invoked without --experimental-vm-modules
    at importModuleDynamicallyCallback (node:internal/modules/esm/utils:263:11)
    at pdf2png (...\node_modules\pdf-visual-diff\src\pdf2png\pdf2png.ts:74:27)
    at handleMissingSnapshot (...\node_modules\pdf-visual-diff\src\compare-pdf-to-snapshot.ts:212:31)
    at comparePdfToSnapshot (...\node_modules\pdf-visual-diff\src\compare-pdf-to-snapshot.ts:152:12) {
  code: 'ERR_VM_DYNAMIC_IMPORT_CALLBACK_MISSING_FLAG'
}

I'm trying to use pdf-visual-diff with jest typescript testing framework.

It would be good to document the proper way to configure jest to avoid such exceptions.

Operating system: Windows 11,
"pdf-visual-diff" version - "^0.14.0",

[moshensky]

Hi @serhiy-yevtushenko,

This lib relies on the usage of dynamic import(). There is a sample esm_jest_and_node_test_runners. Although it is not TS check if it will help you out. Please note that when test are executed they are started with "test:jest": "node --experimental-vm-modules node_modules/jest/bin/jest.js ./src/jest_test_runner.test.js", the afford mentioned --experimental-vm-modules.