storybook: Storyshots: running `initStoryshots` fails with "require.requireActual is not a function"

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Bug or support request summary

Created a new project for the documentation software, and got an error when running the test (step 2).

Steps to reproduce

1. https://www.learnstorybook.com/intro-to-storybook/svelte/en/get-started/
2. https://www.learnstorybook.com/intro-to-storybook/svelte/en/simple-component/

Please specify which version of Storybook and optionally any affected addons that you’re running

//* package.json *//

{
  "name": "svelte-app",
  "version": "0.0.1",
  "scripts": {
    "build": "rollup -c",
    "dev": "rollup -c -w",
    "start": "sirv public",
    "storybook": "start-storybook -p 6006 -s public",
    "build-storybook": "build-storybook",
    "test": "jest --watchAll"
  },
  "dependencies": {
    "sirv-cli": "^0.4.4"
  },
  "devDependencies": {
    "@babel/core": "^7.9.6",
    "@rollup/plugin-commonjs": "^12.0.0",
    "@rollup/plugin-node-resolve": "^8.0.0",
    "@storybook/addon-actions": "^5.3.19",
    "@storybook/addon-links": "^5.3.19",
    "@storybook/addon-storyshots": "^5.3.19",
    "@storybook/addons": "^5.3.19",
    "@storybook/svelte": "^5.3.19",
    "@testing-library/jest-dom": "^5.8.0",
    "@testing-library/svelte": "^3.0.0",
    "babel-loader": "^8.1.0",
    "jest": "^26.0.1",
    "jest-transform-svelte": "^2.1.1",
    "rollup": "^2.3.4",
    "rollup-plugin-livereload": "^1.0.0",
    "rollup-plugin-svelte": "^5.0.3",
    "rollup-plugin-terser": "^5.1.2",
    "svelte": "^3.22.3",
    "svelte-loader": "^2.13.6"
  },
  "jest": {
    "transform": {
        "^.+\\.js$": "babel-jest",
        "^.+\\.stories\\.[jt]sx?$": "<rootDir>node_modules/@storybook/addon-storyshots/injectFileName",
        "^.+\\.svelte$": "jest-transform-svelte"
      },
      "setupFilesAfterEnv": [
        "@testing-library/jest-dom/extend-expect"
      ]
  }
}

Screenshots / Screencast / Code Snippets (Optional)

Test code:

import initStoryshots from '@storybook/addon-storyshots';

initStoryshots();

Error stack:

 PASS  tests/sample.test.js
 FAIL  tests/storybook.test.js
  ● Test suite failed to run

    TypeError: require.requireActual is not a function

      1 | import initStoryshots from '@storybook/addon-storyshots';
      2 |
    > 3 | initStoryshots();
        | ^

      at Object.load (node_modules/@storybook/addon-storyshots/dist/frameworks/svelte/loader.js:25:29)
      at Object.loadFramework [as default] (node_modules/@storybook/addon-storyshots/dist/frameworks/frameworkLoader.js:26:19)
      at testStorySnapshots (node_modules/@storybook/addon-storyshots/dist/api/index.js:48:39)
      at Object.<anonymous> (tests/storybook.test.js:3:1)

Test Suites: 1 failed, 1 passed, 2 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        8.368 s
Ran all test suites.