Nuxt storybook doesn't support object style path

[Roy-Ermers]

Version

@nuxtjs/storybook: 4.2.0
nuxt: 2.15.7

Steps to reproduce

Create an empty nuxt project with @nuxtjs/storybook installed.
set nuxt.config.js to this:

{
   ...
   storybook: {
      stories: [
          {
              directory: '~/stories',
              titlePrefix: 'Components',
              files: '*.stories.js',
          }
      ]
}

What is Expected?

Nuxtjs/storybook should work like the documentation on storybook says it should.

What is actually happening?

An error is printed in the console and the build stops.

ERR! TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received an instance of Object
ERR!     at new NodeError (node:internal/errors:371:5)
ERR!     at validateString (node:internal/validators:119:11)
ERR!     at Object.isAbsolute (node:path:1157:5)
ERR!     at /home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/preview/entries.js:88:54
ERR!     at Array.map (<anonymous>)
ERR!     at createPreviewEntry (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/preview/entries.js:87:44)
ERR!     at processTicksAndRejections (node:internal/process/task_queues:96:5)
ERR!     at async Object.entries (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/presets/preview-preset.js:24:26)
ERR!     at async getConfig (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/index.js:54:17)
ERR!     at async Object.start (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/index.js:95:16)
ERR!     at async Promise.all (index 0)
ERR!     at async storybookDevServer (/home/roy/source/components/node_modules/@storybook/core-server/dist/cjs/dev-server.js:123:28)
ERR!     at async buildDevStandalone (/home/roy/source/components/node_modules/@storybook/core-server/dist/cjs/build-dev.js:112:31)
ERR!     at async buildDev (/home/roy/source/components/node_modules/@storybook/core-server/dist/cjs/build-dev.js:154:5)
ERR!  TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received an instance of Object
ERR!     at new NodeError (node:internal/errors:371:5)
ERR!     at validateString (node:internal/validators:119:11)
ERR!     at Object.isAbsolute (node:path:1157:5)
ERR!     at /home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/preview/entries.js:88:54
ERR!     at Array.map (<anonymous>)
ERR!     at createPreviewEntry (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/preview/entries.js:87:44)
ERR!     at processTicksAndRejections (node:internal/process/task_queues:96:5)
ERR!     at async Object.entries (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/presets/preview-preset.js:24:26)
ERR!     at async getConfig (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/index.js:54:17)
ERR!     at async Object.start (/home/roy/source/components/node_modules/@storybook/builder-webpack4/dist/cjs/index.js:95:16)
ERR!     at async Promise.all (index 0)
ERR!     at async storybookDevServer (/home/roy/source/components/node_modules/@storybook/core-server/dist/cjs/dev-server.js:123:28)
ERR!     at async buildDevStandalone (/home/roy/source/components/node_modules/@storybook/core-server/dist/cjs/build-dev.js:112:31)
ERR!     at async buildDev (/home/roy/source/components/node_modules/@storybook/core-server/dist/cjs/build-dev.js:154:5) {
ERR!   code: 'ERR_INVALID_ARG_TYPE'
ERR! }