update: support storybook 9

[chr33s]

closes: #30944

[chr33s]

@JohnAlbin that time of year again, this adds storybook 9 support, it introduces backwards incompatible changes so best to update readme & bump version.

[chr33s]

sorry for GitHub actions noise. I updated the dependencies as well in https://github.com/chr33s/storybook-addon-fetch-mock/tree/update . Opted to keep it separate to not pollute this pr's purpose.

[Copilot]

Pull Request Overview

This PR updates the storybook-addon-fetch-mock library to support Storybook 9, involving significant API changes and modernization of the codebase.

• Updates fetch-mock API calls to use new v12 syntax (route() instead of mock(), hardReset() instead of reset())
• Migrates from legacy Storybook imports to new v9 internal module structure
• Modernizes build tooling with Vite configuration and ESLint flat config

Reviewed Changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
package.json	Updates dependencies to Storybook 9 and fetch-mock 12, changes package name and repository
src/withFetchMock.ts	Updates fetch-mock API calls and import paths for Storybook 9 compatibility
src/preview.ts	Updates Storybook type imports to use internal module paths
eslint.config.js	Migrates from legacy .eslintrc.cjs to modern flat config format
.storybook/main.ts	Adds Storybook configuration for testing the addon
tests/	Adds test components and stories to verify addon functionality
vite.config.ts	Adds Vite configuration for modern build tooling

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[Copilot]

Using call.url as the object key could cause collisions if multiple calls are made to the same URL. The original code used call.identifier which would be unique. Consider using a combination of URL and index or timestamp to ensure uniqueness.

Suggested change

	fetchMock.callHistory.calls().forEach((call) => {
	calls[call.url] = call;
	fetchMock.callHistory.calls().forEach((call, i) => {
	const key = call.identifier ? call.identifier : `${call.url}-${i}`;
	calls[key] = call;

[Copilot]

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[shooftie]

I fully sympathise with the situation that the @JohnAlbin finds himself in and so am asking this as gently as possible; @chr33s, do you have any idea when this might be merged? I've just upgraded to v9 and this has become the proverbial "fly in the ointment".