vite build.rollupOptions.input custom entries not loaded in cypress

[knownasilya]

export default defineConfig({
  build: {
    rollupOptions: {
      input: {
        main: fileURLToPath(new URL('./index.html', import.meta.url)),
        checklist: fileURLToPath(
          new URL('./iframe-checklist.html', import.meta.url)
        ),
// ..

Test looks like so:

describe('Checklist', () => {
  beforeEach(() => {
    cy.stubCommonRoutes();
    cy.intercept('GET', '**/checklist_items', {
      fixture: 'checklist/checklist.json',
    }).as('getChecklist');
    cy.intercept('GET', '**/tasks*', {fixture: 'checklist/tasks.json'}).as(
      'getTasks'
    );
  });

  it('can see checklist items in /iframe-checklist', () => {
    cy.visit('/iframe-checklist.html?targetType=task&targetId=35941037');
    cy.wait(['@getChecklist', '@getTasks']);

    cy.get('.checklist-name').should('have.text', 'Not Complete');
    cy.get('.checklist-content .checklist-item').should('have.length', 2);

    cy.percySnapshot();
  });
});

The result is this:

the test hasn't changed, just migrated from webpack to vite. Note that the tests that are on 'main' work just fine.

EDIT: looks like I needed to tighten my globs for the fixtures since vite now serves a bunch more files and some matched the fixture glob. Changed it to this.

    cy.intercept('GET', '**v1/tasks*', {fixture: 'checklist/tasks.json'}).as(

Now I get TypeError: window.fetch is not a function

[knownasilya]

Looks like ultimately I needed better glob patterns for matching api fixtures, since vite served a bunch more files.
Also my non-main scripts needed import 'whatwg-fetch';