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test(cypress): defer ResizeObserver callbacks to next frame #60189

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Merged
susnux merged 1 commit into from
May 6, 2026
+13 −0
Merged

test(cypress): defer ResizeObserver callbacks to next frame #60189

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13 changes: 13 additions & 0 deletions cypress/support/e2e.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,3 +13,16 @@ import 'core-js/actual/promise/with-resolvers.js'
// @see https://github.com/cypress-io/cypress/issues/20341
Cypress.on('uncaught:exception', (err) => !err.message.includes('ResizeObserver loop limit exceeded'))
Cypress.on('uncaught:exception', (err) => !err.message.includes('ResizeObserver loop completed with undelivered notifications'))

// Defer ResizeObserver callbacks one frame to break floating UI sync loops
// that otherwise tank the renderer and trigger Electron's unresponsive kill.
Cypress.on('window:before:load', (win) => {
const Original = win.ResizeObserver
win.ResizeObserver = class extends Original {
constructor(callback: ResizeObserverCallback) {
super((entries, observer) => {
win.requestAnimationFrame(() => callback(entries, observer))
})
}
}
})
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