Cypress v4.5.0 — Release Notes & Engineering Impact

Source available — automated, not human-reviewed

Component: cypress · Channel: stable. Automated analysis, not a compatibility certification. How this works.

Analysis updated: 2026-11-01.

Compatibility not verified — check source notes

📄 .MD

✨ Features 1 🔧 Bug Fixes 3

⚡ Executive Summary (TL;DR)

Cypress v4.5.0. Source highlight: *Released 4/28/2020*

Visit Cypress Official Site ↗ Official Release Source ↗ All Cypress Releases 📡 Cypress RSS

Who Does This Impact? (Role-Based Analysis)

💻 Software Engineers & Devs

Check the source notes against the package and APIs you use before upgrading.

📊 Product & Engineering Leads

Use the documented changes to assess relevance to your product; release frequency alone is not a quality measure.

⚙️ DevOps & Security

Verify the target version, runtime requirements and rollback procedure in the official documentation.

✨ New Features & Capabilities (1)

The update window in the Test Runner now encourages yarn users to `yarn upgrade` Cypress instead of `yarn add` to help prevent installing 2 versions of Cypress when using yarn workspaces. Addressed in #7101.

🔧 Bug Fixes & Patches (3)

Custom Mocha reporters will now correctly use the version of Mocha bundled with Cypress. Fixes #3537 and #6984.
We better account for word boundaries in application scripts when `modifyObstructiveCode` is `true`. Fixes #7138.
Fixed an issue where iterators in TypeScript were not properly transpiled. Fixes #7098.

📄 View Raw Release Notes (Original Developer Log)

*Released 4/28/2020* **Features:** - Cypress now supports the execution of component tests using framework-specific adaptors when setting the [`experimentalComponentTesting`](https://on.cypress.io/configuration#Experiments) configuration option to `true`. For more details see the [cypress-react-unit-test](https://github.com/bahmutov/cypress-react-unit-test) and [cypress-vue-unit-test](https://github.com/bahmutov/cypress-vue-unit-test/tree/feature/cypress-mount-mode) repos. Addresses [#5922](https://github.com/cypress-io/cypress/issues/5922) and [#6968](https://github.com/cypress-io/cypress/issues/6968). **Bugfixes:** - [Custom Mocha reporters](https://on.cypress.io/reporters) will now correctly use the version of Mocha bundled with Cypress. Fixes [#3537](https://github.com/cypress-io/cypress/issues/3537) and [#6984](https://github.com/cypress-io/cypress/issues/6984). - We better account for word boundaries in application scripts when `modifyObstructiveCode` is `true`. Fixes [#7138](https://github.com/cypress-io/cypress/issues/7138). - Fixed an issue where iterators in TypeScript were not properly transpiled. Fixes [#7098](https://github.com/cypress-io/cypress/issues/7098). **Misc:** - The update window in the Test Runner now encourages yarn users to `yarn upgrade` Cypress instead of `yarn add` to help prevent installing 2 versions of Cypress when using yarn workspaces. Addressed in [#7101](https://github.com/cypress-io/cypress/pull/7101). - We're continuing to make progress in converting our codebase from CoffeeScript to JavaScript. Addresses [#2690](https://github.com/cypress-io/cypress/issues/2690) in [#7031](https://github.com/cypress-io/cypress/pull/7031) and [#7097](https://github.com/cypress-io/cypress/pull/7097). **Dependency Updates:** - Upgraded `electron` from `8.2.0` to `8.2.3`. Addressed in [#7079](https://github.com/cypress-io/cypress/pull/7079).

← Older Version Cypress v4.4.1 Newer Version → Cypress v4.6.0