The blog post by Gleb Bahmutov provides a comprehensive guide on implementing code coverage for React applications created using Create React App (CRA) version 3, without the need to eject the default configuration. It introduces the @cypress/instrument-cra module, which simplifies the process of instrumenting the application to generate code coverage reports after running end-to-end tests with Cypress. The post includes a practical example using a small single-page application (SPA), demonstrating how to add code instrumentation, test writing, and coverage reporting. It explains the setup process for Cypress code coverage, including installing necessary plugins, configuring scripts, and handling network stubbing for non-existent APIs. Additionally, the post covers writing and running both end-to-end and unit tests to improve code coverage, ultimately achieving a coverage report of 96%. The guide also addresses challenges such as dynamic data handling and unused code detection, offering insights into efficiently managing code coverage in React applications.