Replay is a new kind of browser that can record and deterministically replay web applications. Itโs likely that Replay can help you and your team in one of three ways.
- A better Chrome DevTools where itโs easier to get into a state of flow and understand how your software works.
- A bug reporting tool where the author does not need to worry about being misunderstood and the developer does not need to worry about replicating the issue locally.
- A test suite flake recorder where intermittent test failures in CI can be captured and fixed retroactively enabling faster and more reliable test runs.
What is Replay?
When you open a replay, youโre inspecting a browser thatโs running in the cloud exactly as it ran before. This sounds simple, but changes everything.
First, it means you can retroactively debug the application as if itโs running live. Want to know what the value of a variable was? You can add a print statement in Replay DevTools and the logs will be retroactively shown in the Console.
Second, it means you can debug with team members as if theyโre sitting next to you. Want to know why a function was called with a particular value? At mention a team member in a comment, and when they open the replay, theyโll be paused at the same line of code.
Lastly, it means that you can start time travel debugging. Want to know why a value changed or a function was called? Time travel debugging lets you explore your software in whole new ways that makes you feel like you have super powers.
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