Slack's Developer Experience team improved their end-to-end testing pipeline, achieving a significant 60% reduction in frontend build frequency and a 50% decrease in build time. These optimizations allowed for faster and more efficient iterations in the CI/CD process. By introducing a conditional frontend build mechanism, the team minimized unnecessary builds when no frontend changes were made, using git diff for speedy detection. This process also reused prebuilt assets stored in AWS S3, overcoming challenges in managing over 100,000 tracked files in their monorepo.
These enhancements, the team claims, streamline the continuous integration and deployment (CI/CD) process, allowing engineers to iterate more rapidly and efficiently.
To address this inefficiency, the team introduced a conditional frontend build mechanism. Using git diff with the three-dot notation, they could detect whether a PR included frontend changes.
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