May 2026 monthly highlights across AWS CDK, Playwright, and Vitest focusing on robustness, correctness, and testing. Key features delivered: - CachePolicy token handling unit test and guard improvements to CloudFront policy validation (aws/aws-cdk). Added unit test ensuring that unresolved token names longer than 128 chars do not trigger length validation, aligning with existing regex guards. Commit: 3b96e97af91701fc17e8c3ad35a8564d57085a9d. - HAR recording reliability improvements with robust cookie parsing for values containing '='. Added end-to-end test to verify preservation of cookie values in API requests (microsoft/playwright). Commit: f0ce6a07edb6935529309aa39072ff6e3cce8cd7. - AbortSignal listener lifecycle cleanup in withCancel to prevent memory leaks in the test runner (vitest-dev/vitest). Commit: ab09822a4fef07ddecfdce702bd21fcba7881198. Major bugs fixed: - CachePolicy unresolved token length validation: guard added before length check to avoid false negatives/positives when cachePolicyName is a token (aws/aws-cdk). Commit: 3b96e97af91701fc17e8c3ad35a8564d57085a9d. - HAR cookie parsing: fix ensuring values with '=' are preserved in HAR recordings (microsoft/playwright). Commit: f0ce6a07edb6935529309aa39072ff6e3cce8cd7. - withCancel memory leak: remove lingering AbortSignal listener to improve stability in long-running tests (vitest-dev/vitest). Commit: ab09822a4fef07ddecfdce702bd21fcba7881198. Overall impact and accomplishments: - Increased correctness and robustness across core tooling used for cloud infrastructure and browser automation, reducing runtime errors, flaky tests, and deployment risks. - Expanded test coverage for edge cases (unresolved tokens in CloudFormation, HAR cookie edge cases, and AbortSignal lifecycle), improving long-term maintainability and CI reliability. Technologies/skills demonstrated: - TypeScript/CDK internals, CloudFront and CloudFormation idiosyncrasies, unit testing strategies, HAR recording and parsing, memory management, and event listener lifecycle for Node.js-based runners.