TypeScript type checks miss browser compatibility, causing runtime crashes

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A developer reported in February 2024 that using `replaceAll` in a Next.js app caused crashes on older browsers, despite TypeScript's type checker finding no issue. A similar problem occurred with Mermaid diagrams in May 2024 when using features like `structuredClone` on older Safari versions. The root cause is that TypeScript's standard type definitions assume modern browser features are present. A solution involves setting up a separate type-checking configuration using tools like `typescript-baseline-lib` to validate code against a specific browser support target. This creates an additional check in CI pipelines to catch compatibility issues before code is deployed.

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