Worked on the swc-project/swc repository to deliver a targeted fix for the JavaScript minifier, addressing a correctness issue involving the transformation of Number(x) to +x. Using Rust and backend development skills, the solution ensured that this conversion only occurs when both unsafe and unsafe_math flags are enabled, aligning the tool’s behavior with terser and preventing potential BigInt TypeErrors. The work included adding comprehensive tests to cover regression scenarios and stabilizing continuous integration across multiple crates. All changes maintained high code quality, introduced no breaking changes, and ensured that the codebase remained robust and maintainable for future development.