uhyo
Software Engineer
Tokyo, Japan
Summary
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Rockstaruhyo is a Tokyo-based software engineer with 14 years of experience and a strong focus on TypeScript. They contribute to high-profile open-source projects like Microsoft/TypeScript, where they've improved compiler diagnostics and fixed subtle edge cases around await/for-await-of and JSX typing. Comfortable working backend-close to language internals, they blend deep technical rigor with practical testing to improve developer experience. Fluent in TypeScript tooling, they bring a seasoned, detail-oriented approach to complex type-system and compiler problems while staying grounded in everyday engineering realities.
14 years of coding experience
Github Skills (9)
typescript10
javascript10
type-checking10
typescripts10
type-check10
typescript-types10
compiler-development10
language-design9
unit-testing8
Programming languages (12)
Github contributions (5)
microsoft/TypeScript
May 2019 - Jun 2022
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:5 reviews, 13 commits, 18 PRs in 3 years 2 months
Contributions summary:Uhyo primarily focused on enhancing the TypeScript compiler by addressing specific edge cases related to `await` and `for-await-of` expressions within non-async functions and constructors. They implemented error messages and related diagnostic information to improve developer experience when encountering these scenarios. Further contributions involved refining error messages related to JSX component return types and correcting potential issues in the type system. Additionally, they added test cases to validate the implemented changes.
typecheckerjavascriptcleantype-checksuperset
uhyo/masao-js
Sep 2015 - Mar 2019
Contributions:65 commits, 21 pushes, 1 branch in 3 years 6 months
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