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Title: Improve type inference of `Result` by henrymercer · Pull Request #3506 · github/codeql-action · GitHub

Open Graph Title: Improve type inference of `Result` by henrymercer · Pull Request #3506 · github/codeql-action

X Title: Improve type inference of `Result` by henrymercer · Pull Request #3506 · github/codeql-action

Description: Thanks @mbg for pointing out this drawback. By defining Result as a sum type Success | Failure, we can now infer that a Result is a failure if it is not a success. For example, if we have: const a = new Success(2) as Result; if (a.isSuccess()) { logger.info(`Success with value ${a.value}`); } else { logger.info(`Failure with error ${a.value}`); } we can now infer in the else branch that a.value must be a string.

Open Graph Description: Thanks @mbg for pointing out this drawback. By defining Result<T, E> as a sum type Success<T> | Failure<E>, we can now infer that a Result is a failure if it is not a success. Fo...

X Description: Thanks @mbg for pointing out this drawback. By defining Result&lt;T, E&gt; as a sum type Success&lt;T&gt; | Failure&lt;E&gt;, we can now infer that a Result is a failure if ...

Opengraph URL: https://github.com/github/codeql-action/pull/3506

X: @github

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Domain: github.com

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160d27b Improve type inference of `Result` henrymercer Feb 24, 2026 https://github.com/github/codeql-action/pull/3506/commits/160d27baf00e1b1f48bd189d637609258cad98c8
e51b6a9 Update names in tests henrymercer Feb 24, 2026 https://github.com/github/codeql-action/pull/3506/commits/e51b6a9a520cc75c12cc3a2eaef8363f6845b5be
2a607fe Update JSDoc henrymercer Feb 24, 2026 https://github.com/github/codeql-action/pull/3506/commits/2a607fea25af475c1da15fbb12d33701cdf05d16
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