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We want to stop throwing Errors and instead returning Results from our methods in an effor to force us to handle errors explicitly and correctly. This is because we're working in a decentralised system where errors are abundant and expected, and we want to make them first class citizens of our application. The current state of the system of throwing errors is leading to a lot of 500 errors in production, most of which can and should be handled at the application level, rather than bubbling up. This implementation is very small and essentially boils down to 2 element tuples containing either null and the value, or an error and null. A few helper functions have been provided to make the DX a little better, with the idea being that we can either build this up, or replace it with a library once we have a better understanding of our use-cases and desired feature set.
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🧹 Nitpick comments (4)
src/core/result.ts (4)
1-3: Minimal and clear Result type definitions.The tuple-based
Ok,Error, andResulttypes are concise and easy to use. This approach is efficient and idiomatic for TypeScript, especially for enforcing explicit error handling.However, consider using a unique symbol or branding to prevent accidental misuse of tuples with the same shape elsewhere in the codebase. This is an optional enhancement for stronger type safety.
19-21: Accessor functions assume correct input types.Both
getValueandgetErrorassume the input is the correct tuple type. If misused (e.g., passing anErrortogetValue), this will result in undefined or incorrect values at runtime.Consider adding runtime checks or assertions to guard against incorrect usage, or document clearly that these functions are unsafe unless type-checked (e.g., via
isError).Also applies to: 23-25
1-44: Add unit tests for Result utilities.There are no tests in this file. To ensure correctness and prevent regressions, add unit tests for all exported functions, especially for edge cases (e.g., misuse of accessors, unsafeUnwrap with error, etc.).
Would you like help generating a test suite for these utilities?
1-44: Consider extending JSDoc comments for all functions.Some functions have JSDoc comments, but not all. For consistency and better developer experience, consider adding JSDoc comments to all exported functions.
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🔇 Additional comments (3)
src/core/result.ts (3)
15-17: Type predicate isError is well-implemented.The
isErrorfunction is a proper type predicate, enabling type narrowing in downstream code. The implementation is correct and efficient.
30-35: unsafeUnwrap is clear and matches expectations.The
unsafeUnwrapfunction throws on error and returns the value otherwise, which is the expected behavior for an "unsafe" unwrap. The implementation is correct and leverages the other utilities well.
37-39: Factory functions are correct and idiomatic.The
okanderrorfunctions are simple, correct, and make constructing results easy and explicit.Also applies to: 41-43
1 participant
We want to stop throwing Errors and instead returning Results from our methods in an effor to force us to handle errors explicitly and correctly. This is because we're working in a decentralised system where errors are abundant and expected, and we want to make them first class citizens of our application.
The current state of the system of throwing errors is leading to a lot of 500 errors in production, most of which can and should be handled at the application level, rather than bubbling up.
This implementation is very small and essentially boils down to 2 element tuples containing either null and the value, or an error and null.
A few helper functions have been provided to make the DX a little better, with the idea being that we can either build this up, or replace it with a library once we have a better understanding of our use-cases and desired feature set.