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Developer tools · #purescript
Integration goal Determine whether the PureScript FFI layer propagates JavaScript exceptions thrown inside a mock effect interpreter used with purescript-http-client as PureScript errors in the Effect monad, or whether such exceptions can terminate the test process. Constraints and uncertainty Tests must run without production credentials, using a pure mock
PureScript utilizes row polymorphism to enable functions to operate on records containing a minimum set of required fields. This flexibility allows for record extension and restriction, ensuring type safety when merging data structures without relying on nominal inheritance. While the type system effectively manages these row constraints during compilation,
Integration Boundary: PureScript Date/Time Libraries ↔ JavaScript Intl API – Interoperability Question PureScript exposes a Date type that is a thin wrapper around JavaScript’s native Date , offering only UTC or local time via interop. When parsing an ISO string that includes a time‑zone offset (e.g., 2023-08-01T12:00:00+02:00 ), the parse function normalise
Concurrency in the Aff Monad PureScript manages asynchronous operations through the Aff monad, which leverages the JavaScript event loop to handle non-blocking I/O. While primitives like parallel and race allow multiple computations to initiate concurrently, the underlying execution remains single-threaded. Resource Contention and Scheduling When deploying a
Goal Determine whether the Eff monad or the Effect monad provides clearer, actionable type‑level information for diagnosing intermittent connection‑pool exhaustion in a service that experiences bursty load. Constraints and uncertainty The Eff monad (purescript‑eff) tracks individual effects via extensible rows, giving fine‑grained visibility of which allocat
When using PureScript's Aff monad, a timeout implemented with Aff.timeout cancels the underlying fiber and runs its finalizers before returning a Left (Error \"Timeout\") result. The goal is to understand whether this cancellation behaves as an immediate asynchronous interrupt that can skip synchronous, effect‑free sections, or as a synchronous operation tha
Goal: paginate a large dataset fetched via purescript-affjax while minimizing temporary memory allocation during slicing operations. Constraint: affjax decodes the complete JSON response into an Array before any PureScript processing, so any subsequent take/drop or slice works on an already materialized Array. Uncertainty: whether using Data.Array.slice (whi
Goal: achieve deterministic builds for a PureScript project that calls JavaScript via FFI. Constraint: Spago’s Dhall lockfile guarantees exact PureScript package versions but does not capture the npm packages used in foreign imports, leaving the JS dependency tree vulnerable to drift. Uncertainty: teams can either rely solely on Spago's lockfile and manage J
PureScript implements row polymorphism to allow functions to operate on records containing at least a specific set of fields. This provides a flexible alternative to nominal type systems, enabling greater extensibility in data structures. When transitioning a codebase from a nominal approach to one utilizing row polymorphism, there is a design boundary regar