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withValidation()

withValidation<S, Out>(schema, strategy): (input) => Result<Out, string>

Validates input against a kanon schema before executing the strategy. Bridges kanon validation, zygos Result, and the strategy pattern.

Type Parameters​

S: S extends GenericSchema​

The kanon schema type

Out: Out​

The output type of the strategy

Parameters​

schema: S​

Kanon schema to validate input against

strategy: Strategy<Infer<S>, Out>​

Strategy to execute on validated input

Returns​

A function accepting unknown input and returning Result<Out, string>

Since​

2.4.0

Example​

import { number } from "@pithos/core/kanon";

const double = withValidation(
  number().min(0),
  (n) => n * 2,
);

double(5);       // Ok(10)
double(-1);      // Err("Number must be >= 0")
double("hello"); // Err("Expected number")