ts-cast/esm/engine/validate.js

Runtime typechecking

import { withName } from '../helpers/names';
const isNonEmpty = (value) => value.length > 0;
const success = (result) => ({ ok: true, result, errors: [] });
const failure = (errors) => ({ ok: false, result: undefined, errors });
export const validate = (casterFn) => (value, context) => {
    const errors = [];
    const reportError = (message, ctx) => {
        errors.push({ message, context: ctx });
    };
    try {
        const result = casterFn(value, context, reportError);
        return isNonEmpty(errors) ? failure(errors) : success(result);
    }
    catch (err) {
        return failure([{ message: err.message, context }]);
    }
};
export const validation = (casterFn, invalidFactory, validFactory) => {
    const validator = validate(casterFn);
    return withName((value, context) => {
        const vResult = validator(value, context);
        return vResult.ok ? validFactory(vResult.result) : invalidFactory(vResult.errors);
    }, `validation<*, ${casterFn}>`);
};