isError
isError :: a → Boolean
import isError from 'deep-waters/isError';
const err = new Error('foo');
isError(err); // → true
isError(anythingElse); // → false
import isString from 'deep-waters/isString';
import matchesPattern from 'deep-waters/matchesPattern';
const isEmail = compose(
isString,
matchesPattern(/^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/),
);
isError is built on top of ofClass validator and rely on
Object.prototype.toString
to check on the received value type in order to avoid typeof weird behaviours and encouraging a runtime strict type validation.Last modified 3yr ago