@fgv/ts-utils-jest/dist/matchers/toFailWith/predicate.js

Custom matchers for ts-utils result class

export const matcherName = 'toFailWith';
export function predicate(received, expected) {
    if (received.isFailure()) {
        if (expected === undefined) {
            return received.message === undefined;
        }
        else if (expected instanceof RegExp) {
            return received.message.match(expected) !== null;
        }
        else {
            return received.message === expected;
        }
    }
    return false;
}
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