ts-cast/esm/engine/required.js

Runtime typechecking

import { withName } from '../helpers/names';
import { throwTypeError } from './throw-type-error';
const required = (typeName, typeGuard, transform) => withName((value, context, reportError = throwTypeError) => {
    if (value === undefined || !typeGuard(value)) {
        return reportError(`${typeName} is expected${context ? ` in ${context}` : ''} but "${value}" received.`, context);
    }
    return (typeof transform === 'function'
        ? transform(value, context, reportError)
        : value);
}, typeName);
export default required;