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import { invariant } from '@react-dnd/invariant';
export function validateSourceContract(source) {
    invariant(typeof source.canDrag === 'function', 'Expected canDrag to be a function.');
    invariant(typeof source.beginDrag === 'function', 'Expected beginDrag to be a function.');
    invariant(typeof source.endDrag === 'function', 'Expected endDrag to be a function.');
}
export function validateTargetContract(target) {
    invariant(typeof target.canDrop === 'function', 'Expected canDrop to be a function.');
    invariant(typeof target.hover === 'function', 'Expected hover to be a function.');
    invariant(typeof target.drop === 'function', 'Expected beginDrag to be a function.');
}
export function validateType(type, allowArray) {
    if (allowArray && Array.isArray(type)) {
        type.forEach(t => validateType(t, false));
        return;
    }
    invariant(typeof type === 'string' || typeof type === 'symbol', allowArray
        ? 'Type can only be a string, a symbol, or an array of either.'
        : 'Type can only be a string or a symbol.');
}