function isShadowed(scope, node) {
    const reference = findReference(scope, node)

    return reference && reference.resolved && reference.resolved.defs.length > 0
}
Checks if the given identifier node is shadowed in the given scope.
@param {Object} scope The current scope.
@param {ASTNode} node The identifier node to check.
@returns {boolean} Whether or not the name is shadowed.