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569 B

2 years ago
'use strict';
exports.__esModule = true;
exports.default = function visit(node, keys, visitorSpec) {
if (!node || !keys) {
return;
}
const type = node.type;
if (typeof visitorSpec[type] === 'function') {
visitorSpec[type](node);
}
const childFields = keys[type];
if (!childFields) {
return;
}
childFields.forEach((fieldName) => {
[].concat(node[fieldName]).forEach((item) => {
visit(item, keys, visitorSpec);
});
});
if (typeof visitorSpec[`${type}:Exit`] === 'function') {
visitorSpec[`${type}:Exit`](node);
}
};