GT2/Ejectable/node_modules/babel-preset-fbjs/plugins/test-utils/validateOutputAst.js

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2021-08-16 00:14:59 +00:00
/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
'use strict';
const t = require('@babel/types');
module.exports = function validateOutputAst(ast) {
const seenNodes = new Set();
t.traverseFast(ast, function enter(node) {
if (seenNodes.has(node)) {
throw new Error('Found a duplicate node in the output, which can cause'
+ ' undefined behavior in Babel.');
}
seenNodes.add(node);
})
}