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add existence check for child and parent when inheriting comments

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This commit is contained in:
Sebastian McKenzie 2015-03-28 04:00:02 +11:00
parent 06a58f228c
commit de42a6f796
1 changed files with 5 additions and 3 deletions
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8
src/babel/types/index.js
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@ -267,9 +267,11 @@ export function removeComments(child: Object): Object {
*/
export function inheritsComments(child: Object, parent: Object): Object {
each(COMMENT_KEYS, function (key) {
child[key] = uniq(compact([].concat(child[key], parent[key])));
});
if (child && parent) {
each(COMMENT_KEYS, function (key) {
child[key] = uniq(compact([].concat(child[key], parent[key])));
});
}
return child;
}