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add existence check for ast.comments

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This commit is contained in:
Sebastian McKenzie 2015-05-10 20:00:38 +01:00
parent 4ceb1d6f5e
commit 8ea2ae924d
1 changed files with 9 additions and 7 deletions
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16
src/babel/generation/index.js
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@ -337,14 +337,16 @@ class CodeGenerator {
for (var comment of (comments: Array)) {
var skip = false;
// find the original comment in the ast and set it as displayed
for (var origComment of (this.ast.comments: Array)) {
if (origComment.start === comment.start) {
// comment has already been output
if (origComment._displayed) skip = true;
if (this.ast.comments) {
// find the original comment in the ast and set it as displayed
for (var origComment of (this.ast.comments: Array)) {
if (origComment.start === comment.start) {
// comment has already been output
if (origComment._displayed) skip = true;
origComment._displayed = true;
break;
origComment._displayed = true;
break;
}
}
}