Removed sn undefined warning (#572)
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@@ -39,7 +39,7 @@ export function createMirror(): Mirror {
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map: {},
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getId(n) {
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// if n is not a serialized INode, use -1 as its id.
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if (!n.__sn) {
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if (!n || !n.__sn) {
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return -1;
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}
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return n.__sn.id;
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