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fix: IE11 clone() #1029

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Oct 21, 2020
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7 changes: 6 additions & 1 deletion src/mixed.js
Original file line number Diff line number Diff line change
Expand Up @@ -98,8 +98,13 @@ const proto = (SchemaType.prototype = {

// if the nested value is a schema we can skip cloning, since
// they are already immutable
return cloneDeepWith(this, (value) => {
return cloneDeepWith(this, (value, key) => {
if (isSchema(value) && value !== this) return value;

// fix for ie11 when cloning Set and Map
if (key === '_whitelist' || key === '_blacklist') {
return value.clone();
}
});
},

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