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DefineMap set new prop undefined #408

Mattchewone opened this Issue Nov 16, 2018 · 1 comment


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Mattchewone commented Nov 16, 2018

Expected: setting a new prop should fire add even if new prop is undefined

import { DefineMap, Reflect } from "//";

const obj = new DefineMap({});
Reflect.onPatches(obj, handler);
obj.set("foo", undefined);  
obj.set("foo", "baz");  

Calling obj.set("foo", undefined); for the first time should log the following:

[{ type: "add", key: "foo", value: undefined }]

The type should be add since the property was not defined and is now defined albeit undefined


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cherifGsoul commented Dec 11, 2018

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