undefined not supported

[Hypnosphi]

See storybookjs/storybook#4487 (comment)

parse(stringify({foo: undefined}))
> {}

[christophehurpeau]

This is the spec of JSON.parse that removes undefined values, I can't see how we could fix this ?

[christophehurpeau]

https://www.ecma-international.org/ecma-262/5.1/#sec-15.12.2

If it returns undefined then the property is deleted from the result.

[Hypnosphi]

I can't see how we could fix this

Iterate over keys instead of using JSON.parse?

[christophehurpeau]

Note that undefined is only not "supported" when it's a value in an object.
For example, the following works:

telejson.parse(telejson.stringify([undefined]))