SolidJS•2mo ago

CreateEffect and store properties

I have a store with a property xyz that is of type undefined | { a: number, b: number} and I ran into something I don't quite understand with createEffect. I pass store.xyz to a component as a prop and on changing the value, this triggers:

createEffect(() => {
  console.log(props.xyz)
})
// > Proxy {a: 11, b: 2, Symbol(solid-proxy): Proxy, Symbol(store-node): Object}

createEffect(() => {
  console.log(props.xyz)
})
// > Proxy {a: 11, b: 2, Symbol(solid-proxy): Proxy, Symbol(store-node): Object}

while this does not:

createEffect(() => {
  console.log(props.xyz === undefined)
  console.log("xyz")
})
// No output on change

createEffect(() => {
  console.log(props.xyz === undefined)
  console.log("xyz")
})
// No output on change

Is there an explanation for this behavior? I'm running 1.7.11 if that helps.

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CreateEffect and store properties