Ok, I get the split in x and y 👍, but can't we keep| @as("left") Left instead of| @as("0%") Left?

No because I found that those keywords aren't handled in the array syntax :(
(that's why I split the change in 2 different commits)

I'll open an issue on thereact-native repo, but, since theprocessTransformOrigin function transform those keywords to0%,50% and100% for the string syntax. I think it's ok to be handled this way, instead of removing the keywords.