[system] Use ReadonlyArray
for CSS related types
#40972
Merged
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Root cause
The sx prop uses
csstype
which hasReadonlyArray
changes in3.1.3
whereasCSSObject
comes from emotionChanges
ReadonlyArray
for theResponsiveStyleValue
to work withCSSObject
Array
toReadonlyArray
in CSS type declarations emotion-js/emotion#3141Related to #40750