【flowtype/React/Class】これ。how to fix 「Covariant property `[fn]` incompatible with contravariant use in “` assignment of property `[fn]`」

1996 × 478 【flowtype/React/Class】これ。how to fix 「Covariant property `[fn]` incompatible with contravariant use in “` assignment of property `[fn]`」
【flowtype/React/Class】これ。how to fix 「Covariant property `[fn]` incompatible with contravariant use in ``` assignment of property `[fn]`」

【flowtype/React/Class】これ。how to fix 「Covariant property `[fn]` incompatible with contravariant use in “` assignment of property `[fn]`」

【flowtype/React/Class】これ。how to fix 「Covariant property `[fn]` incompatible with contravariant use in ``` assignment of property `[fn]`」