fade()

import { AbsoluteFill } from "remotion";

const Letter: React.FC<{
  children: React.ReactNode;
  color: string;
}> = ({ children, color }) => {
  return (
    <AbsoluteFill
      style={{
        backgroundColor: color,
        opacity: 0.9,
        justifyContent: "center",
        alignItems: "center",
        fontSize: 200,
        color: "white",
      }}
    >
      {children}
    </AbsoluteFill>
  );
};
// ---cut---
import { linearTiming, TransitionSeries } from "@remotion/transitions";
import { fade } from "@remotion/transitions/fade";

const BasicTransition = () => {
  return (
    <TransitionSeries>
      <TransitionSeries.Sequence durationInFrames={40}>
        <Letter color="#0b84f3">A</Letter>
      </TransitionSeries.Sequence>
      <TransitionSeries.Transition
        presentation={fade()}
        timing={linearTiming({ durationInFrames: 30 })}
      />
      <TransitionSeries.Sequence durationInFrames={60}>
        <Letter color="pink">B</Letter>
      </TransitionSeries.Sequence>
    </TransitionSeries>
  );
};