Check the OS version

haptic.lucent.ts

import { PLATFORM } from "lucent:platform";
import {
  UIImpactFeedbackGenerator,
  UIImpactFeedbackGenerator_FeedbackStyle as Style,
} from "lucent:ios/UIKit";
import { Vibrator, VibratorManager } from "lucent:android/android.os";
import { appContext, available } from "lucent:android";
import { available as availableOnIOS } from "lucent:ios";
import { main } from "lucent:thread";

export async function tap(): Promise<void> {
  if (PLATFORM === "ios") {
    await main(() => {
      const style = availableOnIOS("ios", 13) ? Style.soft : Style.light;
      new UIImpactFeedbackGenerator(style).impactOccurred();
    });
  } else {
    const context = appContext();
    const vibrator = available("android", 31)
      ? context.getSystemService(VibratorManager)?.defaultVibrator
      : context.getSystemService(Vibrator);
    vibrator?.vibrate(20n);
  }
}

• available("android", api) from lucent:android is Build.VERSION.SDK_INT >= api. available("ios", major, minor?) from lucent:ios is Swift's #available.
• On Android, a class or member newer than API 24 compiles only behind such a check (LUCENT3007). Build_VERSION.SDK_INT >= 31 works too, and so does an early return on the opposite check.
• On iOS, the compiler doesn't check versions yet: guard new APIs yourself. Each SDK member's doc comment says the version it needs.
• vibrate(20n) passes a bigint: the milliseconds are a Java long, and every native 64-bit integer is a bigint in Lucent.