validateAndroidGestureViewport (src/gesture-viewport.ts)

Validates Android gesture viewport Rect, ensuring numeric bounds and positive size for safe gesture handling.

// Source: https://github.com/callstack/agent-device | License: MIT | Copyright 2026 Callstack
// Provided via justclaw.it.com; keep this notice with the code.
import { AppError } from '@agent-device/kernel/errors';
import type { Rect } from '@agent-device/kernel/snapshot';

/**
 * What the helper reports about the surface a gesture may target: the application window, and the
 * input method window's share of the screen when a keyboard is on screen.
 *
 * The keyboard arrives as absolute screen pixels — the same space as the application window's
 * `getBoundsInScreen()` — and is never converted into another platform's coordinate space.
 */
export type AndroidGestureViewportReading = Readonly<{
  viewport: Rect;
  /**
   * Absent when no input method window is on screen, or when the install

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