Function normalizeViewport

packages/core/src/testing/renderer.ts:117–123

(viewport: TestViewport | undefined)

type ClipRect = Readonly<{ x: number; y: number; w: number; h: number }>;

function normalizeViewport(viewport: TestViewport | undefined): TestViewport {
  const cols = viewport?.cols ?? 80;
  const rows = viewport?.rows ?? 24;
  const safeCols = Number.isFinite(cols) ? Math.max(0, Math.trunc(cols)) : 0;
  const safeRows = Number.isFinite(rows) ? Math.max(0, Math.trunc(rows)) : 0;
  return Object.freeze({ cols: safeCols, rows: safeRows });
}

function normalizeTheme(theme: Theme | ThemeDefinition | undefined): Theme {
  if (theme === undefined) return coreDefaultTheme;