chore(vendor): import pi 0.85.1

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/tui/src/native-modifiers.ts

@@ -0,0 +1,59 @@
+import { createRequire } from "node:module";
+import * as path from "node:path";
+import { getNativeModuleCandidates } from "./native-module-path.ts";
+
+const cjsRequire = createRequire(import.meta.url);
+
+export type ModifierKey = "shift" | "command" | "control" | "option";
+
+type NativeModifiersHelper = {
+	isModifierPressed: (name: ModifierKey) => boolean;
+};
+
+let nativeModifiersHelper: NativeModifiersHelper | null | undefined;
+
+function isNativeModifiersHelper(value: unknown): value is NativeModifiersHelper {
+	if (typeof value !== "object" || value === null) return false;
+	const candidate = (value as { isModifierPressed?: unknown }).isModifierPressed;
+	return typeof candidate === "function";
+}
+
+function loadNativeModifiersHelper(): NativeModifiersHelper | undefined {
+	if (nativeModifiersHelper !== undefined) return nativeModifiersHelper ?? undefined;
+	nativeModifiersHelper = null;
+	const arch = process.arch;
+	if (arch !== "x64" && arch !== "arm64") return undefined;
+
+	let nativePath: string;
+	if (process.platform === "darwin") {
+		nativePath = path.join("native", "darwin", "prebuilds", `darwin-${arch}`, "darwin-modifiers.node");
+	} else if (process.platform === "win32") {
+		nativePath = path.join("native", "win32", "prebuilds", `win32-${arch}`, "win32-console-mode.node");
+	} else {
+		return undefined;
+	}
+
+	for (const modulePath of getNativeModuleCandidates(nativePath)) {
+		try {
+			const helper = cjsRequire(modulePath) as unknown;
+			if (isNativeModifiersHelper(helper)) {
+				nativeModifiersHelper = helper;
+				return helper;
+			}
+		} catch {
+			// Try the next possible packaging location.
+		}
+	}
+
+	return undefined;
+}
+
+export function isNativeModifierPressed(key: ModifierKey): boolean {
+	const helper = loadNativeModifiersHelper();
+	if (!helper) return false;
+	try {
+		return helper.isModifierPressed(key) === true;
+	} catch {
+		return false;
+	}
+}