src/vs/workbench/services/keybinding/electron-sandbox/nativeKeyboardLayout.ts/isUSStandard
function isUSStandard(_kbInfo: IKeyboardLayoutInfo | null): boolean {
	if (OS === OperatingSystem.Linux) {
		const kbInfo = <ILinuxKeyboardLayoutInfo>_kbInfo;
		return (kbInfo && (kbInfo.layout === 'us' || /^us,/.test(kbInfo.layout)));
	}

	if (OS === OperatingSystem.Macintosh) {
		const kbInfo = <IMacKeyboardLayoutInfo>_kbInfo;
		return (kbInfo && kbInfo.id === 'com.apple.keylayout.US');
	}

	if (OS === OperatingSystem.Windows) {
		const kbInfo = <IWindowsKeyboardLayoutInfo>_kbInfo;
		return (kbInfo && kbInfo.name === '00000409');
	}

	return false;
}