function aResolvedKeybindingItem({ command, when, isDefault, firstPart, chordPart }: { command?: string, when?: string, isDefault?: boolean, firstPart?: { keyCode: KeyCode, modifiers?: Modifiers }, chordPart?: { keyCode: KeyCode, modifiers?: Modifiers } }): ResolvedKeybindingItem {
		const aSimpleKeybinding = function (part: { keyCode: KeyCode, modifiers?: Modifiers }): SimpleKeybinding {
			const { ctrlKey, shiftKey, altKey, metaKey } = part.modifiers || { ctrlKey: false, shiftKey: false, altKey: false, metaKey: false };
			return new SimpleKeybinding(ctrlKey, shiftKey, altKey, metaKey, part.keyCode);
		};
		const keybinding = firstPart ? chordPart ? new ChordKeybinding(aSimpleKeybinding(firstPart), aSimpleKeybinding(chordPart)) : aSimpleKeybinding(firstPart) : null;
		return new ResolvedKeybindingItem(keybinding ? new USLayoutResolvedKeybinding(keybinding, OS) : null, command || 'some command', null, when ? ContextKeyExpr.deserialize(when) : null, isDefault === void 0 ? true : isDefault);
	}

	public resolveKeyboardEvent(keyboardEvent: IKeyboardEvent): ResolvedKeybinding {
		let keybinding = new SimpleKeybinding(
			keyboardEvent.ctrlKey,
			keyboardEvent.shiftKey,
			keyboardEvent.altKey,
			keyboardEvent.metaKey,
			keyboardEvent.keyCode
		);
		return new USLayoutResolvedKeybinding(keybinding.toChord(), this._OS);
	}

	function aResolvedKeybindingItem({ command, when, isDefault, firstPart, chordPart }: { command?: string, when?: string, isDefault?: boolean, firstPart?: { keyCode: KeyCode, modifiers?: Modifiers }, chordPart?: { keyCode: KeyCode, modifiers?: Modifiers } }): ResolvedKeybindingItem {
		const aSimpleKeybinding = function (part: { keyCode: KeyCode, modifiers?: Modifiers }): SimpleKeybinding {
			const { ctrlKey, shiftKey, altKey, metaKey } = part.modifiers || { ctrlKey: false, shiftKey: false, altKey: false, metaKey: false };
			return new SimpleKeybinding(ctrlKey!, shiftKey!, altKey!, metaKey!, part.keyCode);
		};
		let parts: SimpleKeybinding[] = [];
		if (firstPart) {
			parts.push(aSimpleKeybinding(firstPart));
			if (chordPart) {
				parts.push(aSimpleKeybinding(chordPart));
			}
		}
		const keybinding = parts.length > 0 ? new USLayoutResolvedKeybinding(new ChordKeybinding(parts), OS) : undefined;
		return new ResolvedKeybindingItem(keybinding, command || 'some command', null, when ? ContextKeyExpr.deserialize(when) : undefined, isDefault === undefined ? true : isDefault);
	}

	protected _getUserSettingsLabel(keybinding: SimpleKeybinding): string | null {
		if (keybinding.isDuplicateModifierCase()) {
			return '';
		}
		const result = KeyCodeUtils.toUserSettingsUS(keybinding.keyCode);
		return (result ? result.toLowerCase() : result);
	}

	private _getAriaLabelForKeybinding(keybinding: SimpleKeybinding): string {
		if (!keybinding) {
			return null;
		}
		if (keybinding.isDuplicateModifierCase()) {
			return '';
		}
		return KeyCodeUtils.toString(keybinding.keyCode);
	}

	private _getUILabelForKeybinding(keybinding: SimpleKeybinding): string {
		if (!keybinding) {
			return null;
		}
		if (keybinding.isDuplicateModifierCase()) {
			return '';
		}
		return this._keyCodeToUILabel(keybinding.keyCode);
	}

	private _getUserSettingsLabelForKeybinding(keybinding: SimpleKeybinding): string {
		if (!keybinding) {
			return null;
		}
		if (keybinding.isDuplicateModifierCase()) {
			return '';
		}
		return USER_SETTINGS.fromKeyCode(keybinding.keyCode);
	}

	private _getElectronAcceleratorLabelForKeybinding(keybinding: SimpleKeybinding): string {
		if (!keybinding) {
			return null;
		}
		if (keybinding.isDuplicateModifierCase()) {
			return null;
		}
		return this._keyCodeToElectronAccelerator(keybinding.keyCode);
	}

	private _getUserSettingsLabelForKeybinding(keybinding: SimpleKeybinding | null): string | null {
		if (!keybinding) {
			return null;
		}
		if (keybinding.isDuplicateModifierCase()) {
			return '';
		}
		return KeyCodeUtils.toUserSettingsUS(keybinding.keyCode);
	}

	public static getDispatchStr(keybinding: SimpleKeybinding): string {
		if (keybinding.isModifierKey()) {
			return null;
		}
		let result = '';

		if (keybinding.ctrlKey) {
			result += 'ctrl+';
		}
		if (keybinding.shiftKey) {
			result += 'shift+';
		}
		if (keybinding.altKey) {
			result += 'alt+';
		}
		if (keybinding.metaKey) {
			result += 'meta+';
		}
		result += KeyCodeUtils.toString(keybinding.keyCode);

		return result;
	}