src/vs/platform/theme/common/tokenClassificationRegistry.ts/toJSONObject
	export function toJSONObject(style: TokenStyle): any {
		return {
			_foreground: style.foreground === undefined ? null : Color.Format.CSS.formatHexA(style.foreground, true),
			_bold: style.bold === undefined ? null : style.bold,
			_underline: style.underline === undefined ? null : style.underline,
			_italic: style.italic === undefined ? null : style.italic,
		};
	}