src/vs/editor/common/tokens/lineTokens.ts/LineTokens/createEmpty
class LineTokens:	public static createEmpty(lineContent: string, decoder: ILanguageIdCodec): LineTokens {
		const defaultMetadata = LineTokens.defaultTokenMetadata;

		const tokens = new Uint32Array(2);
		tokens[0] = lineContent.length;
		tokens[1] = defaultMetadata;

		return new LineTokens(tokens, lineContent, decoder);
	}