How to use the cspell-lib.Text function in cspell-lib

language: cfg.local || undefined,
        });

        const { filename, text } = fileInfo;
        const info = calcFinalConfigInfo(configInfo, settingsFromCommandLine, filename, text);
        const config = info.configInfo.config;
        const source = info.configInfo.source;
        cfg.debug(`Filename: ${filename}, Extension: ${path.extname(filename)}, LanguageIds: ${info.languageIds.toString()}`);

        if (!info.configInfo.config.enabled) return 0;

        const debugCfg = { config: {...config, source: null}, source };
        cfg.debug(commentJson.stringify(debugCfg, undefined, 2));
        const startTime = Date.now();
        const wordOffsets = await cspell.validateText(text, info.configInfo.config);
        const issues = cspell.Text.calculateTextDocumentOffsets(filename, text, wordOffsets);
        const elapsed = (Date.now() - startTime) / 1000.0;
        const dictionaries = config.dictionaries || [];
        cfg.info(
            `Checking: ${filename}, File type: ${config.languageId}, Language: ${config.language} ... Issues: ${issues.length} ${elapsed}S`,
            MessageTypes.Info
        );
        cfg.info(`Dictionaries Used: ${dictionaries.join(', ')}`, MessageTypes.Info);
        issues
            .filter(cfg.uniqueFilter)
            .forEach((issue) => cfg.logIssue(issue));
        return issues.length;
    }