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

function calcFinalConfigInfo(
    configInfo: ConfigInfo,
    settingsFromCommandLine: cspell.CSpellUserSettings,
    filename: string,
    text: string
): FileConfigInfo {
    const ext = path.extname(filename);
    const fileSettings = cspell.calcOverrideSettings(configInfo.config, path.resolve(filename));
    const settings = cspell.mergeSettings(cspell.getDefaultSettings(), cspell.getGlobalSettings(), fileSettings, settingsFromCommandLine);
    const languageIds = settings.languageId ? [settings.languageId] : cspell.getLanguagesForExt(ext);
    const config = cspell.constructSettingsForText(settings, text, languageIds);
    return {configInfo: {...configInfo, config}, filename, text, languageIds};
}

private async fetchUriSettings(uri: string): Promise {
        log('Start fetchUriSettings:', uri);
        const folder = await this.findMatchingFolder(uri);
        const folderSettings = await this.fetchSettingsForUri(folder.uri);
        const spellSettings = CSpell.mergeSettings(this.defaultSettings, this.importedSettings(), folderSettings.settings);
        const fileUri = Uri.parse(uri);
        const fileSettings = CSpell.calcOverrideSettings(spellSettings, fileUri.fsPath);
        log('Finish fetchUriSettings:', uri);
        return fileSettings;
    }