function unmergeSectionToConfigFiles()

in server/aws-lsp-identity/src/sharedConfig/unmergeConfigFiles.ts [41:84]
30 lines of code
12 McCabe index (conditional complexity)

function unmergeSectionToConfigFiles(
    sectionName: string,
    mergedSettings: IniSection,
    configFile: ParsedIniData,
    credentialsFile: ParsedIniData
): void {
    const configSection = (configFile[sectionName] ||= {})
    const credentialsSection = (credentialsFile[sectionName] ||= {})

    // Remove existing settings not on mergedSettings (i.e. deleted)
    removeDeletedEntries({ removeFrom: configSection, deletedFrom: mergedSettings })
    removeDeletedEntries({ removeFrom: credentialsSection, deletedFrom: mergedSettings })

    // Apply each setting to the correct file section, in some cases, both
    for (const [settingName, settingValue] of Object.entries(mergedSettings)) {
        const inConfig: boolean = configSection && Object.hasOwn(configSection, settingName)
        const inCredentials: boolean = credentialsSection && Object.hasOwn(credentialsSection, settingName)

        // BEST PRACTICE: Secrets should be stored in credentials only
        // https://docs.aws.amazon.com/sdkref/latest/guide/file-format.html#file-format-creds
        if (isSecretSetting(settingName)) {
            credentialsSection[settingName] = settingValue

            if (inConfig) {
                delete configSection[settingName]
            }
            continue
        }

        // Whether non-secret setting wasn't previously stored or just in config, prefer config
        if (!inCredentials) {
            configSection[settingName] = settingValue
            continue
        }

        // Otherwise set in credentials and only update in config if it exists
        credentialsSection[settingName] = settingValue
        inConfig && (configSection[settingName] = settingValue)
    }

    // Remove empty sections
    !Object.keys(configSection).length && delete configFile[sectionName]
    !Object.keys(credentialsSection).length && delete credentialsFile[sectionName]
}