How to use the @textlint/utils.normalizeTextlintPluginKey function in @textlint/utils

loadPlugin(pluginName: string) {
        const pkgPath = this.moduleResolver.resolvePluginPackageName(pluginName);
        debug("Loading rules from plugin: %s", pkgPath);
        const plugin = moduleInterop(require(pkgPath));
        const pluginNameWithoutPrefix = normalizeTextlintPluginKey(pluginName);
        // Notes: plugins not support "rules" and "rulesConfig"
        // https://github.com/textlint/textlint/issues/291
        if (plugin.hasOwnProperty("rules")) {
            throw new Error(`textlint plugins not support "rules" and "rulesConfig".
But ${pluginName} has these filed.
For more details, See https://github.com/textlint/textlint/issues/291`);
        }
        // register plugin.Processor
        if (!plugin.hasOwnProperty("Processor")) {
            throw new Error(`textlint plugin should have "Processor".
For more details. See https://github.com/textlint/textlint/blob/master/docs/plugin.md`);
        }
        const pluginEntry = [pluginNameWithoutPrefix, plugin];
        this.emit(TextLintModuleLoader.Event.plugin, pluginEntry);
    }