setupCurConfig () {
    const curConfig = { ...this.defaultConfig, ...this.curConfig } // Now safe to merge with priority for curConfig in the event any are already set

    // Now deal with extensions and other array config
    if (!curConfig.noDefaultExtensions) {
      curConfig.extensions = [...this.defaultExtensions]
    }
    // Export updated config
    this.curConfig = curConfig
  }
Sets up current config based on defaults.
@returns {void}