njseries_03_05.js

class Templater {
    ...
    constructor(dir, cached){
        this._dir = path.resolve(dir)
        this._cached = cached || false
        this._compiledDir = path.join(this._dir, '.tmp')
        // create compiled directory if not exist
        if(!fs.existsSync(this._dir)){
            throw Error('Template directory does not exist')
        }
        if (!fs.existsSync(this._compiledDir)) {
            fs.mkdirSync(this._compiledDir)
        }
    }
    ...
}