Static generator first try

static-gen.js

const fs = require('fs')
const path = require('path')

const DEV_MODE = true;

// utils
debug = (...messages) => DEV_MODE ? console.log(messages) : "";

const parser = {
    feed(filename, opts) {
        let file = fs.createReadStream(path.join(__dirname, filename.endsWith('.html') ? filename : filename + ".html"))
        file.setEncoding('utf8')

        let content = '';

        file.on('data', chunk => {
            content += chunk;
        })

        file.on('end', chunk => {
            debug(`Parsed ${content.length} bytes`)
            debug("--------------------")
            debug("Starting to parse")
            this.parse(content, opts)
        })
    },
    parse(content) {
        const GET_VARIABLE_NAME = /\{\{(\w+)\}\}/gi
        const CONVERT_VARIABLE = /(\{\{\w+\}\})/gi

        // Parse variables and turn them into objects
        debug("Found following variables")
        let matched;
        while(matched = GET_VARIABLE_NAME.exec(content)){
            // use RegExp constructor to dynamically construct 
            // a matching rule with opts.variableName to be replaced
            // and match globally

            debug(matched[0])

        }
    }
}

parser.feed("title", { title: "Static parser", name: "Lucas"})