build-worker.js

let path = require('path');
let fs = require('fs');
let workerPath = './dist/worker.min.js';
let outputPath = '';

if (process.env.NODE_ENV == 'compress') {
    outputPath = './dist/inmap.min.js';
} else {
    outputPath = './dist/inmap.js';
}

let workerContent = fs.readFileSync(path.join(__dirname, workerPath), 'utf-8');

fs.readFile(path.join(__dirname, outputPath), 'utf-8', function (err, data) {
    if (err) {
        throw new Error('file not find');
    } else {

        workerContent = workerContent.replace(/"/g, '\\"').replace(/'/g, '\\\'');

        let repaleData = data.replace('[workerContentString]', workerContent);
        fs.writeFile(path.join(__dirname, outputPath), repaleData, function (err) {
            if (err) {
                throw new Error('write error');
            }
        });
    }

});
if (process.env.NODE_ENV !== 'compress') {
    fs.unlink(workerPath, (err) => {
        if (err) throw err;
    });
}