Walks all js files in the source directory and finds strings using acorn.

acornTest.js

var acorn = require('acorn-jsx');
let fs = require('fs');
function getAllStrings(fileName) {
  let file = fs.readFileSync(fileName);

  const options = {
    sourceType: 'module',
    ecmaVersion: 9,
    plugins: {
      jsx: { allowNamespacedObjects: true },
    },
  };
  let tokens = [...acorn.tokenizer(file, options)];

  return tokens.filter(t => t.type.label === 'string').map(t => t.value);
}

module.exports = { getAllStrings };

walkAllFiles.js

var walk = require('walk');
let { getAllStrings } = require('./acornTest.js');
var files = [];

var walker = walk.walk('./src', { followLinks: false });

walker.on('file', function(root, stat, next) {
  files.push(root + '/' + stat.name);
  next();
});

let strings = [];
walker.on('end', function() {
  let jsFiles = files.filter(f => f.endsWith('.js'));

  for (let index = 0; index < jsFiles.length; index++) {
    try {
      const file = jsFiles[index];
      strings = strings.concat(getAllStrings(file));
    } catch (error) {
      console.log(error);
    }
  }
});