Transform full lodash imports into imports for separated modules

lodash_fixer.js

const glob = require('glob');
const fs = require('fs');

// Find file(s)
glob('*/**/*.+(js|jsx)', (err, files) => {
  if (err) { throw err; }

  console.log(`Found ${files.length} files to check...`); 
  
  files.forEach(item => {
    // Read file
    const content = fs.readFileSync(item, 'utf8');
    let newContent = content;

    const requireRegex = /const\s*_\s*=\s*require\(['"]lodash['"]\);*\n/gi;
    const required = content.match(requireRegex);

    const oneLinerRegex = /import\s*\{[(\w),\s]+\}\s*from\s*['"]lodash['"];*\n/gi;
    const oneLiner = content.match(oneLinerRegex);
    const importAllRegex = /import\s*_\s*from\s*['"]lodash['"];*\n/gi;
    const allImported = content.match(importAllRegex);

    if (!allImported && !oneLiner && !required) return;

    if (oneLiner) {
      let main = oneLiner[0].replace(/import\s*\{/, '');
      main = main.replace(/\}\s*from\s*['"]lodash[/'"]\w*;*/, '');

      const matches = main.match(/\w+/gi);

      matches.forEach(match => {
        newContent = `import ${match} from 'lodash/${match}';\n${newContent}`;
      });

      newContent = newContent.replace(oneLinerRegex, '');
    }

    const underscoreMatches = content.match(/_\.\w+/gi);
    if ((allImported || required) && underscoreMatches && underscoreMatches.length) {
      const repeatedMatches = [];

      underscoreMatches.forEach(dirtyMatch => {
        const match = dirtyMatch.replace('_.', '');
        if (repeatedMatches.some(repeatedMatch => repeatedMatch === match)) return;

        repeatedMatches.push(match);

        newContent = `import ${match} from 'lodash/${match}';\n${newContent}`;
      });

      underscoreMatches.forEach(dirtyMatch => {
        const match = dirtyMatch.replace('_.', '');

        newContent = newContent.replace(dirtyMatch, match);
      });
    }

    newContent = newContent.replace(importAllRegex, '');
    newContent = newContent.replace(requireRegex, '');

    console.log(item + ' changed');

    fs.writeFile(item, newContent, 'utf8', writeFileError => console.error(writeFileError));
  });
});