Convert Gulp 3 to Gulp 4 with a codemod

gulp-to-gulp4-codemod.js

// Use https://astexplorer.net/

export default function transformer(file, api) {
  const j = api.jscodeshift;
  const root = j(file.source);
  
  const gulpTaskCalls = root.find(j.CallExpression, {
    callee: {
      object: {
        name: 'gulp'
      },
      property: {
        name: 'task'
      }
    }
  });
  
  gulpTaskCalls.forEach(p => {    
    if(p.node.arguments[1].type == 'ArrayExpression') {
		const dependentTasks = p.node.arguments[1];
      
    	p.node.arguments[1] = j.callExpression(
          j.identifier('gulp.series'),
          dependentTasks.elements
        );
    }
  });

  return root.toSource({quote: 'single'});
}