Remove top-level `"use strict";`. It can cause problems with bundlers that concatenate scripts, and so is not a recommended practice.

remove-top-use-strict.js

module.exports = function transformer(file, api) {
  const j = api.jscodeshift;

  return j(file.source)
    .find(j.ExpressionStatement).filter(path => (
      path.parentPath.node.type === "Program" &&
      path.value.expression.type === 'Literal' &&
      path.value.expression.value === 'use strict'
    ))
    .forEach(path => j(path).remove())
    .toSource();
};