Migrating from Underscore to Lodash

This post details the migration of Dropbox's core web application from the Underscore.js utility library to Lodash. The migration strategy involved creating a Web Enhancement Proposal (WEP) for community alignment, researching necessary Lodash functions, and developing a custom, tree-shaken Lodash bundle using Webpack and lodash-webpack-plugin. Challenges in integrating with Bazel, handling TypeScript typings, and managing minification/source maps were addressed. The process also involved adapting the build to include necessary Lodash shorthands by using LodashModuleReplacementPlugin.