bin/webpack-dev-server can fail with Yarn's "Command "webpack-dev-server" not found" error when dependencies are missing; yarn install --check-files restores the command.

Version 1 CoffeeScript projects need legacy documentation and examples that match ES5 output; current docs and the Try CoffeeScript console target the newer language version.

Manual activation for WProofreader can be needed when autoSearch misses a CKEditor 4 instance; initializing it on the editor iframe enables spell and grammar checking.

Enforcing peer review on even small changes improves code health in multi-developer projects and makes PRs and CRs easier to manage.

Complex regex patterns are hard to debug by inspection; visual editors highlight matches and capture groups to make validation easier.

Design tools, UI inspiration, and asset libraries help developers build polished interfaces faster without starting from scratch.

Integrating makandra-rubocop into an existing Ruby codebase often means handling many current offenses, then fixing cops incrementally without blocking development.

Quickly gauge which database tables are growing unnoticed by checking approximate row counts in PostgreSQL or MySQL.

Call view helpers from the Rails console via helper or an ActionView::Base instance when a helper depends on templates.

Set a consistent browser viewport for Selenium tests to avoid layout-dependent failures and mobile-versus-desktop behavior differences.

Rails console fails after upgrading Ruby because spring tries to load a missing irb file. Updating binding_of_caller to 0.8.0 restores console startup.

Chromedriver logging helps diagnose Selenium Chrome test failures by recording driver activity to a file or terminal. Service configuration or a manually started driver can enable verbose output.

isolator raises errors for non-rollbackable side effects inside DB transactions, such as HTTP calls, queued jobs, and emails.

AngularJS directive lifecycle hooks control template mutation and link-time behavior before and after child directives run, enabling DOM customization and coordinated initialization.

Convert .scss files to indented Sass syntax from the command line with sass-convert, including whole directories.

Generates a complete favicon set for browsers, mobile home screens, and Touch Bar use from a square SVG or image.

Whitespace can disappear in Haml-rendered pages in staging or production, causing inline elements like buttons to stick together. A helper can make intended spacing explicit.

Legacy data can be imported into a new Rails app by connecting a second database and mapping old tables and columns with Active Record models.

Combine multiple PDF files from the Linux command line with pdftk or pdfjam; convert works too, but often lowers quality and increases file size.

IE11 drops calc() inside the flex shorthand, breaking layouts that need percentage widths with gutters. Using flex-basis separately preserves the intended size.

CoffeeScript class methods use @ on the class definition and can be called from instances through @constructor or the class itself.

Upgrading Clearance can break existing logins when password hashes change from SHA1 to BCrypt, causing BCrypt::Errors::InvalidHash for legacy users.