v10.3.0

Added

• Allowed webpack-dev-server v6. PR #1102 by G-Rath.

Fixed

• Fixed implicit SWC defaults for existing webpack/Babel apps without swc-loader. PR #1206 by justin808. Webpack apps that omit both javascript_transpiler and the deprecated webpack_loader now fall back to Babel with a warning when Shakapacker's bundled SWC default is active, swc-loader is missing, and Babel is present. Explicit transpiler settings, webpack apps with swc-loader, and Rspack's built-in SWC path keep their existing behavior. Closes #1203.
• Fixed JavaScript config loading for missing Rails environments to use the production fallback. PR #1206 by justin808. When RAILS_ENV has no matching section in config/shakapacker.yml, the Node package config now merges the production section instead of only bundled defaults, matching Ruby configuration loading and honoring explicit production javascript_transpiler, source_path, dev_server, and related settings for custom environments such as staging.
• Fixed helper binstubs delegating Node resolution to Ruby exec in unset and empty PATH environments. PR #1200 and PR #1201 by justin808. Restores shell-compatible Node lookup for bin/shakapacker-config and bin/diff-bundler-config after the v10.2.0 Ruby-binstub regression, while keeping friendly missing-Node errors for ENOENT and EACCES.