Webpack OnBuild Plugin

The `on-build-webpack` package provides a Webpack plugin designed to execute a callback function immediately after a build completes. Published as version `0.1.0` in October 2014, this package is considered abandoned and is not actively maintained. Its functionality is extremely basic, offering a single post-build hook, which contrasts sharply with the extensive `compiler.hooks` API introduced in modern Webpack versions (v4+). This plugin uses an outdated Webpack API (`compiler.plugin('done', ...)`) that has been replaced by the Tapable hook system (`compiler.hooks.done.tap(...)`). Consequently, it is incompatible with Webpack v4 and newer. Current best practice is to use Webpack's native plugin system directly via `compiler.hooks.done.tap` within a custom plugin.