add extract-text-webpack-plugin helper package #4532
Merged
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Provides shared per-stage
extract-text-webpack-plugin
instances for all Gatsby plugins, including Gatsby core (implementation PR will follow). Gatsby styling plugins currently overwrite one another's output during the build whenever multipleextract-text-webpack-plugin
instances are added to the Webpack config (the Netlify CMS plugin does this). This happens because the plugins are importingextract-text-webpack-plugin
and instantiating a new instance direct from the constructor. The module added by this PR allows all plugins to use the same instance.In short, this enables a simpler and more reliable way to achieve the fix from #4495 for all plugins.
Related to #4516.
Note: the conventions in this PR are borrowed from
gatsby-1-config-css-modules
with the assumption that that package is a desirable pattern for Gatsby config helpers.