Update dependency postcss-loader to v4 (!14594) · Merge requests · Warren Gifford / sourcegraph

minimum supported Node.js version is 10.13
minimum supported webpack version is 4
postcss was moved to peerDependencies, you need to install postcss
PostCSS (plugins/syntax/parser/stringifier) options was moved to the postcssOptions option, please look at docs
sourceMap default value depends on the compiler.devtool option
the inline value was removed for the sourceMap option, please use { map: { inline: true, annotation: false } } to achieve this
source maps contain absolute paths in sources
loader output only CSS, so you need to use css-loader/file-loader/raw-loader to inject code inside bundle
exec option was renamed to the execute option
the config option doesn't support Object type anymore, config.path and config.ctx options were removed
argument in the config for Function notation (previously config.ctx) was changed, now it contains { file, mode, webpackLoaderContext }
loader context in the config was renamed from webpack to webpackLoaderContext

message API for emit assets (#443) (e966ab9)
reuse AST from other loaders (#468) (9b75888)
allows to use config and loader options together, options from the loader takes precedence over the config, the plugins option from the config and options are merged (0eb5aaf)
postcssOptions options can be Function

you don't need ident option for loader
Object syntax for the plugin option is soft deprecated, please migrate on Array syntax (plugins: ['postcss-preset-env', ['cssnano', options]])

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Update dependency postcss-loader to v4