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Adds SourceMaps for assets.

new webpack.SourceMapDevToolPlugin(options)

• options.test / options.include / options.exclude (string|RegExp|Array): Used to determine which assets should be processed. Each one can be a RegExp (asset filename is matched), a string (asset filename need to start with this string) or an Array of those (any of them need to be matched). test defaults to .js files if omitted.
• options.filename (string): defines the output filename of the SourceMap. If no value is provided the SourceMap is inlined.
• options.append (string): is appended to the original asset. Usually the #sourceMappingURL comment. [url] is replaced with a URL to the SourceMap file. false disables the appending.
• options.moduleFilenameTemplate / options.fallbackModuleFilenameTemplate (string): see output.devtoolModuleFilenameTemplate.
• options.module (boolean): (defaults to true) When false loaders do not generate SourceMaps and the transformed code is used as source instead.
• options.columns (boolean): (defaults to true) When false column mappings in SourceMaps are ignored and a faster SourceMap implementation is used.
• options.lineToLine ({test: string|RegExp|Array, include: string|RegExp|Array, exclude: string|RegExp|Array} matched modules uses simple (faster) line to line source mappings.

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原文：https://webpack.js.org/plugins/source-map-dev-tool-plugin/