/webpack-obfuscator-sourcemap-bug

Primary LanguageJavaScript

Issue: webpack-obfuscator plugin is not generating sourcemaps

The plugin is not generating sourcemaps with the config provided in webpack.original.js and webpack.common.js.

I've managed to trace the issue, and it seems like with the compilation stage that the Plugin is currently using does not provide sourcemaps for input assets.

Snippet from webpack-obfuscator/plugin/index.ts:

    private extractSourceAndSourceMap(asset: any): { inputSource: string, inputSourceMap: RawSourceMap } {
        if (asset.sourceAndMap) {
            const { source, map } = asset.sourceAndMap();
            return { inputSource: source, inputSourceMap: map };
        } else {
            return {
                inputSource: asset.source(),
                inputSourceMap: asset.map()
            }
        }
    }

With the current compilation stage of PROCESS_ASSETS_STAGE_SUMMARIZE, the return value of inputSourceMap is always null. This means that the plugin never merges the sourcemaps generated during obfuscation with the input sourcemaps.

If the compilation stage is changed to PROCESS_ASSETS_STAGE_DEV_TOOLING, then inputSourceMaps is defined, sourcemaps are merged as expected and correct (usable) .map files are written to the output directory.

This is what I've done in the forked LavaTile/webpack-obfuscator repository (used in webpack.patched.js)

Outputs of both original and patched version of the library can be found in dist/ and validated using https://sokra.github.io/source-map-visualization/#custom