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    4.2.5 • Public • Published

    Broccoli concatenator that generates & propagates sourcemaps

    Build Status Build status

    This filter is designed to be fast & good enough. It can generates source maps substantially faster than you'll get via mozilla/source-map, because it's special-cased for straight line-to-line contenation.

    It discovers input sourcemaps in relative URLs, including data URIs.


    const node = concat(node);

    Advanced Usage

    const node = concat(node, {
      outputFile: '/output.js',
      header: ";(function() {",
      headerFiles: ['loader.js'],
      inputFiles: ['**/*'],
      footerFiles: ['auto-start.js'],
      footer: "}());",
      sourceMapConfig: { enabled: true },
      allowNone: false | true // defaults to false, and will error if trying to concat but no files are found.

    The structure of output.js will be as follows:

    // - header
    // - ordered content of the files in headerFiles
    // - un-ordered content of files matched by inputFiles, but not in headerFiles or footerFiles
    // - ordered content of the files in footerFiles
    // - footer

    Debug Usage

    note: this is intended for debugging purposes only, and will most likely negatively affect your build performace is left enabled

    Setting the environment variable CONCAT_STATS=true will result a summary of each concatention being output to process.cwd() + 'concat-stats-for/*.json'

    Each file within that directory represents a different contenation, and will contain:

    • outputFile – the output file that was created
    • sizes – a summary of each input file, and the associated pre-minified pre-gziped byte size.

    Want more details? like uglified or compressed sizes? (or have more ideas) go checkout: https://github.com/stefanpenner/broccoli-concat-analyser



      "outputFile": "path/to/output/File",
      "sizes": {
        "a.js": 5,
        "b.js": 10,

    other files:

    • concat-stats-for/-file/a.js
    • concat-stats-for/-file/b.js


    npm i broccoli-concat

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