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.
var node = concat(node);var 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
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