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64 lines
1.9 KiB
JavaScript
64 lines
1.9 KiB
JavaScript
'use strict';
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var convert = require('convert-source-map')
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, path = require('path')
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, fs = require('fs')
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, through = require('through2');
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function separate(src, file, root, url) {
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var inlined = convert.fromSource(src);
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if (!inlined) return null;
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var json = inlined
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.setProperty('sourceRoot', root || '')
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.toJSON(2);
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url = url || path.basename(file);
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var newSrc = convert.removeComments(src);
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var comment = '//# sourceMappingURL=' + url;
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return { json: json, src: newSrc + '\n' + comment }
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}
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var go = module.exports =
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/**
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* Transforms the incoming stream of code by removing the inlined source map and writing it to an external map file.
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* Additionally it adds a source map url that points to the extracted map file.
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*
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* #### Events (other than all stream events like `error`)
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*
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* - `missing-map` emitted if no map was found in the stream (the src still is piped through in this case, but no map file is written)
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*
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* @name exorcist
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* @function
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* @param {String} file full path to the map file to which to write the extracted source map
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* @param {String=} url allows overriding the url at which the map file is found (default: name of map file)
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* @param {String=} root allows adjusting the source maps `sourceRoot` field (default: '')
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* @return {TransformStream} transform stream into which to pipe the code containing the source map
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*/
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function exorcist(file, url, root) {
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var src = '';
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function ondata(d, _, cb) { src += d; cb(); }
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function onend(cb) {
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var self = this;
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var separated = separate(src, file, root, url);
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if (!separated) {
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self.emit(
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'missing-map'
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, 'The code that you piped into exorcist contains no source map!\n'
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+ 'Therefore it was piped through as is and no external map file generated.'
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);
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self.push(src);
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return cb();
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}
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self.push(separated.src);
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fs.writeFile(file, separated.json, 'utf8', cb)
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}
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return through(ondata, onend);
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}
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