Handline Inline Sourcemaps #522
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nicklozon
commented
Feb 21, 2024
| @@ -2,21 +2,25 @@ module Sprockets | |||
| module Rails | |||
| # Rewrites source mapping urls with the digested paths and protect against semicolon appending with a dummy comment line | |||
| class SourcemappingUrlProcessor | |||
| REGEX = /\/\/# sourceMappingURL=(.*\.map)/ | |||
| FILE_REGEX = /\/\/# sourceMappingURL=(.*\.map)/ | |||
| INLINE_REGEX = /\/\/# sourceMappingURL=(data:.*)$/ | |||
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Typically inline sourcemaps will look something like this: sourceMappingURL=data:application/json;base64,abc123= where abc123= is encoded data. The regex assumes anything starting with data: is an inline sourcemap, which I fell is a safe assumption from my experience.
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Description
Sprockets gem appends semicolons to each js asset which corrupts
//# sourceMappingURL=magic comments.sprockets-railsfixes this by appending\n//!\nto the asset so thesourceMappingURLis not the last line and in turn not corrupted by the semicolon. This only applies to external sourcemap files.This PR improves
SourcemappingUrlProcessorto also add\n//!\naftersourceMappingURLcomments when they contain inline sourcemaps.