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The usage of `//@` in sourceMappingURL pragmas was deprecated in favor of `//#`. The deprecation happened in 2013, and was motivated by incompatibilities in IE. The Chromium and Mozilla issues tracking the change: https://bugs.chromium.org/p/chromium/issues/detail?id=239660 https://bugzilla.mozilla.org/show_bug.cgi?id=870361 And the Mozilla documentation on the warning that is issued as a result of using the deprecated syntax: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma?utm_source=mozilla&utm_medium=firefox-console-errors&utm_campaign=default