JavaScript SyntaxError - Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead

Last Updated : 24 Aug, 2020

This JavaScript warning Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead occurs if there is a source map syntax defined in a JavaScript source, Which has been depreciated. 

Message:

Warning: SyntaxError: Using //@ to indicate sourceURL pragmas 
                      is deprecated. Use //# instead
Warning: SyntaxError: Using //@ to indicate sourceMappingURL 
                      pragmas is deprecated. Use //# instead

Error Type:

This is a warning that a SyntaxError has occurred. 
JavaScript execution won't be halted.

Cause of Error: Somewhere in the code, there is a source map syntax used in a JavaScript source, Which is depreciated.

Example 1: In this example, the sourceURL is used with @, Which is depreciated.

HTML 
<script>
    //@ sourceURL=http://abcd.com/path/name.map
</script>

Output:

Warning: SyntaxError: Using //@ to indicate sourceURL 
         pragmas is deprecated. Use //# instead

Example 2: In this example, the sourceMappingURL is used with @, Which is depreciated.

HTML 
<script>
    //@ sourceMappingURL=http://abcd.com/path/name.map
</script>

Output:

arning: SyntaxError: Using //@ to indicate sourceMappingURL
                     pragmas is deprecated. Use //# instead
Reference link: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Errors/Deprecated_source_map_pragma
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