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

0 0 1 minute read

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

Whether you’re preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, zambiatek Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we’ve already empowered, and we’re here to do the same for you. Don’t miss out – check it out now!