Roan Kattouw <roan.kattouw <at> gmail.com> writes:
Actually, the line number would not mean a great deal because the scripts would still be combined, comments frequently take up entire lines and the deminifier cannot account for blank lines, statements broken over multiple lines, or multiple statements on one line. All this means it's impossible to map the line number to a source line and file, although I agree it does map it to a statement: someone else can add a breakpoint at the same line of the same combined+minified output (provided they're also hitting the same load.php URL) and have that break at the exact statement the reporter got their error on.
It shouldn't be too hard to have the minification script create a line number translation table; just delay stripping newlines until the end, and create an index of newline positions in the original and minified versions of the code. (You would need error offsets for that to be useful, though; I don't know which browsers provide that.)