How to manipulate JavaScript code together with its sourcemap (in node.js)?

Question

We have some JavaScript that is output generated by a compiler that also created a source-map.

Now I'd like to do some simple work on this output JS like adding some lines or stripping some code. But it has to be done in a way that would also update the source-map so it stays valid for the changed code.

Is this possible?

the desired changes cannot be expressed with the original language or toolchain (which is why I want to post-process). — Bartvds
– Bartvds, Commented Mar 27, 2014 at 17:57
OK, I see. Still, even if not relevant for the question, I'm curious what compiler you are using and what parts of the output code you need to manipulate? — Bergi
– Bergi, Commented Mar 27, 2014 at 18:13
In my practical case I use TypeScript and want to do all kinds of creative stuff with the JS output. Like concatenating files, splicing substrings etc. — Bartvds
– Bartvds, Commented Mar 27, 2014 at 18:19
So you don't want to modify what the code does, but only move parts of it around? You might want to have a look at Generating source maps for multiple concatenated javascript files then. — Bergi
– Bergi, Commented Mar 27, 2014 at 19:24

Dimitri Kopriwa · Accepted Answer · 2014-10-30 19:08:51Z

0

You need to work on the source code, or you will have to generate a new sourcemap from the new one.

answered Oct 30, 2014 at 19:08

Dimitri Kopriwa

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