The basic demo doesn't work.

I’m following the basic demo here: https://github.com/evanw/node-source-map-support#basic-demo

npm install source-map-support

echo 'throw new Error("test"); // This is the original code' > original.js

echo 'require("source-map-support").install();

throw new Error("test"); // This is the compiled code
// The next line defines the sourceMapping.
//# sourceMappingURL=compiled.js.map' > compiled.js

echo '{
  "version": 3,
  "file": "compiled.js",
  "sources": ["original.js"],
  "names": [],
  "mappings": ";;;AAAA,MAAM,IAAI"
}' > compiled.js.map

node compiled.js

And I get:

.../compiled.js:3
throw new Error(test); // This is the compiled code
      ^
Error: test

[jeremytm]

Thanks team. I’ve got things working.

Part of the reason I thought this was broken and tried the demo is because I couldn’t get it to work in my own project.

The problem turned out to be this line from your README:

Once you have a valid source map, insert the following line at the top of your compiled code:

require('source-map-support').install();

I was inserting this line at the top of an already compiled file (as the instructions said) and then expecting it to work. But my sourcemaps are generated by babel at the same time as compilation, so with an extra line added after the sourcemap had been generated, things got messed up.

The fix ended up being to insert this line in the original file before compilation, and then everything worked.

I’m happy to submit a PR request for the README, but could someone confirm that how I’m doing things is correct?

[szhu]

Oh there’s also #97