# istanbul-lib-source-maps | |
[](https://travis-ci.org/istanbuljs/istanbuljs) | |
Source map support for istanbuljs. | |
## Debugging | |
_istanbul-lib-source-maps_ uses the [debug](https://www.npmjs.com/package/debug) module. | |
Run your application with the environment variable `DEBUG=istanbuljs`, to receive debug | |
output. |