| ## istanbul-lib-instrument |
| |
| [](https://travis-ci.org/istanbuljs/istanbul-lib-instrument) |
| |
| Istanbul instrumenter library. |
| |
| Version 1.1.x now implements instrumentation using `Babel`. The implementation is inspired |
| by prior art by @dtinth as demonstrated in the `__coverage__` babel plugin. |
| |
| It provides 2 "modes" of instrumentation. |
| |
| - The old API that is mostly unchanged (except for incompatibilities noted) and |
| performs the instrumentation using babel as a library. |
| |
| - A `programVisitor` function for the Babel AST that can be used by a Babel plugin |
| to emit instrumentation for ES6 code directly without any source map |
| processing. This is the preferred path for babel users. The Babel plugin is |
| called `babel-plugin-istanbul`. |
| |
| Incompatibilities and changes to instrumentation behavior can be found in |
| [v0-changes.md](v0-changes.md). |
