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