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| 1 | ## istanbul-lib-instrument
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| 2 |
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| 3 | [](https://travis-ci.org/istanbuljs/istanbul-lib-instrument)
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| 4 |
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| 5 | Istanbul instrumenter library.
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| 6 |
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| 7 | Version 1.1.x now implements instrumentation using `Babel`. The implementation is inspired
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| 8 | by prior art by @dtinth as demonstrated in the `__coverage__` babel plugin.
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| 9 |
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| 10 | It provides 2 "modes" of instrumentation.
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| 11 |
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| 12 | - The old API that is mostly unchanged (except for incompatibilities noted) and
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| 13 | performs the instrumentation using babel as a library.
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| 14 |
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| 15 | - A `programVisitor` function for the Babel AST that can be used by a Babel plugin
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| 16 | to emit instrumentation for ES6 code directly without any source map
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| 17 | processing. This is the preferred path for babel users. The Babel plugin is
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| 18 | called `babel-plugin-istanbul`.
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| 19 |
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| 20 | Incompatibilities and changes to instrumentation behavior can be found in
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| 21 | [v0-changes.md](v0-changes.md).
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