1 | ## istanbul-lib-instrument
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3 | [![Build Status](https://travis-ci.org/istanbuljs/istanbul-lib-instrument.svg?branch=master)](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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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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22 |
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