Accept source map input for the visitor #75
Merged
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If a source map is explicitly passed, prefer that, otherwise try and pluck an inline source map that babel may have already parsed from the file content.
Counterpart to - https://github.com/istanbuljs/istanbul-lib-instrument/pull/23/files#diff-c07343828715f64179d26d4c237cb63c
Ref - istanbuljs-archived-repos/istanbul-lib-source-maps#4
Context - upstream PR for jestjs/jest#2290. Jest provides instrumentation using babel-plugin-istanbul, and currently there's disparity with source map support between
createInstrumenter().instrumentSync()
and this babel plugin. This PR resolves that so both approaches can thread a source map through and have it attached to coverage.