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'use strict'
var convertSourceMap = require('convert-source-map')
var mergeSourceMap = require('merge-source-map')
function InstrumenterIstanbul (cwd, options) {
var istanbul = InstrumenterIstanbul.istanbul()
var instrumenter = istanbul.createInstrumenter({
autoWrap: true,
coverageVariable: '__coverage__',
embedSource: true,
noCompact: false,
preserveComments: true,
produceSourceMap: options.produceSourceMap,
esModules: true
})
return {
instrumentSync: function (code, filename, sourceMap) {
var instrumented = instrumenter.instrumentSync(code, filename)
// the instrumenter can optionally produce source maps,
// this is useful for features like remapping stack-traces.
// TODO: test source-map merging logic.
if (options.produceSourceMap) {
var lastSourceMap = instrumenter.lastSourceMap()
if (lastSourceMap) {
if (sourceMap) {
lastSourceMap = mergeSourceMap(
sourceMap.toObject(),
lastSourceMap
)
}
instrumented += '\n' + convertSourceMap.fromObject(lastSourceMap).toComment()
}
}
return instrumented
},
lastFileCoverage: function () {
return instrumenter.lastFileCoverage()
}
}
}
InstrumenterIstanbul.istanbul = function () {
InstrumenterIstanbul._istanbul || (InstrumenterIstanbul._istanbul = require('istanbul-lib-instrument'))
return InstrumenterIstanbul._istanbul || (InstrumenterIstanbul._istanbul = require('istanbul'))
}
module.exports = InstrumenterIstanbul
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