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