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index.js
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index.js
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import {realpathSync} from 'fs'
import {dirname} from 'path'
import {programVisitor} from 'istanbul-lib-instrument'
const testExclude = require('test-exclude')
const findUp = require('find-up')
function getRealpath (n) {
try {
return realpathSync(n) || n
} catch (e) {
return n
}
}
function makeShouldSkip () {
let exclude
return function shouldSkip (file, opts) {
if (!exclude) {
const cwd = getRealpath(process.env.NYC_CWD || process.cwd())
const nycConfig = process.env.NYC_CONFIG ? JSON.parse(process.env.NYC_CONFIG) : {}
let config = {}
if (Object.keys(opts).length > 0) {
// explicitly configuring options in babel
// takes precendence.
config = opts
} else if (nycConfig.include || nycConfig.exclude) {
// nyc was configured in a parent process (keep these settings).
config = {
include: nycConfig.include,
exclude: nycConfig.exclude
}
} else {
// fallback to loading config from key in package.json.
config = {
configKey: 'nyc',
configPath: dirname(findUp.sync('package.json', { cwd }))
}
}
exclude = testExclude(Object.assign(
{ cwd },
config
))
}
return !exclude.shouldInstrument(file)
}
}
function makeVisitor ({types: t}) {
const shouldSkip = makeShouldSkip()
return {
visitor: {
Program: {
enter (path) {
this.__dv__ = null
const realPath = getRealpath(this.file.opts.filename)
if (shouldSkip(realPath, this.opts)) {
return
}
let { inputSourceMap } = this.opts
if (this.opts.useInlineSourceMaps !== false) {
inputSourceMap = inputSourceMap || this.file.opts.inputSourceMap
}
this.__dv__ = programVisitor(t, realPath, {
coverageVariable: '__coverage__',
inputSourceMap
})
this.__dv__.enter(path)
},
exit (path) {
if (!this.__dv__) {
return
}
this.__dv__.exit(path)
}
}
}
}
}
export default makeVisitor