fix: Purge source-map cache before reporting if cache is disabled. (#1080)

Author: coreyfarrell

bin/nyc.js

@@ -67,6 +67,7 @@ if ([
 
     nyc.writeProcessIndex()
 
+    nyc.maybePurgeSourceMapCache()
     if (argv.checkCoverage) {
       nyc.checkCoverage({
         lines: argv.lines,

index.js

@@ -236,6 +236,12 @@ class NYC {
     return this._transform(code, filename)
   }
 
+  maybePurgeSourceMapCache () {
+    if (!this.cache) {
+      this.sourceMaps.purgeCache()
+    }
+  }
+
   _transformFactory (cacheDir) {
     const instrumenter = this.instrumenter()
     let instrumented

lib/source-maps.js

@@ -4,12 +4,16 @@ const libSourceMaps = require('istanbul-lib-source-maps')
 const fs = require('fs')
 const path = require('path')
 
-const sourceMapCache = libSourceMaps.createSourceMapStore()
 function SourceMaps (opts) {
   this.cache = opts.cache
   this.cacheDirectory = opts.cacheDirectory
   this.loadedMaps = {}
-  this._sourceMapCache = sourceMapCache
+  this._sourceMapCache = libSourceMaps.createSourceMapStore()
+}
+
+SourceMaps.prototype.purgeCache = function () {
+  this._sourceMapCache = libSourceMaps.createSourceMapStore()
+  this.loadedMaps = {}
 }
 
 SourceMaps.prototype.extractAndRegister = function (code, filename, hash) {