feat: Drop node.js 6, upgrade dependencies (#1134)

BREAKING CHANGE: Node.js 8 is now required to run nyc

.taprc

@@ -0,0 +1,7 @@
+{
+	"test-ignore": "^test/(helpers|src)/",
+	"coverage": false,
+	"jobs": 1,
+	"timeout": 360,
+	"bail": false
+}

.travis.yml

@@ -7,7 +7,6 @@ node_js:
   - "node"
   - 10
   - 8
-  - 6
 matrix:
 ## An ENOMEM error occurs with 10+ under Travis-CI for Windows.
 ## Disable until we can determine the cause.

bin/wrap.js

@@ -16,8 +16,11 @@ if (process.env.NYC_PROCESSINFO_EXTERNAL_ID) {
 }
 
 if (process.env.NYC_CONFIG_OVERRIDE) {
-  var override = JSON.parse(process.env.NYC_CONFIG_OVERRIDE)
-  config = Object.assign(config, override)
+  const override = JSON.parse(process.env.NYC_CONFIG_OVERRIDE)
+  config = {
+    ...config,
+    ...override
+  }
   process.env.NYC_CONFIG = JSON.stringify(config)
 }
 

index.js

@@ -393,20 +393,18 @@ class NYC {
   }
 
   report () {
-    var tree
-    var map = this.getCoverageMapFromAllCoverageFiles()
-    var context = libReport.createContext({
+    const context = libReport.createContext({
       dir: this.reportDirectory(),
-      watermarks: this.config.watermarks
+      watermarks: this.config.watermarks,
+      coverageMap: this.getCoverageMapFromAllCoverageFiles()
     })
 
-    tree = libReport.summarizers.pkg(map)
-
     this.reporter.forEach((_reporter) => {
-      tree.visit(reports.create(_reporter, {
+      reports.create(_reporter, {
         skipEmpty: this.config.skipEmpty,
-        skipFull: this.config.skipFull
-      }), context)
+        skipFull: this.config.skipFull,
+        maxCols: process.stdout.columns || 100
+      }).execute(context)
     })
 
     if (this._showProcessTree) {

lib/instrumenters/istanbul.js

@@ -8,16 +8,17 @@ function InstrumenterIstanbul (options) {
   const { plugins } = options
   const configPlugins = plugins ? { plugins } : {}
 
-  const instrumenter = createInstrumenter(Object.assign({
+  const instrumenter = createInstrumenter({
     autoWrap: true,
     coverageVariable: '__coverage__',
     embedSource: true,
     compact: options.compact,
     preserveComments: options.preserveComments,
     produceSourceMap: options.produceSourceMap,
     ignoreClassMethods: options.ignoreClassMethods,
-    esModules: options.esModules
-  }, configPlugins))
+    esModules: options.esModules,
+    ...configPlugins
+  })
 
   return {
     instrumentSync (code, filename, sourceMap) {