Check if startsWith exists before setting it (#14)

* Check if startsWith exists before setting it

* fix linting issue

* Try updating nyc

* Remove node 4 and node 6 from CI

* Ignore outdated bits from coverage

Author: karthiknadig

.github/workflows/test-macos.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 10, 8, 6, 4]
+        node: [12, 10, 8]
     steps:
       - name: Setup repo
         uses: actions/checkout@v2

.github/workflows/test-ubuntu.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 10, 8, 6, 4]
+        node: [12, 10, 8]
     steps:
       - name: Setup repo
         uses: actions/checkout@v2

.github/workflows/test-windows.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node: [12, 10, 8, 6, 4]
+        node: [12, 10, 8]
     steps:
       - name: Setup repo
         uses: actions/checkout@v2

index.js

@@ -9,11 +9,14 @@ function pify(fn, arg1, arg2) {
   });
 }
 
-// The method startsWith is not defined on string objects in node 0.10
-// eslint-disable-next-line no-extend-native
-String.prototype.startsWith = function(suffix) {
-  return this.substring(0, suffix.length) === suffix;
-};
+/* istanbul ignore next */
+if (!String.prototype.startsWith) {
+  // The method startsWith is not defined on string objects in node 0.10
+  // eslint-disable-next-line no-extend-native
+  String.prototype.startsWith = function(suffix) {
+    return this.substring(0, suffix.length) === suffix;
+  };
+}
 
 var pidtree = require('./lib/pidtree');
 

package.json

@@ -55,7 +55,7 @@
     "mockery": "^2.1.0",
     "np": "^2.20.1",
     "npm-check": "^5.9.2",
-    "nyc": "^11.6.0",
+    "nyc": "^15.1.0",
     "pify": "^3.0.0",
     "string-to-stream": "^1.1.0",
     "through": "^2.3.8",