Add baseline switch to nyc instrument command

Author: Andrew Finlay

index.js

@@ -342,6 +342,12 @@ const instrumentOnly = {
 		type: 'boolean',
 		default: false,
 		nycCommands: nycCommands.instrumentOnly
+	},
+	baseline: {
+		description: 'should nyc create a baseline coverage file?',
+		type: 'boolean',
+		default: false,
+		nycCommands: nycCommands.instrumentOnly
 	}
 };
 

tap-snapshots/test-test.js-TAP.test.js

@@ -76,6 +76,7 @@ Object {
   "all": false,
   "autoWrap": true,
   "babelCache": false,
+  "baseline": false,
   "branches": 0,
   "cache": true,
   "checkCoverage": false,