Allow use without creating globals

* Fixes #1235

lib/jasmine-core.js

@@ -1,6 +1,42 @@
-module.exports = require("./jasmine-core/jasmine.js");
+/**
+ * Note: Only available on Node.
+ * @module jasmine-core
+ */
+
+const jasmineRequire = require('./jasmine-core/jasmine.js');
+module.exports = jasmineRequire;
+
+/**
+ * Boots a copy of Jasmine and returns an object as described in {@link jasmine}.
+ * @type {function}
+ * @return {jasmine}
+ */
 module.exports.boot = require('./jasmine-core/node_boot.js');
 
+/**
+ * Boots a copy of Jasmine and returns an object containing the properties
+ * that would normally be added to the global object. If noGlobals is called
+ * multiple times, the same object is returned every time.
+ *
+ * Do not call boot() if you also call noGlobals().
+ *
+ * @example
+ * const {describe, beforeEach, it, expect, jasmine} = require('jasmine-core').noGlobals();
+ */
+module.exports.noGlobals = (function() {
+  let jasmineInterface;
+
+  return function bootWithoutGlobals() {
+    if (!jasmineInterface) {
+      const jasmine = jasmineRequire.core(jasmineRequire);
+      const env = jasmine.getEnv({ suppressLoadErrors: true });
+      jasmineInterface = jasmineRequire.interface(jasmine, env);
+    }
+
+    return jasmineInterface;
+  };
+}());
+
 var path = require('path'),
     fs = require('fs');
 

lib/jasmine-core/jasmine.js

@@ -3482,6 +3482,8 @@ getJasmineRequireObj().CompleteOnFirstErrorSkipPolicy = function(j$) {
   }
 
   CompleteOnFirstErrorSkipPolicy.prototype.skipTo = function(lastRanFnIx) {
+    let i;
+
     for (
       i = lastRanFnIx + 1;
       i < this.queueableFns_.length && this.shouldSkip_(i);