Move private APIs to private namespace

Fixes #2078

spec/core/jasmineNamespaceSpec.js

@@ -0,0 +1,77 @@
+describe('The jasmine namespace', function() {
+  it('includes all expected properties', function() {
+    const actualKeys = new Set(Object.keys(jasmineUnderTest));
+    // toEqual doesn't generate diffs for set comparisons. Check this way
+    // instead so we get readable failure output.
+    expect(setDifference(expectedKeys(), actualKeys)).toEqual(new Set());
+  });
+
+  it('does not include any unexpected properties', function() {
+    const actualKeys = new Set(Object.keys(jasmineUnderTest));
+    // toEqual doesn't generate diffs for set comparisons. Check this way
+    // instead so we get readable failure output.
+    expect(setDifference(actualKeys, expectedKeys())).toEqual(new Set());
+  });
+
+  function expectedKeys() {
+    // Does not include properties added by requireInterface(), since that isn't
+    // called by defineJasmineUnderTest.js/nodeDefineJasmineUnderTest.js.
+    const result = new Set([
+      'MAX_PRETTY_PRINT_ARRAY_LENGTH',
+      'MAX_PRETTY_PRINT_CHARS',
+      'MAX_PRETTY_PRINT_DEPTH',
+      'debugLog',
+      'getEnv',
+      'isSpy',
+      'ParallelReportDispatcher',
+      'private',
+      'spyOnGlobalErrorsAsync',
+      'Timer',
+      'version',
+
+      // Asymmetric equality testers
+      'any',
+      'anything',
+      'arrayContaining',
+      'arrayWithExactContents',
+      'empty',
+      'falsy',
+      'is',
+      'mapContaining',
+      'notEmpty',
+      'objectContaining',
+      'setContaining',
+      'stringContaining',
+      'stringMatching',
+      'truthy',
+
+      // Currently undocumented but used in browser boot files, so it's
+      // effectively public
+      'getGlobal'
+    ]);
+
+    if (typeof window !== 'undefined') {
+      // jasmine-html.js
+      result.add('HtmlReporter');
+      result.add('HtmlSpecFilter');
+      result.add('HtmlExactSpecFilter');
+      result.add('QueryString');
+    }
+
+    return result;
+  }
+
+  // Can't use Set#difference yet because it isn't available in Node <22,
+  // Firefox <108, or Safari <17.
+  function setDifference(a, b) {
+    const result = new Set();
+
+    for (const v of a) {
+      if (!b.has(v)) {
+        result.add(v);
+      }
+    }
+
+    return result;
+  }
+});