Disallow equality assertions with boolean, null, and undefined.

Require the more descriptive `assert.isTrue`, `assert.isFalse`,
`assert.isNull`, `assert.isUndefined`, and friends instead, which also
produce a more meaningful error message than the generic
`assert.strictEqual`, `assert.deepEqual`, and friends.

Bug: 386335487
Change-Id: Ic58a07381196c358a43857b53364d74076e9c7e8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6113833
Reviewed-by: Changhao Han <changhaohan@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>

front_end/models/javascript_metadata/JavaScriptMetadata.test.ts

@@ -18,7 +18,7 @@ describe('JavaScriptMetadata', () => {
 
   it('does not retrieve native signatures that are bound to an instance', () => {
     const signatures = metadata.signaturesForNativeFunction('find');
-    assert.deepEqual(signatures, null);
+    assert.isNull(signatures);
   });
 
   describe('with static methods', () => {
@@ -29,12 +29,12 @@ describe('JavaScriptMetadata', () => {
 
     it('does not retrieve methods that are bound to an instance', () => {
       const signatures = metadata.signaturesForStaticMethod('includes', 'Array');
-      assert.deepEqual(signatures, null);
+      assert.isNull(signatures);
     });
 
     it('handles a non-existing class', () => {
       const signatures = metadata.signaturesForStaticMethod('includes', 'bogus');
-      assert.deepEqual(signatures, null);
+      assert.isNull(signatures);
     });
   });
 
@@ -46,17 +46,17 @@ describe('JavaScriptMetadata', () => {
 
     it('does not retrieve methods that are unbound', () => {
       const signatures = metadata.signaturesForInstanceMethod('webkitRequestFullScreen', 'window');
-      assert.deepEqual(signatures, null);
+      assert.isNull(signatures);
     });
 
     it('does not retrieve static methods', () => {
       const signatures = metadata.signaturesForInstanceMethod('from', 'Array');
-      assert.deepEqual(signatures, null);
+      assert.isNull(signatures);
     });
 
     it('handles a non-existing class', () => {
       const signatures = metadata.signaturesForInstanceMethod('from', 'Sheep');
-      assert.deepEqual(signatures, null);
+      assert.isNull(signatures);
     });
   });
 });