feat(dev-infra): add support for minBodyLengthTypeExcludes to commit-message validation (#37764)

This feature will allow us to exclude certain commits from the 100 chars minBodyLength requirement for commit
messages which is hard to satisfy for commits that make trivial changes (e.g. fixing typos in docs or comments).

PR Close #37764

dev-infra/commit-message/validate.spec.ts

@@ -10,19 +10,22 @@
 import * as validateConfig from './config';
 import {validateCommitMessage} from './validate';
 
+type CommitMessageConfig = validateConfig.CommitMessageConfig;
+
+
 // Constants
-const config = {
-  'commitMessage': {
-    'maxLineLength': 120,
-    'minBodyLength': 0,
-    'types': [
+const config: {commitMessage: CommitMessageConfig} = {
+  commitMessage: {
+    maxLineLength: 120,
+    minBodyLength: 0,
+    types: [
       'feat',
       'fix',
       'refactor',
       'release',
       'style',
     ],
-    'scopes': [
+    scopes: [
       'common',
       'compiler',
       'core',
@@ -224,5 +227,42 @@ describe('validate-commit-message.js', () => {
         });
       });
     });
+
+    describe('minBodyLength', () => {
+      const minBodyLengthConfig: {commitMessage: CommitMessageConfig} = {
+        commitMessage: {
+          maxLineLength: 120,
+          minBodyLength: 30,
+          minBodyLengthTypeExcludes: ['docs'],
+          types: ['fix', 'docs'],
+          scopes: ['core']
+        }
+      };
+
+      beforeEach(() => {
+        (validateConfig.getCommitMessageConfig as jasmine.Spy).and.returnValue(minBodyLengthConfig);
+      });
+
+      it('should fail validation if the body is shorter than `minBodyLength`', () => {
+        expect(validateCommitMessage(
+                   'fix(core): something\n\n Explanation of the motivation behind this change'))
+            .toBe(VALID);
+        expect(validateCommitMessage('fix(core): something\n\n too short')).toBe(INVALID);
+        expect(lastError).toContain(
+            'The commit message body does not meet the minimum length of 30 characters');
+        expect(validateCommitMessage('fix(core): something')).toBe(INVALID);
+        expect(lastError).toContain(
+            'The commit message body does not meet the minimum length of 30 characters');
+      });
+
+      it('should pass validation if the body is shorter than `minBodyLength` but the commit type is in the `minBodyLengthTypeExclusions` list',
+         () => {
+           expect(validateCommitMessage('docs: just fixing a typo')).toBe(VALID);
+           expect(validateCommitMessage('docs(core): just fixing a typo')).toBe(VALID);
+           expect(validateCommitMessage(
+                      'docs(core): just fixing a typo\n\nThis was just a silly typo.'))
+               .toBe(VALID);
+         });
+    });
   });
 });