refactor(config): [rules] prefer trailer-exists over signed-off-by

- conventional-changelog/commitlint#2578
- allows use of `Co-authored-by` trailer
- requires use of `BREAKING-CHANGE` trailer over `BREAKING CHANGE` keyword

Signed-off-by: Lexus Drumgold <unicornware@flexdevelopment.llc>

Author: unicornware

Diff for: CONTRIBUTING.md

@@ -168,7 +168,7 @@ This means every commit must conform to the following format:
 
 [body]
 
-[BREAKING CHANGE: <change>]
+[BREAKING-CHANGE: <change>]
 
 [footer(s)]
 ```

Diff for: README.md

@@ -33,7 +33,6 @@ Shareable [`commitlint`][1] config enforcing [conventional commits][2]
     - [`scope-enum`](#scope-enum)
     - [`scope-max-length`](#scope-max-length)
     - [`scope-min-length`](#scope-min-length)
-    - [`signed-off-by`](#signed-off-by)
     - [`subject-empty`](#subject-empty)
     - [`subject-full-stop`](#subject-full-stop)
     - [`subject-min-length`](#subject-min-length)
@@ -271,16 +270,6 @@ code when not met.
   min(scopes())
   ```
 
-#### `signed-off-by`
-
-- **condition**: `message` has `value`
-- **rule**: `always`
-- **value**:
-
-  ```ts
-  'Signed-off-by:'
-  ```
-
 #### `subject-empty`
 
 - **condition**: `subject` is empty

Diff for: src/config/__snapshots__/rules.integration.snap

@@ -123,23 +123,6 @@ exports[`integration:config/rules > @commitlint/lint > scope-min-length > should
 ]
 `;
 
-exports[`integration:config/rules > @commitlint/lint > signed-off-by > should error without sign off 1`] = `
-[
-  {
-    "level": 2,
-    "message": "message must be signed off",
-    "name": "signed-off-by",
-    "valid": false,
-  },
-  {
-    "level": 2,
-    "message": "message must have \`Signed-off-by:\` trailer",
-    "name": "trailer-exists",
-    "valid": false,
-  },
-]
-`;
-
 exports[`integration:config/rules > @commitlint/lint > subject-empty > should error on missing subject 1`] = `
 [
   {
@@ -187,12 +170,6 @@ exports[`integration:config/rules > @commitlint/lint > subject-min-length > shou
 
 exports[`integration:config/rules > @commitlint/lint > trailer-exists > should error on missing "Signed-off-by" trailer 1`] = `
 [
-  {
-    "level": 2,
-    "message": "message must be signed off",
-    "name": "signed-off-by",
-    "valid": false,
-  },
   {
     "level": 2,
     "message": "message must have \`Signed-off-by:\` trailer",

Diff for: src/config/__tests__/parser-preset.spec.ts

@@ -226,8 +226,8 @@ describe('unit:config/parserPreset', () => {
         subject = testSubject.parserOpts.noteKeywords
       })
 
-      it('should only contain 2 keywords', () => {
-        expect(subject).to.deep.equal(['BREAKING CHANGE', 'BREAKING-CHANGE'])
+      it('should only contain 1 keyword', () => {
+        expect(subject).to.deep.equal(['BREAKING-CHANGE'])
       })
     })
 

Diff for: src/config/__tests__/rules.integration.spec.ts

@@ -145,7 +145,7 @@ describe('integration:config/rules', () => {
       it('should error if footer comes after 1 new line', async () => {
         // Arrange
         const commit: string =
-          'test: some message\n\nbody\nBREAKING CHANGE: It will be significant'
+          'test: some message\n\nbody\nBREAKING-CHANGE: It will be significant'
 
         // Act
         const result = await linter(signoff(commit, 0))
@@ -355,26 +355,8 @@ describe('integration:config/rules', () => {
     })
 
     describe('signed-off-by', () => {
-      let rule: string
-      let severity: Severity
-
-      beforeAll(() => {
-        rule = 'signed-off-by'
-        severity = Severity.Error
-      })
-
-      it('should error without sign off', async () => {
-        // Arrange
-        const commit: string =
-          'chore(tests): [codecov] label critical files\n\n- https://docs.codecov.com/docs/manual-critical-file-labelling'
-
-        // Act
-        const result = await linter(commit)
-
-        // Expect
-        expect(result.errors).to.have.ruleOutcome(rule, severity)
-        expect(result.warnings).to.be.an('array').that.is.empty
-        expect(result.errors).toMatchSnapshot()
+      it('should be disabled', () => {
+        expect(testSubject['body-case']).to.be.level(Severity.Disabled)
       })
     })
 

Diff for: src/config/parser-preset.ts

@@ -29,7 +29,7 @@ const parserPreset: ParserPreset = {
     issuePrefixesCaseSensitive: true,
     mergeCorrespondence: null,
     mergePattern: null,
-    noteKeywords: ['BREAKING CHANGE', 'BREAKING-CHANGE'],
+    noteKeywords: ['BREAKING-CHANGE'],
     referenceActions: Object.values(ReferenceAction),
     revertCorrespondence: [
       'type',

Diff for: src/config/rules.ts

@@ -42,7 +42,7 @@ const rules: RulesConfig = {
   'scope-enum': [Severity.Error, 'always', scopes()],
   'scope-max-length': [Severity.Error, 'always', max(scopes())],
   'scope-min-length': [Severity.Error, 'always', min(scopes())],
-  'signed-off-by': [Severity.Error, 'always', 'Signed-off-by:'],
+  'signed-off-by': [Severity.Disabled],
   'subject-case': [Severity.Disabled],
   'subject-empty': [Severity.Error, 'never'],
   'subject-exclamation-mark': [Severity.Disabled],

Diff for: src/types/__tests__/note-keyword.spec-d.ts

@@ -6,10 +6,6 @@
 import type TestSubject from '../note-keyword'
 
 describe('unit-d:types/NoteKeyword', () => {
-  it('should extract "BREAKING CHANGE"', () => {
-    expectTypeOf<TestSubject>().extract('BREAKING CHANGE').toBeString()
-  })
-
   it('should extract "BREAKING-CHANGE"', () => {
     expectTypeOf<TestSubject>().extract('BREAKING-CHANGE').toBeString()
   })

Diff for: src/types/note-keyword.ts

@@ -8,6 +8,6 @@
  *
  * @see https://github.com/conventional-changelog/conventional-changelog/blob/master/packages/conventional-commits-parser/README.md#notekeywords
  */
-type NoteKeyword = 'BREAKING CHANGE' | 'BREAKING-CHANGE'
+type NoteKeyword = 'BREAKING-CHANGE'
 
 export type { NoteKeyword as default }