From 70c34fdffc2b5b48375ef564b4905ff780e21242 Mon Sep 17 00:00:00 2001
From: Timothy Lai <timothy.lai@smartbear.com>
Date: Fri, 21 Oct 2022 11:02:16 -0700
Subject: [PATCH] feat(ls): OpenAPI 3.x.x mutually exclusive lint rule for
 Media Type

---
 packages/apidom-ls/src/config/codes.ts        |  1 +
 .../lint/examples--mutually-exclusive.ts      | 21 +++++++++++++++++++
 .../config/openapi/media-type/lint/index.ts   |  9 +++++++-
 3 files changed, 30 insertions(+), 1 deletion(-)
 create mode 100644 packages/apidom-ls/src/config/openapi/media-type/lint/examples--mutually-exclusive.ts

diff --git a/packages/apidom-ls/src/config/codes.ts b/packages/apidom-ls/src/config/codes.ts
index ef290dbecd..d153ea3dba 100644
--- a/packages/apidom-ls/src/config/codes.ts
+++ b/packages/apidom-ls/src/config/codes.ts
@@ -723,6 +723,7 @@ enum ApilintCodes {
   OPENAPI3_0_MEDIA_TYPE_FIELD_SCHEMA_VALUES_TYPE = 5170100,
   OPENAPI3_0_MEDIA_TYPE_FIELD_EXAMPLES_VALUES_TYPE = 5170200,
   OPENAPI3_0_MEDIA_TYPE_FIELD_ENCODING_VALUES_TYPE = 5170300,
+  OPENAPI3_0_MEDIA_TYPE_FIELD_EXAMPLES_MUTUALLY_EXCLUSIVE,
 
   OPENAPI3_0_ENCODING = 5180000,
   OPENAPI3_0_ENCODING_FIELD_CONTENT_TYPE_TYPE = 5180100,
diff --git a/packages/apidom-ls/src/config/openapi/media-type/lint/examples--mutually-exclusive.ts b/packages/apidom-ls/src/config/openapi/media-type/lint/examples--mutually-exclusive.ts
new file mode 100644
index 0000000000..7cf99e8c1a
--- /dev/null
+++ b/packages/apidom-ls/src/config/openapi/media-type/lint/examples--mutually-exclusive.ts
@@ -0,0 +1,21 @@
+import ApilintCodes from '../../../codes';
+import { LinterMeta } from '../../../../apidom-language-types';
+
+const examplesMutuallyExclusiveLint: LinterMeta = {
+  code: ApilintCodes.OPENAPI3_0_MEDIA_TYPE_FIELD_EXAMPLES_MUTUALLY_EXCLUSIVE,
+  source: 'apilint',
+  message: 'The `example` field and `examples` field are mutually exclusive.',
+  severity: 1,
+  linterFunction: 'missingFields',
+  linterParams: [['examples']],
+  marker: 'key',
+  markerTarget: 'examples',
+  conditions: [
+    {
+      function: 'existFields',
+      params: [['example']],
+    },
+  ],
+};
+
+export default examplesMutuallyExclusiveLint;
diff --git a/packages/apidom-ls/src/config/openapi/media-type/lint/index.ts b/packages/apidom-ls/src/config/openapi/media-type/lint/index.ts
index a2df63b9d9..9226c5fe31 100644
--- a/packages/apidom-ls/src/config/openapi/media-type/lint/index.ts
+++ b/packages/apidom-ls/src/config/openapi/media-type/lint/index.ts
@@ -2,7 +2,14 @@ import allowedFieldsLint from './allowed-fields';
 import schemaTypeLint from './schema--type';
 import examplesValuesTypeLint from './examples--values-type';
 import encodingValuesTypeLint from './encoding--values-type';
+import examplesMutuallyExclusiveLint from './examples--mutually-exclusive';
 
-const lints = [schemaTypeLint, examplesValuesTypeLint, encodingValuesTypeLint, allowedFieldsLint];
+const lints = [
+  schemaTypeLint,
+  examplesValuesTypeLint,
+  encodingValuesTypeLint,
+  allowedFieldsLint,
+  examplesMutuallyExclusiveLint,
+];
 
 export default lints;