fix(util): parse jsonc as jsonc (#35177)

lib/util/common.spec.ts

@@ -27,6 +27,14 @@ const onlyJson5parsableString = `
   "isMarried": false,
 }
 `;
+const validJsoncString = `
+{
+  // This is a comment
+  "name": "John Doe",
+  "age": 30,
+  "city": "New York"
+}
+`;
 
 describe('util/common', () => {
   beforeEach(() => hostRules.clear());
@@ -106,7 +114,7 @@ describe('util/common', () => {
       expect(() => parseJson(invalidJsonString, 'renovate.json')).toThrow();
     });
 
-    it('catches and warns if content parsing faield with JSON.parse but not with JSON5.parse', () => {
+    it('catches and warns if content parsing failed with JSON.parse but not with JSON5.parse', () => {
       expect(parseJson(onlyJson5parsableString, 'renovate.json')).toEqual({
         name: 'Bob',
         age: 35,
@@ -118,5 +126,29 @@ describe('util/common', () => {
         'File contents are invalid JSON but parse using JSON5. Support for this will be removed in a future release so please change to a support .json5 file name or ensure correct JSON syntax.',
       );
     });
+
+    it('does not warn if filename ends with .jsonc', () => {
+      parseJson(validJsoncString, 'renovate.jsonc');
+      expect(logger.logger.warn).not.toHaveBeenCalled();
+    });
+
+    it('does not warn if filename ends with .json5', () => {
+      parseJson(onlyJson5parsableString, 'renovate.json5');
+      expect(logger.logger.warn).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('parseJsonc', () => {
+    it('returns parsed jsonc', () => {
+      expect(parseJson(validJsoncString, 'renovate.jsonc')).toEqual({
+        name: 'John Doe',
+        age: 30,
+        city: 'New York',
+      });
+    });
+
+    it('throws error for invalid jsonc', () => {
+      expect(() => parseJson(invalidJsonString, 'renovate.jsonc')).toThrow();
+    });
   });
 });

lib/util/common.ts

@@ -1,4 +1,6 @@
 import JSON5 from 'json5';
+import * as JSONC from 'jsonc-parser';
+import type { JsonValue } from 'type-fest';
 import {
   BITBUCKET_API_USING_HOST_TYPES,
   BITBUCKET_SERVER_API_USING_HOST_TYPES,
@@ -80,21 +82,27 @@ export function noLeadingAtSymbol(input: string): string {
   return input.startsWith('@') ? input.slice(1) : input;
 }
 
-export function parseJson(content: string | null, filename: string): unknown {
+export function parseJson(content: string | null, filename: string): JsonValue {
   if (!content) {
     return null;
   }
 
-  return filename.endsWith('.json5')
-    ? JSON5.parse(content)
-    : parseJsonWithFallback(content, filename);
+  if (filename.endsWith('.jsonc')) {
+    return parseJsonc(content);
+  }
+
+  if (filename.endsWith('.json5')) {
+    return JSON5.parse(content);
+  }
+
+  return parseJsonWithFallback(content, filename);
 }
 
 export function parseJsonWithFallback(
   content: string,
   context: string,
-): unknown {
-  let parsedJson: unknown;
+): JsonValue {
+  let parsedJson: JsonValue;
 
   try {
     parsedJson = JSON.parse(content);
@@ -108,3 +116,12 @@ export function parseJsonWithFallback(
 
   return parsedJson;
 }
+
+export function parseJsonc(content: string): JsonValue {
+  const errors: JSONC.ParseError[] = [];
+  const value = JSONC.parse(content, errors, { allowTrailingComma: true });
+  if (errors.length === 0) {
+    return value;
+  }
+  throw new Error('Invalid JSONC');
+}

lib/util/schema-utils.ts

@@ -1,5 +1,4 @@
 import JSON5 from 'json5';
-import * as JSONC from 'jsonc-parser';
 import { DateTime } from 'luxon';
 import type { JsonArray, JsonValue } from 'type-fest';
 import {
@@ -11,6 +10,7 @@ import {
 } from 'zod';
 import { logger } from '../logger';
 import type { PackageDependency } from '../modules/manager/types';
+import { parseJsonc } from './common';
 import { parse as parseToml } from './toml';
 import type { YamlOptions } from './yaml';
 import { parseSingleYaml, parseYaml } from './yaml';
@@ -226,13 +226,12 @@ export const Json5 = z.string().transform((str, ctx): JsonValue => {
 });
 
 export const Jsonc = z.string().transform((str, ctx): JsonValue => {
-  const errors: JSONC.ParseError[] = [];
-  const value = JSONC.parse(str, errors, { allowTrailingComma: true });
-  if (errors.length === 0) {
-    return value;
+  try {
+    return parseJsonc(str);
+  } catch {
+    ctx.addIssue({ code: 'custom', message: 'Invalid JSONC' });
+    return z.NEVER;
   }
-  ctx.addIssue({ code: 'custom', message: 'Invalid JSONC' });
-  return z.NEVER;
 });
 
 export const UtcDate = z