feat(composer): support composer platform package constraint (#13186)

lib/manager/composer/utils.spec.ts

@@ -27,6 +27,18 @@ describe('manager/composer/utils', () => {
       ).toEqual({ composer: '1.1.0' });
     });
 
+    it('returns from composer platform require', () => {
+      expect(
+        extractContraints({ require: { php: '^8.1', composer: '2.2.0' } }, {})
+      ).toEqual({ php: '^8.1', composer: '2.2.0' });
+    });
+
+    it('returns from composer platform require-dev', () => {
+      expect(
+        extractContraints({ 'require-dev': { composer: '^2.2' } }, {})
+      ).toEqual({ composer: '^2.2' });
+    });
+
     it('returns from composer-runtime-api', () => {
       expect(
         extractContraints({ require: { 'composer-runtime-api': '^1.1.0' } }, {})

lib/manager/composer/utils.ts

@@ -71,6 +71,12 @@ export function extractContraints(
   } else if (composerJson['require-dev']?.['composer/composer']) {
     res.composer = composerJson['require-dev']?.['composer/composer'];
   }
+  // composer platform package
+  else if (composerJson.require?.['composer']) {
+    res.composer = composerJson.require?.['composer'];
+  } else if (composerJson['require-dev']?.['composer']) {
+    res.composer = composerJson['require-dev']?.['composer'];
+  }
   // check last used composer version
   else if (lockParsed?.['plugin-api-version']) {
     const major = api.getMajor(lockParsed?.['plugin-api-version']);