fix(load): add support for non-factory conventional parsers (#839)

@commitlint/load/fixtures/parser-preset-conventional-without-factory/commitlint.config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	parserPreset: 'conventional-changelog-conventionalcommits'
+};

@commitlint/load/fixtures/parser-preset-conventional-without-factory/package.json

@@ -0,0 +1,7 @@
+{
+    "name": "parser-preset-conventional-without-factory",
+    "version": "1.0.0",
+    "devDependencies": {
+        "conventional-changelog-conventionalcommits": "4.1.0"
+    }
+}

@commitlint/load/src/index.js

@@ -137,9 +137,17 @@ async function loadParserOpts(parserName, pendingParser) {
 		startsWith(parserName, 'conventional-changelog-')
 	) {
 		return await new Promise(resolve => {
-			parser.parserOpts((_, opts) => {
+			const result = parser.parserOpts((_, opts) => {
 				resolve(opts.parserOpts);
 			});
+
+			// If result has data or a promise, the parser doesn't support factory-init
+			// due to https://github.com/nodejs/promises-debugging/issues/16 it just quits, so let's use this fallback
+			if (result) {
+				Promise.resolve(result).then(opts => {
+					resolve(opts.parserOpts);
+				});
+			}
 		});
 	}
 

@commitlint/load/src/index.test.js

@@ -368,3 +368,17 @@ test('recursive resolves parser preset from conventional atom', async t => {
 	t.is(typeof actual.parserPreset.parserOpts, 'object');
 	t.deepEqual(actual.parserPreset.parserOpts.headerPattern, /^(:.*?:) (.*)$/);
 });
+
+test('resolves parser preset from conventional commits without factory support', async t => {
+	const cwd = await npm.bootstrap(
+		'fixtures/parser-preset-conventional-without-factory'
+	);
+	const actual = await load({}, {cwd});
+
+	t.is(actual.parserPreset.name, 'conventional-changelog-conventionalcommits');
+	t.is(typeof actual.parserPreset.parserOpts, 'object');
+	t.deepEqual(
+		actual.parserPreset.parserOpts.headerPattern,
+		/^(\w*)(?:\((.*)\))?!?: (.*)$/
+	);
+});