feat: checking for extends options to be type of string

Fixes release-it#1180

lib/index.js

@@ -14,7 +14,7 @@ const runTasks = async (opts, di) => {
     Object.assign(container, di);
     container.config = container.config || new Config(opts);
 
-    if ('extends' in container.config.options) {
+    if (typeof container.config.options?.extends === 'string') {
       /**
        * If the configuration has an 'extends' property, fetch the remote configuration
        * and merge it into the local configuration options.

test/tasks.interactive.js

@@ -113,6 +113,8 @@ test.serial('should run tasks using extended configuration', async t => {
 
   const { name, latestVersion, version } = await runTasks({}, container);
 
+  t.is(fetchStub.callCount, 1);
+
   const commands = _.flatten(exec.args).filter(arg => typeof arg === 'string' && arg.startsWith('echo'));
 
   t.true(commands.includes(validationExtendedConfiguration));
@@ -124,6 +126,29 @@ test.serial('should run tasks using extended configuration', async t => {
   fetchStub.restore();
 });
 
+test.serial('should run tasks not using extended configuration as it is not a string', async t => {
+  sh.mv('.git', 'foo');
+
+  const fetchStub = sandbox.stub(global, 'fetch');
+
+  const config = {
+    $schema: 'https://unpkg.com/release-it@17/schema/release-it.json',
+    extends: false
+  };
+
+  const container = getContainer(config);
+
+  const { name, latestVersion, version } = await runTasks({}, container);
+
+  t.is(fetchStub.callCount, 0);
+
+  t.is(version, '0.0.1');
+  t.true(log.obtrusive.firstCall.args[0].includes(`release ${name} (currently at ${latestVersion})`));
+  t.regex(log.log.lastCall.args[0], /Done \(in [0-9]+s\.\)/);
+
+  fetchStub.restore();
+});
+
 test.serial('should not run hooks for disabled release-cycle methods', async t => {
   const hooks = getHooks(['version', 'git', 'github', 'gitlab', 'npm']);