feat: Expect plugins to return Promises

BREAKING CHANGE: Each plugin is expected to return an async function or a Promise returning function. The callback parameter is not passed to plugins anymore.

test/fixtures/multi-plugin.js

@@ -1,21 +1,8 @@
 module.exports = {
-  verifyConditions(config, options, cb) {
-    cb();
-  },
-
-  getLastRelease(config, options, cb) {
-    cb();
-  },
-  analyzeCommits(config, options, cb) {
-    cb();
-  },
-  verifyRelease(config, options, cb) {
-    cb();
-  },
-  generateNotes(config, options, cb) {
-    cb();
-  },
-  publish(config, options, cb) {
-    cb();
-  },
+  verifyConditions: () => {},
+  getLastRelease: () => {},
+  analyzeCommits: () => {},
+  verifyRelease: () => {},
+  generateNotes: () => {},
+  publish: () => {},
 };

test/fixtures/plugin-error-inherited.js

@@ -9,6 +9,6 @@ class InheritedError extends SemanticReleaseError {
   }
 }
 
-module.exports = function(config, options, cb) {
-  cb(new InheritedError('Inherited error', 'EINHERITED'));
+module.exports = () => {
+  throw new InheritedError('Inherited error', 'EINHERITED');
 };

test/fixtures/plugin-error.js

@@ -1,5 +1,5 @@
-module.exports = function(config, options, cb) {
+module.exports = () => {
   const error = new Error('a');
   error.errorProperty = 'errorProperty';
-  cb(error);
+  throw error;
 };

test/fixtures/plugin-noop.js

@@ -1,3 +1 @@
-module.exports = (config, options, cb) => {
-  cb(null);
-};
+module.exports = () => {};

test/fixtures/plugin-result-config.js

@@ -1,3 +1 @@
-module.exports = function(pluginConfig, options, cb) {
-  cb(null, {pluginConfig, options});
-};
+module.exports = (pluginConfig, options) => ({pluginConfig, options});

test/index.test.js

@@ -1,4 +1,3 @@
-import {callbackify} from 'util';
 import test from 'ava';
 import {writeJson} from 'fs-extra';
 import proxyquire from 'proxyquire';
@@ -57,12 +56,12 @@ test.serial('Plugins are called with expected values', async t => {
 
   const options = {
     branch: 'master',
-    verifyConditions: [callbackify(verifyConditions1), callbackify(verifyConditions2)],
-    getLastRelease: callbackify(getLastRelease),
-    analyzeCommits: callbackify(analyzeCommits),
-    verifyRelease: callbackify(verifyRelease),
-    generateNotes: callbackify(generateNotes),
-    publish: callbackify(publish),
+    verifyConditions: [verifyConditions1, verifyConditions2],
+    getLastRelease,
+    analyzeCommits,
+    verifyRelease,
+    generateNotes,
+    publish,
   };
   const pkg = {name, version: '0.0.0-dev'};
   normalizeData(pkg);
@@ -140,12 +139,12 @@ test.serial('Use new gitHead, and recreate release notes if a publish plugin cre
 
   const options = {
     branch: 'master',
-    verifyConditions: callbackify(stub().resolves()),
-    getLastRelease: callbackify(stub().resolves(lastRelease)),
-    analyzeCommits: callbackify(stub().resolves(nextRelease.type)),
-    verifyRelease: callbackify(stub().resolves()),
-    generateNotes: callbackify(generateNotes),
-    publish: [callbackify(publish1), callbackify(publish2)],
+    verifyConditions: stub().resolves(),
+    getLastRelease: stub().resolves(lastRelease),
+    analyzeCommits: stub().resolves(nextRelease.type),
+    verifyRelease: stub().resolves(),
+    generateNotes,
+    publish: [publish1, publish2],
   };
 
   await writeJson('./package.json', {});
@@ -188,12 +187,12 @@ test.serial('Dry-run skips verifyConditions and publish', async t => {
   const options = {
     dryRun: true,
     branch: 'master',
-    verifyConditions: callbackify(verifyConditions),
-    getLastRelease: callbackify(getLastRelease),
-    analyzeCommits: callbackify(analyzeCommits),
-    verifyRelease: callbackify(verifyRelease),
-    generateNotes: callbackify(generateNotes),
-    publish: callbackify(publish),
+    verifyConditions,
+    getLastRelease,
+    analyzeCommits,
+    verifyRelease,
+    generateNotes,
+    publish,
   };
   const pkg = {name, version: '0.0.0-dev'};
   normalizeData(pkg);

test/plugins/normalize.test.js

@@ -1,4 +1,3 @@
-import {callbackify} from 'util';
 import test from 'ava';
 import {noop} from 'lodash';
 import {stub, match} from 'sinon';
@@ -39,7 +38,7 @@ test('Normalize and load plugin that retuns multiple functions', t => {
 
 test('Wrap plugin in a function that validate the output of the plugin', async t => {
   const pluginFunction = stub().resolves(1);
-  const plugin = normalize('', callbackify(pluginFunction), t.context.logger, {
+  const plugin = normalize('', pluginFunction, t.context.logger, {
     validator: output => output === 1,
     message: 'The output must be 1',
   });
@@ -53,7 +52,7 @@ test('Wrap plugin in a function that validate the output of the plugin', async t
 
 test('Plugin is called with "pluginConfig" (omitting "path") and input', async t => {
   const pluginFunction = stub().resolves();
-  const conf = {path: callbackify(pluginFunction), conf: 'confValue'};
+  const conf = {path: pluginFunction, conf: 'confValue'};
   const plugin = normalize('', conf, t.context.logger);
   await plugin('param');
 
@@ -61,9 +60,8 @@ test('Plugin is called with "pluginConfig" (omitting "path") and input', async t
 });
 
 test('Prevent plugins to modify "pluginConfig"', async t => {
-  const pluginFunction = stub().callsFake((pluginConfig, options, cb) => {
+  const pluginFunction = stub().callsFake(pluginConfig => {
     pluginConfig.conf.subConf = 'otherConf';
-    cb();
   });
   const conf = {path: pluginFunction, conf: {subConf: 'originalConf'}};
   const plugin = normalize('', conf, t.context.logger);
@@ -73,9 +71,8 @@ test('Prevent plugins to modify "pluginConfig"', async t => {
 });
 
 test('Prevent plugins to modify its input', async t => {
-  const pluginFunction = stub().callsFake((pluginConfig, options, cb) => {
+  const pluginFunction = stub().callsFake((pluginConfig, options) => {
     options.param.subParam = 'otherParam';
-    cb();
   });
   const input = {param: {subParam: 'originalSubParam'}};
   const plugin = normalize('', pluginFunction, t.context.logger);