fix(package): update yargs to version 12.0.0

cli.js

@@ -1,5 +1,3 @@
-const {pickBy, isUndefined} = require('lodash');
-
 const stringList = {
   type: 'string',
   array: true,
@@ -13,6 +11,7 @@ module.exports = async () => {
   const cli = require('yargs')
     .command('$0', 'Run automated package publishing', yargs => {
       yargs.demandCommand(0, 0).usage(`Run automated package publishing
+
 Usage:
   semantic-release [options] [plugins]`);
     })
@@ -20,7 +19,7 @@ Usage:
     .option('r', {alias: 'repository-url', describe: 'Git repository URL', type: 'string', group: 'Options'})
     .option('t', {alias: 'tag-format', describe: 'Git tag format', type: 'string', group: 'Options'})
     .option('e', {alias: 'extends', describe: 'Shareable configurations', ...stringList, group: 'Options'})
-    .option('ci', {describe: 'Toggle CI verifications', default: undefined, type: 'boolean', group: 'Options'})
+    .option('ci', {describe: 'Toggle CI verifications', type: 'boolean', group: 'Options'})
     .option('verify-conditions', {...stringList, group: 'Plugins'})
     .option('analyze-commits', {type: 'string', group: 'Plugins'})
     .option('verify-release', {...stringList, group: 'Plugins'})
@@ -29,16 +28,15 @@ Usage:
     .option('publish', {...stringList, group: 'Plugins'})
     .option('success', {...stringList, group: 'Plugins'})
     .option('fail', {...stringList, group: 'Plugins'})
-    .option('debug', {describe: 'Output debugging information', default: undefined, type: 'boolean', group: 'Options'})
-    .option('d', {alias: 'dry-run', describe: 'Skip publishing', default: undefined, type: 'boolean', group: 'Options'})
-    .option('h', {alias: 'help', default: undefined, group: 'Options'})
-    .option('v', {alias: 'version', default: undefined, group: 'Options'})
+    .option('debug', {describe: 'Output debugging information', type: 'boolean', group: 'Options'})
+    .option('d', {alias: 'dry-run', describe: 'Skip publishing', type: 'boolean', group: 'Options'})
+    .option('h', {alias: 'help', group: 'Options'})
+    .option('v', {alias: 'version', group: 'Options'})
     .strict(false)
     .exitProcess(false);
 
   try {
-    // Remove option with undefined values, as yargs sets non defined options as `undefined`
-    const {help, version, ...opts} = pickBy(cli.argv, value => !isUndefined(value));
+    const {help, version, ...opts} = cli.argv;
 
     if (Boolean(help) || Boolean(version)) {
       process.exitCode = 0;

lib/definitions/plugins.js

@@ -45,7 +45,7 @@ module.exports = {
   publish: {
     default: ['@semantic-release/npm', '@semantic-release/github'],
     config: {
-      validator: conf => Boolean(conf) && (isArray(conf) ? conf : [conf]).every(conf => validatePluginConfig(conf)),
+      validator: conf => !conf || (isArray(conf) ? conf : [conf]).every(conf => validatePluginConfig(conf)),
     },
     output: {
       validator: output => !output || isPlainObject(output),

package.json

@@ -44,7 +44,7 @@
     "read-pkg-up": "^4.0.0",
     "resolve-from": "^4.0.0",
     "semver": "^5.4.1",
-    "yargs": "^11.0.0"
+    "yargs": "^12.0.0"
   },
   "devDependencies": {
     "ava": "^0.25.0",

test/definitions/plugins.test.js

@@ -60,9 +60,9 @@ test('The "prepare" plugin, if defined, must be a single or an array of plugins
 test('The "publish" plugin is mandatory, and must be a single or an array of plugins definition', t => {
   t.false(plugins.publish.config.validator({}));
   t.false(plugins.publish.config.validator({path: null}));
-  t.false(plugins.publish.config.validator());
 
   t.true(plugins.publish.config.validator({path: 'plugin-path.js'}));
+  t.true(plugins.publish.config.validator());
   t.true(plugins.publish.config.validator('plugin-path.js'));
   t.true(plugins.publish.config.validator(() => {}));
   t.true(plugins.publish.config.validator([{path: 'plugin-path.js'}, 'plugin-path.js', () => {}]));