Skip all prerequisite checks when using --no-publish

Follow-up to #226

index.js

@@ -48,6 +48,7 @@ module.exports = (input, opts) => {
 	const tasks = new Listr([
 		{
 			title: 'Prerequisite check',
+			enabled: () => runPublish,
 			task: () => prerequisiteTasks(input, pkg, opts)
 		},
 		{

lib/prerequisite.js

@@ -12,15 +12,15 @@ module.exports = (input, pkg, opts) => {
 	const tasks = [
 		{
 			title: 'Ping npm registry',
-			skip: () => pkg.private || isExternalRegistry || !opts.publish,
+			skip: () => pkg.private || isExternalRegistry,
 			task: () => pTimeout(execa.stdout('npm', ['ping'])
 				.catch(() => {
 					throw new Error('Connection to npm registry failed');
 				}), 15000, 'Connection to npm registry timed out')
 		},
 		{
 			title: 'Verify user is authenticated',
-			skip: () => process.env.NODE_ENV === 'test' || pkg.private || isExternalRegistry || !opts.publish,
+			skip: () => process.env.NODE_ENV === 'test' || pkg.private || isExternalRegistry,
 			task: () => execa.stdout('npm', ['whoami'])
 				.catch(err => {
 					throw new Error(/ENEEDAUTH/.test(err.stderr) ?
@@ -61,7 +61,6 @@ module.exports = (input, pkg, opts) => {
 		},
 		{
 			title: 'Check for pre-release version',
-			enabled: () => opts.publish,
 			task: () => {
 				if (!pkg.private && version.isPrereleaseVersion(newVersion) && !opts.tag) {
 					throw new Error('You must specify a dist-tag using --tag when publishing a pre-release version. This prevents accidentally tagging unstable versions as "latest". https://docs.npmjs.com/cli/dist-tag');
@@ -70,7 +69,7 @@ module.exports = (input, pkg, opts) => {
 		},
 		{
 			title: 'Check npm version',
-			skip: () => version.isVersionLower('6.0.0', process.version) || !opts.publish,
+			skip: () => version.isVersionLower('6.0.0', process.version),
 			task: () => execa.stdout('npm', ['version', '--json']).then(json => {
 				const versions = JSON.parse(json);
 				if (!version.satisfies(versions.npm, '>=2.15.8 <3.0.0 || >=3.10.1')) {