fix: use includePrerelease flag when checking node version

The code stripping it out predates that flag even existing in node-semver

lib/cli-entry.js

@@ -29,7 +29,7 @@ module.exports = async (process, validateEngines) => {
   process.on('unhandledRejection', exitHandler)
 
   // It is now safe to log a warning if they are using a version of node that is not going to fail on syntax errors but is still unsupported and untested and might not work reliably. This is safe to use the logger now which we want since this will show up in the error log too.
-  if (!satisfies(validateEngines.node, validateEngines.engines)) {
+  if (!satisfies(validateEngines.node, validateEngines.engines, { includePrerelease: true })) {
     log.warn('cli', validateEngines.unsupportedMessage)
   }
 

lib/es6/validate-engines.js

@@ -9,7 +9,7 @@ const { engines: { node: engines }, version } = require('../../package.json')
 const npm = `v${version}`
 
 module.exports = (process, getCli) => {
-  const node = process.version.replace(/-.*$/, '')
+  const node = process.version
 
   /* eslint-disable-next-line max-len */
   const unsupportedMessage = `npm ${npm} does not support Node.js ${node}. This version of npm supports the following node versions: \`${engines}\`. You can find the latest version at https://nodejs.org/.`

test/lib/cli-entry.js

@@ -161,3 +161,13 @@ t.test('unsupported node version', async t => {
     /npm v.* does not support Node\.js 12\.6\.0\./
   )
 })
+
+t.test('node prerelease is supported inside engines', async t => {
+  const { cli, logs } = await cliMock(t, {
+    globals: {
+      'process.version': `${process.version}-pre.0`,
+    },
+  })
+  await cli(process)
+  t.notMatch(logs.warn[0], [])
+})