feat: support custom node version based on engines

package.json

@@ -77,6 +77,7 @@
     "rollup-plugin-replace": "^2.0.0",
     "rollup-plugin-size-snapshot": "^0.6.1",
     "rollup-plugin-terser": "^1.0.1",
+    "semver": "^5.5.1",
     "which": "^1.3.0",
     "yargs-parser": "^10.0.0"
   },

src/config/babelrc.js

@@ -1,6 +1,7 @@
 const browserslist = require('browserslist')
+const semver = require('semver')
 
-const {ifAnyDep, parseEnv, appDirectory} = require('../utils')
+const {ifAnyDep, parseEnv, appDirectory, pkg} = require('../utils')
 
 const isTest = (process.env.BABEL_ENV || process.env.NODE_ENV) === 'test'
 const isPreact = parseEnv('BUILD_PREACT', false)
@@ -24,7 +25,7 @@ const envTargets = isTest
   ? {node: 'current'}
   : isWebpack || isRollup
     ? {browsers: browsersConfig}
-    : {node: '4.5'}
+    : {node: getNodeVersion(pkg)}
 const envOptions = {modules: false, loose: true, targets: envTargets}
 
 module.exports = () => ({
@@ -60,3 +61,18 @@ module.exports = () => ({
       : require.resolve('@babel/plugin-transform-modules-commonjs'),
   ].filter(Boolean),
 })
+
+function getNodeVersion({engines: {node: nodeVersion = '8'} = {}}) {
+  const oldestVersion = semver
+    .validRange(nodeVersion)
+    .replace(/[>=<|]/g, ' ')
+    .split(' ')
+    .filter(Boolean)
+    .sort(semver.compare)[0]
+  if (!oldestVersion) {
+    throw new Error(
+      `Unable to determine the oldest version in the range in your package.json at engines.node: "${nodeVersion}". Please attempt to make it less ambiguous.`,
+    )
+  }
+  return oldestVersion
+}