fix: node 6 unhappy again...

.eslintrc.js

@@ -1,15 +1,15 @@
 module.exports = {
   env: {
     node: true,
-    es6: true,
   },
   extends: 'eslint:recommended',
   parserOptions: {
-    ecmaVersion: 6,
+    ecmaVersion: 5,
     sourceType: 'module',
     impliedStrict: true,
   },
   rules: {
+    'no-console': ['error', { allow: ['warn', 'error', 'log'] }],
     indent: ['error', 2],
     'linebreak-style': ['error', 'unix'],
     quotes: ['error', 'single'],

preprocessor.js

@@ -1,9 +1,9 @@
 console.warn(
   'ts-jest',
   '[deprecated]',
-  `Replace any occurrences of "ts-jest/dist/preprocessor.js" or ` +
-    ` "<rootDir>/node_modules/ts-jest/preprocessor.js"` +
-    ` in the 'transform' section of your Jest config with just "ts-jest".`,
+  'Replace any occurrences of "ts-jest/dist/preprocessor.js" or ' +
+    ' "<rootDir>/node_modules/ts-jest/preprocessor.js"' +
+    ' in the \'transform\' section of your Jest config with just "ts-jest".'
 )
 
 module.exports = require('./dist')

scripts/e2e.js

@@ -110,7 +110,7 @@ function setupE2e() {
     }
 
     if (!packagesOk) {
-      if (npm.can.ci) {
+      if (npm.can.ci()) {
         log(`  [template: ${name}]`, 'installing packages using "npm ci"')
         spawnSync('npm', ['ci'], { cwd: dir })
       } else {

scripts/lib/bundle.js

@@ -7,7 +7,7 @@ const { join } = require('path')
 // Except that on npm < 4.0.0 the prepare doesn't exists
 
 module.exports = function createBundle() {
-  if (!npm.can.prepare) {
+  if (!npm.can.prepare()) {
     logger.log('building ts-jest')
     npm.spawnSync(['-s', 'run', 'build'], { cwd: rootDir })
   }

scripts/lib/npm.js

@@ -1,32 +1,24 @@
-const { sync: spawnSync } = require('cross-spawn')
+const spawn = require('cross-spawn')
 const { satisfies } = require('semver')
 const memoize = require('lodash.memoize')
 
-const self = {}
-
-Object.defineProperties(self, {
-  version: {
-    get: memoize(() =>
-      self
-        .spawnSync(['-s', '--version'])
-        .stdout.toString()
-        .trim(),
-    ),
-  },
-  spawnSync: {
-    value(args, options = {}) {
-      return spawnSync('npm', args, options)
-    },
-  },
-  can: {
-    value: Object.defineProperties(
-      {},
-      {
-        ci: { get: memoize(() => satisfies(self.version, '>=5.7.0')) },
-        prepare: { get: memoize(() => satisfies(self.version, '>=5.7.0')) },
-      },
-    ),
-  },
+const version = memoize(() => {
+  return spawnSync(['-s', '--version'])
+    .stdout.toString()
+    .trim()
 })
 
-module.exports = self
+const spawnSync = (args, options = {}) => {
+  return spawn.sync('npm', args, options)
+}
+
+const can = {
+  ci: memoize(() => satisfies(version(), '>=5.7.0')),
+  prepare: memoize(() => satisfies(version(), '>=5.7.0')),
+}
+
+module.exports = {
+  version,
+  spawnSync,
+  can,
+}