fix(config): Simpilfy error proceesing. (#3345)

Fixes #3339

Author: johnjbarton

lib/config.js

@@ -353,19 +353,15 @@ function parseConfig (configFilePath, cliOptions) {
         configModule = configModule.default
       }
     } catch (e) {
-      if (e.code === 'MODULE_NOT_FOUND' && e.message.includes(configFilePath)) {
-        log.error(`File ${configFilePath} does not exist!`)
-      } else {
-        log.error('Invalid config file!\n  ' + e.stack)
-
-        const extension = path.extname(configFilePath)
-        if (extension === '.coffee' && !COFFEE_SCRIPT_AVAILABLE) {
-          log.error('You need to install CoffeeScript.\n  npm install coffeescript --save-dev')
-        } else if (extension === '.ls' && !LIVE_SCRIPT_AVAILABLE) {
-          log.error('You need to install LiveScript.\n  npm install LiveScript --save-dev')
-        } else if (extension === '.ts' && !TYPE_SCRIPT_AVAILABLE) {
-          log.error('You need to install TypeScript.\n  npm install typescript ts-node --save-dev')
-        }
+      log.error('Error in config file!\n  ' + e.stack || e)
+
+      const extension = path.extname(configFilePath)
+      if (extension === '.coffee' && !COFFEE_SCRIPT_AVAILABLE) {
+        log.error('You need to install CoffeeScript.\n  npm install coffeescript --save-dev')
+      } else if (extension === '.ls' && !LIVE_SCRIPT_AVAILABLE) {
+        log.error('You need to install LiveScript.\n  npm install LiveScript --save-dev')
+      } else if (extension === '.ts' && !TYPE_SCRIPT_AVAILABLE) {
+        log.error('You need to install TypeScript.\n  npm install typescript ts-node --save-dev')
       }
       return process.exit(1)
     }

test/unit/config.spec.js

@@ -118,7 +118,8 @@ describe('config', () => {
 
       expect(logSpy).to.have.been.called
       const event = logSpy.lastCall.args
-      expect(event).to.be.deep.equal(['File /conf/not-exist.js does not exist!'])
+      expect(event.toString().split('\n').slice(0, 2)).to.be.deep.equal(
+        [`Error in config file!`, `  Error: Cannot find module '/conf/not-exist.js'`])
       expect(mocks.process.exit).to.have.been.calledWith(1)
     })