throw if first argument is not cypress config

Author: chrisbreiding

index.js

@@ -43,6 +43,12 @@ const defaults = {
 module.exports = (config, userOptions = {}) => {
   log('received user options', userOptions)
 
+  if (!config || typeof config.isTextTerminal !== 'boolean') {
+    throw new Error(`Cypress Browserify Preprocessor must be called with the Cypress config as its first argument. You passed: ${JSON.stringify(config, null, 2)}`)
+  }
+
+  const options = Object.assign({}, defaults, userOptions)
+
   return (filePath, util) => {
     log('get', filePath)
 

test/index_spec.js

@@ -66,6 +66,10 @@ describe('browserify preprocessor', function () {
     it('receives user options and returns a preprocessor function', function () {
       expect(preprocessor(this.config, this.userOptions)).to.be.a('function')
     })
+
+    it('throws error if config is not the first argument', function () {
+      expect(preprocessor).to.throw('must be called with the Cypress config')
+    })
   })
 
   describe('preprocessor function', function () {