Add more typescript option validation

.vscode/settings.json

@@ -1,6 +1,7 @@
 {
   "eslint.enable": true,
-  "editor.formatOnSave": true,
   // enable for eslint-plugin json-format
-  "eslint.validate": ["json"],
+  "eslint.validate": [
+    "json"
+  ],
 }

index.js

@@ -2,14 +2,22 @@
 
 const path = require('path')
 const Promise = require('bluebird')
-const fs = require('./lib/fs')
+const fs = require('fs-extra')
 
 const cloneDeep = require('lodash.clonedeep')
 const browserify = require('browserify')
 const watchify = require('watchify')
 
 const debug = require('debug')('cypress:browserify')
 
+const typescriptExtensionRegex = /\.tsx?$/
+const errorTypes = {
+  TYPESCRIPT_AND_TSIFY: 'TYPESCRIPT_AND_TSIFY',
+  TYPESCRIPT_NONEXISTENT: 'TYPESCRIPT_NONEXISTENT',
+  TYPESCRIPT_NOT_CONFIGURED: 'TYPESCRIPT_NOT_CONFIGURED',
+  TYPESCRIPT_NOT_STRING: 'TYPESCRIPT_NOT_STRING',
+}
+
 const bundles = {}
 
 // by default, we transform JavaScript (including some proposal features),
@@ -60,7 +68,17 @@ const defaultOptions = {
   },
 }
 
-const getBrowserifyOptions = (entry, userBrowserifyOptions = {}, typescriptPath = null) => {
+const throwError = ({ message, type }) => {
+  const prefix = 'Error running @cypress/browserify-preprocessor:\n\n'
+
+  const err = new Error(`${prefix}${message}`)
+
+  if (type) err.type = type
+
+  throw err
+}
+
+const getBrowserifyOptions = async (entry, userBrowserifyOptions = {}, typescriptPath = null) => {
   let browserifyOptions = cloneDeep(defaultOptions.browserifyOptions)
 
   // allow user to override default options
@@ -82,22 +100,38 @@ const getBrowserifyOptions = (entry, userBrowserifyOptions = {}, typescriptPath
   })
 
   if (typescriptPath) {
+    if (typeof typescriptPath !== 'string') {
+      throwError({
+        type: errorTypes.TYPESCRIPT_NOT_STRING,
+        message: `The 'typescript' option must be a string. You passed: ${typescriptPath}`,
+      })
+    }
+
+    const pathExists = await fs.pathExists(typescriptPath)
+
+    if (!pathExists) {
+      throwError({
+        type: errorTypes.TYPESCRIPT_NONEXISTENT,
+        message: `The 'typescript' option must be a valid path to your TypeScript installation. We could not find anything at the following path: ${typescriptPath}`,
+      })
+    }
+
     const transform = browserifyOptions.transform
     const hasTsifyTransform = transform.some(([name]) => name.includes('tsify'))
     const hastsifyPlugin = browserifyOptions.plugin.includes('tsify')
 
     if (hasTsifyTransform || hastsifyPlugin) {
       const type = hasTsifyTransform ? 'transform' : 'plugin'
 
-      throw new Error(`Error running @cypress/browserify-preprocessor:
-
-It looks like you passed the 'typescript' option and also specified a browserify ${type} for TypeScript. This may cause conflicts.
+      throwError({
+        type: errorTypes.TYPESCRIPT_AND_TSIFY,
+        message: `It looks like you passed the 'typescript' option and also specified a browserify ${type} for TypeScript. This may cause conflicts.
 
 Please do one of the following:
 
 1) Pass in the 'typescript' option and omit the browserify ${type} (Recommmended)
-2) Omit the 'typescript' option and continue to use your own browserify ${type}
-`)
+2) Omit the 'typescript' option and continue to use your own browserify ${type}`,
+      })
     }
 
     browserifyOptions.extensions.push('.ts', '.tsx')
@@ -135,7 +169,7 @@ const preprocessor = (options = {}) => {
   // when running in the GUI, it will likely get called multiple times
   // with the same filePath, as the user could re-run the tests, causing
   // the supported file and spec file to be requested again
-  return (file) => {
+  return async (file) => {
     const filePath = file.filePath
 
     debug('get:', filePath)
@@ -157,9 +191,18 @@ const preprocessor = (options = {}) => {
     debug('input:', filePath)
     debug('output:', outputPath)
 
-    const browserifyOptions = getBrowserifyOptions(filePath, options.browserifyOptions, options.typescript)
+    const browserifyOptions = await getBrowserifyOptions(filePath, options.browserifyOptions, options.typescript)
     const watchifyOptions = Object.assign({}, defaultOptions.watchifyOptions, options.watchifyOptions)
 
+    if (!options.typescript && typescriptExtensionRegex.test(filePath)) {
+      throwError({
+        type: errorTypes.TYPESCRIPT_NOT_CONFIGURED,
+        message: `You are attempting to preprocess a TypeScript file, but do not have TypeScript configured. Pass the 'typescript' option to enable TypeScript support.
+
+The file: ${filePath}`,
+      })
+    }
+
     const bundler = browserify(browserifyOptions)
 
     if (file.shouldWatch) {
@@ -227,7 +270,7 @@ const preprocessor = (options = {}) => {
     })
 
     const bundlePromise = fs
-    .ensureDirAsync(path.dirname(outputPath))
+    .ensureDir(path.dirname(outputPath))
     .then(bundle)
 
     // cache the bundle promise, so it can be returned if this function
@@ -253,6 +296,8 @@ const preprocessor = (options = {}) => {
 // provide a clone of the default options
 preprocessor.defaultOptions = JSON.parse(JSON.stringify(defaultOptions))
 
+preprocessor.errorTypes = errorTypes
+
 if (process.env.__TESTING__) {
   preprocessor.reset = () => {
     for (let filePath in bundles) {

package.json

@@ -33,7 +33,7 @@
     "coffeeify": "3.0.1",
     "coffeescript": "1.12.7",
     "debug": "4.1.1",
-    "fs-extra": "7.0.1",
+    "fs-extra": "9.0.0",
     "lodash.clonedeep": "4.5.0",
     "through2": "^2.0.0",
     "watchify": "3.11.1"
@@ -66,7 +66,7 @@
     "lib/*.js"
   ],
   "engines": {
-    "node": ">=6.5"
+    "node": ">=8"
   },
   "license": "MIT",
   "repository": {

test/e2e/e2e_spec.js

@@ -1,12 +1,12 @@
 const _ = require('lodash')
 const chai = require('chai')
+const fs = require('fs-extra')
 const path = require('path')
 const snapshot = require('snap-shot-it')
 const Bluebird = require('bluebird')
 
 process.env.__TESTING__ = true
 
-const fs = require('../../lib/fs')
 const preprocessor = require('../../index')
 
 /* eslint-disable-next-line no-unused-vars */
@@ -49,7 +49,7 @@ const verifySourceContents = ({ sources, sourcesContent }) => {
   const zippedArrays = _.zip(sources, sourcesContent)
 
   return Bluebird.map(zippedArrays, ([sourcePath, sourceContent]) => {
-    return fs.readFileAsync(sourcePath, 'utf8')
+    return fs.readFile(sourcePath, 'utf8')
     .then((str) => {
       expect(str).to.eq(sourceContent)
     })