fix: Remove default esModuleInterop option from ts-node and preprocessor

.eslintignore

@@ -26,7 +26,7 @@ packages/server/lib/scaffold/plugins/index.js
 packages/server/lib/scaffold/support/index.js
 packages/server/lib/scaffold/support/commands.js
 packages/server/test/support/fixtures/projects/e2e/cypress/integration/stdout_exit_early_failing_spec.js
-packages/server/test/support/fixtures/projects/e2e/cypress/integration/typescript_failing_spec.ts
+packages/server/test/support/fixtures/projects/e2e/cypress/integration/typescript_syntax_error_spec.ts
 
 **/.projects
 **/*.d.ts

packages/server/__snapshots__/1_typescript_support_spec.ts.js → packages/server/__snapshots__/1_typescript_spec_support_spec.ts.js

@@ -1,4 +1,4 @@
-exports['e2e typescript spec passes 1'] = `
+exports['e2e typescript in spec and support file spec passes 1'] = `
 
 ====================================================================================================
 
@@ -62,7 +62,7 @@ exports['e2e typescript spec passes 1'] = `
 
 `
 
-exports['e2e typescript spec fails 1'] = `
+exports['e2e typescript in spec and support file spec fails with syntax error 1'] = `
 
 ====================================================================================================
 
@@ -71,23 +71,23 @@ exports['e2e typescript spec fails 1'] = `
   ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
   │ Cypress:    1.2.3                                                                              │
   │ Browser:    FooBrowser 88                                                                      │
-  │ Specs:      1 found (typescript_failing_spec.ts)                                               │
-  │ Searched:   cypress/integration/typescript_failing_spec.ts                                     │
+  │ Specs:      1 found (typescript_syntax_error_spec.ts)                                          │
+  │ Searched:   cypress/integration/typescript_syntax_error_spec.ts                                │
   └────────────────────────────────────────────────────────────────────────────────────────────────┘
 
 
 ────────────────────────────────────────────────────────────────────────────────────────────────────
 
-  Running:  typescript_failing_spec.ts                                                      (1 of 1)
+  Running:  typescript_syntax_error_spec.ts                                                 (1 of 1)
 
 Oops...we found an error preparing this test file:
 
-  /foo/bar/.projects/e2e/cypress/integration/typescript_failing_spec.ts
+  /foo/bar/.projects/e2e/cypress/integration/typescript_syntax_error_spec.ts
 
 The error was:
 
 Error: Webpack Compilation Error
-./cypress/integration/typescript_failing_spec.tsXX:XX
+./cypress/integration/typescript_syntax_error_spec.tsXX:XX
 Module parse failed: Unexpected token (4:19)
 File was processed with these loaders:
  * ../../../../node_modules/@cypress/webpack-batteries-included-preprocessor/node_modules/ts-loader/index.js
@@ -115,14 +115,15 @@ Fix the error in your code and re-run your tests.
   │ Screenshots:  0                                                                                │
   │ Video:        true                                                                             │
   │ Duration:     X seconds                                                                        │
-  │ Spec Ran:     typescript_failing_spec.ts                                                       │
+  │ Spec Ran:     typescript_syntax_error_spec.ts                                                  │
   └────────────────────────────────────────────────────────────────────────────────────────────────┘
 
 
   (Video)
 
   -  Started processing:  Compressing to 32 CRF                                                     
-  -  Finished processing: /XXX/XXX/XXX/cypress/videos/typescript_failing_spec.ts.mp4      (X second)
+  -  Finished processing: /XXX/XXX/XXX/cypress/videos/typescript_syntax_error_spec.ts     (X second)
+                          .mp4                                                                      
 
 
 ====================================================================================================
@@ -132,14 +133,14 @@ Fix the error in your code and re-run your tests.
 
        Spec                                              Tests  Passing  Failing  Pending  Skipped  
   ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
-  │ ✖  typescript_failing_spec.ts               XX:XX        -        -        1        -        - │
+  │ ✖  typescript_syntax_error_spec.ts          XX:XX        -        -        1        -        - │
   └────────────────────────────────────────────────────────────────────────────────────────────────┘
     ✖  1 of 1 failed (100%)                     XX:XX        -        -        1        -        -  
 
 
 `
 
-exports['e2e typescript project passes 1'] = `
+exports['e2e typescript in spec and support file project passes 1'] = `
 
 ====================================================================================================
 
@@ -227,20 +228,3 @@ exports['e2e typescript project passes 1'] = `
 
 
 `
-
-exports['typescript with tsconfig run'] = `
-  (Run Finished)
-
-
-       Spec                                              Tests  Passing  Failing  Pending  Skipped  
-  ┌────────────────────────────────────────────────────────────────────────────────────────────────┐
-  │ ✔  app_spec.ts                              XX:XX        1        1        -        -        - │
-  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
-  │ ✔  js-spec.js                               XX:XX        2        2        -        -        - │
-  ├────────────────────────────────────────────────────────────────────────────────────────────────┤
-  │ ✔  math.ts                                  XX:XX        -        -        -        -        - │
-  └────────────────────────────────────────────────────────────────────────────────────────────────┘
-    ✔  All specs passed!                        XX:XX        3        3        -        -        -  
-
-
-`

packages/server/lib/plugins/child/run_plugins.js

@@ -4,15 +4,13 @@
 const _ = require('lodash')
 const debug = require('debug')('cypress:server:plugins:child')
 const Promise = require('bluebird')
-const tsnode = require('ts-node')
-const resolve = require('resolve')
 
 const errors = require('../../errors')
 const preprocessor = require('./preprocessor')
 const task = require('./task')
 const util = require('../util')
 const validateEvent = require('./validate_event')
-const tsNodeOptions = require('../../util/ts-node-options')
+const { registerTsNode } = require('../../util/ts-node')
 
 const ARRAY_METHODS = ['concat', 'push', 'unshift', 'slice', 'pop', 'shift', 'slice', 'splice', 'filter', 'map', 'forEach', 'reduce', 'reverse', 'splice', 'includes']
 
@@ -183,21 +181,7 @@ module.exports = (ipc, pluginsFile, projectRoot) => {
   })
 
   if (!tsRegistered) {
-    try {
-      const tsPath = resolve.sync('typescript', {
-        basedir: projectRoot,
-      })
-
-      const tsOptions = tsNodeOptions.getTsNodeOptions(tsPath)
-
-      debug('typescript path: %s', tsPath)
-      debug('registering plugins TS with options %o', tsOptions)
-
-      tsnode.register(tsOptions)
-    } catch (e) {
-      debug(`typescript doesn't exist. ts-node setup failed.`)
-      debug('error message: %s', e.message)
-    }
+    registerTsNode(projectRoot)
 
     // ensure typescript is only registered once
     tsRegistered = true

packages/server/lib/project.js

@@ -6,8 +6,6 @@ const Promise = require('bluebird')
 const commitInfo = require('@cypress/commit-info')
 const la = require('lazy-ass')
 const check = require('check-more-types')
-const tsnode = require('ts-node')
-const resolve = require('resolve')
 const scaffoldDebug = require('debug')('cypress:server:scaffold')
 const debug = require('debug')('cypress:server:project')
 const cwd = require('./cwd')
@@ -31,7 +29,7 @@ const keys = require('./util/keys')
 const settings = require('./util/settings')
 const specsUtil = require('./util/specs')
 const { escapeFilenameInUrl } = require('./util/escape_filename')
-const tsNodeOptions = require('./util/ts-node-options')
+const { registerTsNode } = require('./util/ts-node')
 
 const localCwd = cwd()
 
@@ -103,21 +101,7 @@ class Project extends EE {
         return scaffold.plugins(path.dirname(cfg.pluginsFile), cfg)
       }
     }).then((cfg) => {
-      try {
-        const tsPath = resolve.sync('typescript', {
-          basedir: this.projectRoot,
-        })
-
-        const tsOptions = tsNodeOptions.getTsNodeOptions(tsPath)
-
-        debug('typescript path: %s', tsPath)
-        debug('registering project TS with options %o', tsOptions)
-
-        tsnode.register(tsOptions)
-      } catch (e) {
-        debug(`typescript doesn't exist. ts-node setup failed.`)
-        debug('error message %s', e.message)
-      }
+      registerTsNode(this.projectRoot)
 
       return cfg
     }).then((cfg) => {

packages/server/lib/util/ts-node.js

@@ -0,0 +1,34 @@
+const debug = require('debug')('cypress:server:ts-node')
+const tsnode = require('ts-node')
+const resolve = require('resolve')
+
+const getTsNodeOptions = (tsPath) => {
+  return {
+    compiler: tsPath, // use the user's installed typescript
+    compilerOptions: {
+      module: 'CommonJS',
+    },
+    transpileOnly: true, // transpile only (no type-check) for speed
+  }
+}
+
+const registerTsNode = (projectRoot) => {
+  try {
+    const tsPath = resolve.sync('typescript', {
+      basedir: projectRoot,
+    })
+    const tsOptions = getTsNodeOptions(tsPath)
+
+    debug('typescript path: %s', tsPath)
+    debug('registering project TS with options %o', tsOptions)
+
+    tsnode.register(tsOptions)
+  } catch (err) {
+    debug(`typescript doesn't exist. ts-node setup failed.`)
+    debug('error message: %s', err.message)
+  }
+}
+
+module.exports = {
+  registerTsNode,
+}

packages/server/test/e2e/1_typescript_plugins_spec.ts

@@ -0,0 +1,26 @@
+import e2e from '../support/helpers/e2e'
+import Fixtures from '../support/helpers/fixtures'
+
+describe('e2e typescript in plugins file', function () {
+  e2e.setup()
+
+  it('handles tsconfig with module other than commonjs', function () {
+    return e2e.exec(this, {
+      project: Fixtures.projectPath('ts-proj-with-module-esnext'),
+    })
+  })
+
+  // https://github.com/cypress-io/cypress/issues/7575
+  it('defaults to esModuleInterop: false', function () {
+    return e2e.exec(this, {
+      project: Fixtures.projectPath('ts-proj'),
+    })
+  })
+
+  // https://github.com/cypress-io/cypress/issues/7575
+  it('allows esModuleInterop to be overridden with true via tsconfig.json', function () {
+    return e2e.exec(this, {
+      project: Fixtures.projectPath('ts-proj-esmoduleinterop-true'),
+    })
+  })
+})

packages/server/test/e2e/1_typescript_support_spec.ts → packages/server/test/e2e/1_typescript_spec_support_spec.ts

@@ -1,9 +1,7 @@
-import snapshot from 'snap-shot-it'
-
 import e2e from '../support/helpers/e2e'
 import Fixtures from '../support/helpers/fixtures'
 
-describe('e2e typescript', function () {
+describe('e2e typescript in spec and support file', function () {
   e2e.setup()
 
   it('spec passes', function () {
@@ -13,9 +11,9 @@ describe('e2e typescript', function () {
     })
   })
 
-  it('spec fails', function () {
+  it('spec fails with syntax error', function () {
     return e2e.exec(this, {
-      spec: 'typescript_failing_spec.ts',
+      spec: 'typescript_syntax_error_spec.ts',
       snapshot: true,
       expectedExitCode: 1,
       onStdout: e2e.normalizeWebpackErrors,
@@ -36,19 +34,4 @@ describe('e2e typescript', function () {
       project: Fixtures.projectPath('ts-proj-with-paths'),
     })
   })
-
-  it('handles tsconfig with module other than commonjs', function () {
-    const projPath = Fixtures.projectPath('ts-proj-with-own-tsconfig')
-
-    return e2e.exec(this, {
-      project: projPath,
-      config: {
-        video: false,
-      },
-    }).then((result) => {
-      const runSummary = e2e.leaveRunFinishedTable(e2e.normalizeStdout(result.stdout))
-
-      snapshot('typescript with tsconfig run', runSummary)
-    })
-  })
 })

packages/server/test/support/fixtures/projects/ts-proj-esmoduleinterop-true/cypress.json

@@ -0,0 +1,3 @@
+{
+  "supportFile": false
+}

packages/server/test/support/fixtures/projects/ts-proj-esmoduleinterop-true/cypress/integration/passing_spec.ts

@@ -0,0 +1,3 @@
+it('passes', () => {
+  expect(true).to.be.true
+})

packages/server/test/support/fixtures/projects/ts-proj-esmoduleinterop-true/cypress/plugins/commonjs-export.js

@@ -0,0 +1,3 @@
+exports.export1 = 'export1'
+
+exports.export2 = 'export2'

packages/server/test/support/fixtures/projects/ts-proj-esmoduleinterop-true/cypress/plugins/index.ts

@@ -0,0 +1,12 @@
+/// <reference types="cypress" />
+
+import commonjsExports from './commonjs-export'
+
+if (commonjsExports.export1 !== 'export1' || commonjsExports.export2 !== 'export2') {
+  throw new Error('Imported values do not match exported values')
+}
+
+// Default Cypress plugin function
+export default (on: Cypress.PluginEvents, config: Cypress.PluginConfigOptions) => {
+
+}

packages/server/test/support/fixtures/projects/ts-proj-esmoduleinterop-true/tsconfig.json

@@ -0,0 +1,5 @@
+{
+  "compilerOptions": {
+    "esModuleInterop": true
+  }
+}

packages/server/test/support/fixtures/projects/ts-proj-with-module-esnext/cypress.json

@@ -0,0 +1,3 @@
+{
+  "supportFolder": false
+}

packages/server/test/support/fixtures/projects/ts-proj-with-module-esnext/cypress/integration/uses_cy_task_in_ts_plugins_file_spec.js

@@ -0,0 +1,5 @@
+describe('uses task that is in typescript plugins file', () => {
+  it('calls task', () => {
+    cy.task('hello', 'TS').should('equal', 'Hello, TS!')
+  })
+})

packages/server/test/support/fixtures/projects/ts-proj-with-module-esnext/cypress/plugins/greeting.ts

@@ -0,0 +1,3 @@
+export const asyncGreeting = async (greeting: string) => {
+  return Promise.resolve(`Hello, ${greeting}!`)
+}