TypeScript error when running Protractor test

Question

I have a small suite of Protractor tests. In with the tests, I have some page object classes that extend from a common base class. In my protractor config, I have:

specs: [
  './showcase/e2e/**/*.e2e-spec.ts'
]

If I run Protractor with this config, all the tests run. But, if I try to run a single test, I run into an error.

I'm trying to run a specific test with this command:

protractor --specs showcase/e2e/app/components/dropdown/dropdown.e2e-spec.ts

But then I get an error:

Error: TSError: ⨯ Unable to compile TypeScript
showcase/e2e/shared/components/dropdown/dropdown.po.ts (3,32): Property 'setPrototypeOf' does not exist on type 'ObjectConstructor'. (2339)

Here is the contents of dropdown.po.ts:

import { ExamplePage } from '../example.po';

export const COMPONENT_ID = 'dropdown';

export class DropdownPage extends ExamplePage {
  navigateTo() {
    this.navigateToComponentPage('dropdown');
  }
}

There's got to be something I'm missing. Any idea why I get this error when I try to run a single test case, but no error when I run everything? I'm stumped.

It looks like you are using ecma6 when running the entire suite, but when you are running a single test, its target is not what you intend — nilesh
– nilesh, Commented Feb 2, 2018 at 21:48

yong · Accepted Answer · 2018-02-03 02:28:47Z

1

You missed to specify protractor conf in command line:

protractor --specs showcase/e2e/app/components/dropdown/dropdown.e2e-spec.ts

Correct one should be like:

protractor conf.js --specs showcase/e2e/app/components/dropdown/dropdown.e2e-spec.ts

answered Feb 3, 2018 at 2:28

yong

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1 Comment

Joe Attardi Over a year ago

I just tried that, specifying my config file, unfortunately I got the same error.

Jack · Accepted Answer · 2018-02-05 08:41:22Z

0

You should run *.js files instead of direct *.ts. Please use tsc for compiling your typescript code to javascript before running tests.

answered Feb 5, 2018 at 8:41

Jack

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1 Comment

Joe Attardi Over a year ago

I don't think that's the problem. When I run all the tests together (which are all written in TypeScript), I don't get the error.

Joe Attardi · Accepted Answer · 2018-02-05 15:08:33Z

0

I found the necessary fix.

In this case, I needed to add the following to tsconfig.json:

"lib": [
  "es2016",
  "dom"
]

answered Feb 5, 2018 at 15:08

Joe Attardi

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