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cypress-cli type for CypressRunResult::runs is incorrect (can be null/undefined) #6126

xdumaine opened this issue Jan 8, 2020 · 1 comment


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@xdumaine xdumaine commented Jan 8, 2020

Current behavior:

In the event that the browser fails to connect, the run promise resolves with results which has runs of null or undefined. (Which is likely a separate issue altogether. It should probably not resolve at all - it should reject).

However, the typings indicate that the type of runs is RunResult[] which doesn't match null

Desired behavior:

The type should indicate that runs can be undefined or null, or run() should not resolve on an error running the tests altogether.

Test code to reproduce

  1. Clone
  2. npm i && npm test

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@ddayguerrero ddayguerrero commented Jan 20, 2020

👋 Hey! While there might be work in progress, I'd be interested in helping and ultimately achieving a first time contribution for Cypress.

Following the instructions within the cypress-test-tiny fork, I've been able to reproduce the error with the following environment:

Cypress:    3.8.1
Browser:    Chrome 79

As previously mentioned and from my understanding, there are currently a couple of ways of solving this:

  1. Playing around with the CypressRunResult type interface to support null or undefined special types.
  2. Handling the rejected state upon invoking the promise.

Option 2 sounds like the long term solution. I think changes will be around the lines of however it seems like we would need to distinguish before:browser:launch and task events.

Can I help with with 2, with the short term solution 1, or with any other suggested solution?

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