Replacing the Node EventEmitter with Mitt caused more problems than
anticipated for end users due to the API differences and the amount of
people who relied on the EventEmitter API. In hindsight this clearly
should have been explored more and then released as a breaking v4.
This commit rolls us back to the built in Node EventEmitter library
which we can release to get everyone back on stable builds. We can then
consider our approach to migrating to Mitt and when we do do that we can
release it as a breaking change and properly document the migration
strategy and approach.
We deferred this initially because our Windows CI built wasn't stable
and so debugging this was hard. It's now much more stable so let's push
this back a month but at the same time I'll reach out to the Moz folks
as it should be easier to debug reliably now CI is stable on Windows.
* chore: migrate to Mitt as the EventEmitter
This commit moves us to using Mitt [1] for the event emitter in
Puppeteer. This removes our dependency to Node's EventEmitter which is
part of a larger stream of work to enable a Puppeteer-web version that
doesn't depend on Node.
There are no large breaking changes as we support the main methods that
EventEmitter had, but it also provides some methods that Puppeteer
didn't use. Technically end users could depend on this but it's
unlikely.
[1]: https://github.com/developit/mitt
It conflicts with an inbuilt TypeScript `Request` type so can cause
confusion when in TS land. Note: `Response.ts` and `Worker.ts` also
suffer from this; PRs to rename them are incoming.
This script generated an `index.d.ts` file but that file was never
commited to git nor included in Puppeteer when we ship. As of right now
people who want TS types can install from the DefinitelyTyped repo and
we are working on shipping types from Puppeteer itself.
Therefore this script is not adding any value and can be removed.
* Don't use expect within Promises (#5466)
If a call to expect fails within a Promise it will not
be resolved, and causing the test to crash.
The patch aligns the code similar to what is used by all
the other tests.
We should import them just like any other module. This commit makes that
change. It does not change any behaviours or the types themselves.
EXPECTED_PROTOCOL_DIFF as we're updating the structure of it.
* chore: fix invalid SSL assertion on Catalina
The error Chrome gives with an invalid cert changes between older Mac
versions and Catalina as detailed here:
https://support.google.com/chrome/thread/18125056?hl=en.
This PR changes Travis to run Catalina (and we think most devs run up to
date OS versions) so this fix ensures the test behaviour is consistent
locally and on Travis.
For those on older Mac versions I've left a comment by the tests to
hopefully save them debugging!
Co-authored-by: Mathias Bynens <mathias@qiwi.be>
The coverage utils depend on `src/api.ts` being up to date and pointing to the right modules. If they aren't, you would get a cryptic error on CI:
```
1) "before all" hook in "{root}":
TypeError: Cannot read property 'prototype' of undefined
at traceAPICoverage (test/coverage-utils.js:40:54)
at Context.before (test/coverage-utils.js:103:7)
2) "after all" hook in "{root}":
TypeError: Cannot read property 'stop' of undefined
at Context.after (test/mocha-utils.js:168:22)
```
This change logs a clearer error that highlights the missing class and exits, so it's much easier to realise what's gone wrong.
Ideally the coverage wouldn't need a hardcoded list of sources, but until then this will help spot this error in the future.
This corresponds to Chromium 83.0.4103.0.
This roll includes:
- Enable SameSiteByDefaultCookies and CookiesWithoutSameSiteMustBeSecure https://crrev.com/c/2122809
When this test was failing, it would cause no future tests to run. This
was because the `expect` call within the `page.on` callback would throw
an error, and that would trigger a unhandled promise rejection that
caused the test framework to stop.
The fundamental issue here is making `expect` calls within callbacks.
They are brittle due to the fact that they throw, and the test framework
won't catch it, but also because you have no guarantee that they will
run. If the callback is never executed you dont' know about it.
Although it's slightly more code, using a stub is the way to do this.
Not only can we assert that the stub was called, we can make synchronous
`expect` calls that Mocha will pick up properly if they fail.
Before this change, running the tests (and making it fail on purpose)
would cause all test execution to stop:
```
> puppeteer@3.0.4-post unit /Users/jacktfranklin/src/puppeteer
> mocha --config mocha-config/puppeteer-unit-tests.js
.(node:69580) UnhandledPromiseRejectionWarning: Error: expect(received).toBe(expected) // Object.is equality
Expected: "yes."
Received: ""
at Page.<anonymous> (/Users/jacktfranklin/src/puppeteer/test/dialog.spec.js:42:37)
[snip]
(node:69580) UnhandledPromiseRejectionWarning: Unhandled promise rejection ... [snip]
```
But with this change, the rest of the tests run:
```
> puppeteer@3.0.4-post unit /Users/jacktfranklin/src/puppeteer
> mocha --config mocha-config/puppeteer-unit-tests.js
Page.Events.Dialog
✓ should fire
1) should allow accepting prompts
✓ should dismiss the prompt
2 passing (2s)
1 failing
1) Page.Events.Dialog
should allow accepting prompts:
Error: expect(received).toBe(expected) // Object.is equality
Expected: "yes."
Received: ""
at Context.<anonymous> (test/dialog.spec.js:53:35)
at processTicksAndRejections (internal/process/task_queues.js:94:5)
```
This is much better because one failing test now doesn't stop the rest
of the test suite.
This probably isn't the only instance of this in the codebase so I
propose as we encounter them we fix them usng this commit as the
template.
We have some bug where some test runs will pass but then stall as Mocha
doesn't exit cleanly. This is proving very hard to track down (I've yet
to replicate it or find the test that causes it) and it doesn't happen
consistently.
The `exit` flag forces Mocha to hard exit. This will help with CI
stability. The flag only gets set on CI runs.
Sticking to a specific version of TS rather than a ^ version so we know
everyone is on the exact same version. Think that's preferable for such
an important dependency.
* chore: extract `BrowserRunner` into its own module
`src/Launcher.ts` is large and hard to work in. It has multiple objects
defined in it:
* ChromeLauncher
* FirefoxLauncher
* BrowserRunner
* Launcher
This change moves BrowserRunner into its own module. More refactorings
like this will follow but this is the first step.
* Warn when given unsupported product name.
Fixes#5844.
This change means when a user launches Puppeteer with a product name
that is not supported (which at the time of this commit means it's not
`firefox` or `chrome) we will warn them about it.
Decided on just a warning vs an error because the current behaviour is
that we fallback to launching Chrome and I don't think this warrants a
breaking change.
Now the first pass of migrating to TypeScript is complete I'm going
through the src files one by one to tidy up the public/private
interfaces.
Puppeteer used an underscore convention to denote privacy but violates
this in some places; we should be strict with TypeScript's `public` and
`private` keywords instead.
This means we'll get nice TS errors if you try to refer to a private
method/variable, and means when we swap to generating our TS docs the
tooling knows what method(s) are public and therefore need to be
documented vs private internals that don't.
* chore: Remove src/TaskQueue
The only place it's used is in `src/Page.ts` to have a chain of
screenshot promises. Rather than initialize a task queue in `Browser`
and pass it through a chain of constructors we instead move the class
into `src/Page` and define it inline.
In the future we might want to create a helpers folder to contain small
utilities like that (`src/Page.ts` is already far too large) but I'm
leaving that for a future PR.
`TaskQueue` isn't documented in `api.md` so I don't think this is a
breaking change.
I updated the type of `screenshot()` to return `Promise<string | Buffer
| void>` because if a promise rejects it's silently swallowed. I'd like
to change this behaviour but one step at a time. This type only had to
change as now we type the screenshot task queue correctly rather than
using `any` which then exposed the incorrect `screenshot()` types.
