There are two examples of a text input with initial value of "Hello!" on this page, a controlled and an uncontrolled. The explanation for the uncontrolled version mistakenly says it works much like the earlier "uncontrolled" example, but the earlier example was the controlled version.
* fix conor
* one fewer jonathan
* nakazye
* Third9 & translucens
* zjjw
* rebase on master to pick up recent changes
* rebase
* shogunsea
* couple names for mailmap
* iawia002
* rebase
* terry3, speedskater
* rebase, handle duplicate mark
* more
1) If it is a native Symbol
2) If it is spec-compliant
3) Try to match non-spec compliant polyfill by a instanceof check on Symbol if it exists in the global namespace
Most ES6 polyfills will add support by implementing `Symbol` as a
function. This causes `typeof` to return `function` rather than `symbol`
for polyfilled clients.
This PR is the first in a series of pull requests split from the new `ReactPerf` implementation in #6046.
Here, we introduce a new module called `ReactDebugInstanceMap`. It will be used in `__DEV__` and, when the `__PROFILE__` gate is added, in the `__PROFILE__` builds. It will *not* be used in the production builds.
This module acts as a mapping between “debug IDs” (a new concept) and the internal instances. Not to be confused with the existing `ReactInstanceMap` that maps internal instances to public instances.
What are the “debug IDs” and why do we need them? Both the new `ReactPerf` and other consumers of the devtool API, such as React DevTools, need access to some data from the internal instances, such as the instance type display name, current props and children, and so on. Right now we let such tools access internal instances directly but this hurts our ability to refactor their implementations and burdens React DevTools with undesired implementation details such as having to support React ART in a special way.[1]
The purpose of adding `ReactDebugInstanceMap` is to only expose “debug IDs” instead of the internal instances to any devtools. In a future RP, whenever there is an event such as mounting, updating, or unmounting a component, we will emit an event in `ReactDebugTool` with the debug ID of the instance. We will also add an introspection API that lets the consumer pass an ID and get the information about the current children, props, state, display name, and so on, without exposing the internal instances.
`ReactDebugInstanceMap` has a concept of “registering” an instance. We plan to add the hooks that register an instance as soon as it is created, and unregister it during unmounting. It will only be possible to read information about the instance while it is still registered. If we add support for reparenting, we should be able to move the (un)registration code to different places in the component lifecycle without changing this code. The currently registered instances are held in the `registeredInstancesByIDs` dictionary.
There is also a reverse lookup dictionary called `allInstancesToIDs` which maps instances back to their IDs. It is implemented as a `WeakMap` so the keys are stable and we’re not holding onto the unregistered instances. If we’re not happy with `WeakMap`, one possible alternative would be to add a new field called `_debugID` to all the internal instances, but we don’t want to do this in production. Using `WeakMap` seems like a simpler solution here (and stable IDs are a nice bonus). This, however, means that the `__DEV__` (and the future `__PROFILE__`) builds will only work in browsers that support our usage of `WeakMap`.
[1]: https://github.com/facebook/react-devtools/blob/577ec9b8d994fd26d76feb20a1993a96558b7745/backend/getData.js
We move any spies on `console.error()` from `beforeEach()` to the individual `it()` tests. This means that if a new test is introduced in these suites, it does not ignore warnings by default, but fails on any unexpected warning, which is Jest's default behavior.
We also change a few old instances of direct `console.error = jest.genMockFn()` assignment to use `spyOn()` for consistency with the rest of the tests.
Sebastian Markbage
Paul O’Shannessy
Jim
Michael Terry
Ivan Vergiliev
Sam Balana
Raito Bezarius
Dan Abramov
Matthew Herbst
Sam Balana
cbrwizard