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ReactFiberDevToolsHook.js
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ReactFiberDevToolsHook.js
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/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @flow
*/
import type {Fiber} from './ReactFiber';
import type {FiberRoot} from './ReactFiberRoot';
import warningWithoutStack from 'shared/warningWithoutStack';
declare var __REACT_DEVTOOLS_GLOBAL_HOOK__: Object | void;
let onCommitFiberRoot = null;
let onCommitFiberUnmount = null;
let shouldSuspendFiber = function() {
return false;
};
let hasLoggedError = false;
function catchErrors(fn) {
return function(arg) {
try {
return fn(arg);
} catch (err) {
if (__DEV__ && !hasLoggedError) {
hasLoggedError = true;
warningWithoutStack(
false,
'React DevTools encountered an error: %s',
err,
);
}
}
};
}
export const isDevToolsPresent =
typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ !== 'undefined';
export function injectInternals(internals: Object): boolean {
if (typeof __REACT_DEVTOOLS_GLOBAL_HOOK__ === 'undefined') {
// No DevTools
return false;
}
const hook = __REACT_DEVTOOLS_GLOBAL_HOOK__;
if (hook.isDisabled) {
// This isn't a real property on the hook, but it can be set to opt out
// of DevTools integration and associated warnings and logs.
// https://github.com/facebook/react/issues/3877
return true;
}
if (!hook.supportsFiber) {
if (__DEV__) {
warningWithoutStack(
false,
'The installed version of React DevTools is too old and will not work ' +
'with the current version of React. Please update React DevTools. ' +
'https://fb.me/react-devtools',
);
}
// DevTools exists, even though it doesn't support Fiber.
return true;
}
try {
const rendererID = hook.inject(internals);
// We have successfully injected, so now it is safe to set up hooks.
onCommitFiberRoot = catchErrors(root =>
hook.onCommitFiberRoot(rendererID, root),
);
onCommitFiberUnmount = catchErrors(fiber =>
hook.onCommitFiberUnmount(rendererID, fiber),
);
if (__DEV__) {
if (hook.shouldSuspendFiber) {
shouldSuspendFiber = catchErrors(fiber =>
hook.shouldSuspendFiber(rendererID, fiber),
);
}
}
} catch (err) {
// Catch all errors because it is unsafe to throw during initialization.
if (__DEV__) {
warningWithoutStack(
false,
'React DevTools encountered an error: %s.',
err,
);
}
}
// DevTools exists
return true;
}
export function onCommitRoot(root: FiberRoot) {
if (typeof onCommitFiberRoot === 'function') {
onCommitFiberRoot(root);
}
}
export function onCommitUnmount(fiber: Fiber) {
if (typeof onCommitFiberUnmount === 'function') {
onCommitFiberUnmount(fiber);
}
}
export function shouldSuspend(fiber: Fiber) {
return shouldSuspendFiber(fiber);
}