Repository: facebook/react
File: packages/react-dom-bindings/src/client/ReactFiberConfigDOM.js (JavaScript)

Code before:
export type HostContextDev = {
  context: HostContextProd,
  ancestorInfo: AncestorInfoDev,
};
type HostContextProd = HostContextNamespace;
export type HostContext = HostContextDev | HostContextProd;
export type UpdatePayload = Array<mixed>;
export type ChildSet = void; // Unused
export type TimeoutHandle = TimeoutID;
export type NoTimeout = -1;
export type RendererInspectionConfig = $ReadOnly<{}>;

export type TransitionStatus = FormStatus;

type SelectionInformation = {
  focusedElem: null | HTMLElement,
  selectionRange: mixed,
};

const SUPPRESS_HYDRATION_WARNING = 'suppressHydrationWarning';

const SUSPENSE_START_DATA = '$';
const SUSPENSE_END_DATA = '/$';
const SUSPENSE_PENDING_START_DATA = '$?';
const SUSPENSE_FALLBACK_START_DATA = '$!';
const FORM_STATE_IS_MATCHING = '!F';
const FORM_STATE_IS_NOT_MATCHING = 'F';

const STYLE = 'style';

opaque type HostContextNamespace = 0 | 1 | 2;
export const HostContextNamespaceNone: HostContextNamespace = 0;
const HostContextNamespaceSvg: HostContextNamespace = 1;
const HostContextNamespaceMath: HostContextNamespace = 2;

let eventsEnabled: ?boolean = null;
let selectionInformation: null | SelectionInformation = null;

export * from 'react-reconciler/src/ReactFiberConfigWithNoPersistence';

function getOwnerDocumentFromRootContainer(
  rootContainerElement: Element | Document | DocumentFragment,
): Document {
  return rootContainerElement.nodeType === DOCUMENT_NODE
    ? (rootContainerElement: any)
    : rootContainerElement.ownerDocument;
}

export function getRootHostContext(
  rootContainerInstance: Container,
): HostContext {

Review comment (suggestion):
```suggestion
const FORM_STATE_IS_MATCHING = 'F!';
```

Code after:
export type HostContextDev = {
  context: HostContextProd,
  ancestorInfo: AncestorInfoDev,
};
type HostContextProd = HostContextNamespace;
export type HostContext = HostContextDev | HostContextProd;
export type UpdatePayload = Array<mixed>;
export type ChildSet = void; // Unused
export type TimeoutHandle = TimeoutID;
export type NoTimeout = -1;
export type RendererInspectionConfig = $ReadOnly<{}>;

export type TransitionStatus = FormStatus;

type SelectionInformation = {
  focusedElem: null | HTMLElement,
  selectionRange: mixed,
};

const SUPPRESS_HYDRATION_WARNING = 'suppressHydrationWarning';

const SUSPENSE_START_DATA = '$';
const SUSPENSE_END_DATA = '/$';
const SUSPENSE_PENDING_START_DATA = '$?';
const SUSPENSE_FALLBACK_START_DATA = '$!';
const FORM_STATE_IS_MATCHING = 'F!';
const FORM_STATE_IS_NOT_MATCHING = 'F';

const STYLE = 'style';

opaque type HostContextNamespace = 0 | 1 | 2;
export const HostContextNamespaceNone: HostContextNamespace = 0;
const HostContextNamespaceSvg: HostContextNamespace = 1;
const HostContextNamespaceMath: HostContextNamespace = 2;

let eventsEnabled: ?boolean = null;
let selectionInformation: null | SelectionInformation = null;

export * from 'react-reconciler/src/ReactFiberConfigWithNoPersistence';

function getOwnerDocumentFromRootContainer(
  rootContainerElement: Element | Document | DocumentFragment,
): Document {
  return rootContainerElement.nodeType === DOCUMENT_NODE
    ? (rootContainerElement: any)
    : rootContainerElement.ownerDocument;
}

export function getRootHostContext(
  rootContainerInstance: Container,
): HostContext {