Delete duplicate jsx() implementation (facebook#28258)

Not sure how this happened but there are two identical implementations
of the jsx and jsxDEV functions. One of them was unreachable. I deleted
that one.

Author: acdlite

packages/react/src/ReactElementProd.js

@@ -201,160 +201,6 @@ function ReactElement(type, key, ref, self, source, owner, props) {
   return element;
 }
 
-/**
- * https://github.com/reactjs/rfcs/pull/107
- * @param {*} type
- * @param {object} props
- * @param {string} key
- */
-export function jsx(type, config, maybeKey) {
-  let propName;
-
-  // Reserved names are extracted
-  const props = {};
-
-  let key = null;
-  let ref = null;
-
-  // Currently, key can be spread in as a prop. This causes a potential
-  // issue if key is also explicitly declared (ie. <div {...props} key="Hi" />
-  // or <div key="Hi" {...props} /> ). We want to deprecate key spread,
-  // but as an intermediary step, we will use jsxDEV for everything except
-  // <div {...props} key="Hi" />, because we aren't currently able to tell if
-  // key is explicitly declared to be undefined or not.
-  if (maybeKey !== undefined) {
-    if (__DEV__) {
-      checkKeyStringCoercion(maybeKey);
-    }
-    key = '' + maybeKey;
-  }
-
-  if (hasValidKey(config)) {
-    if (__DEV__) {
-      checkKeyStringCoercion(config.key);
-    }
-    key = '' + config.key;
-  }
-
-  if (hasValidRef(config)) {
-    ref = config.ref;
-  }
-
-  // Remaining properties are added to a new props object
-  for (propName in config) {
-    if (
-      hasOwnProperty.call(config, propName) &&
-      !RESERVED_PROPS.hasOwnProperty(propName)
-    ) {
-      props[propName] = config[propName];
-    }
-  }
-
-  // Resolve default props
-  if (type && type.defaultProps) {
-    const defaultProps = type.defaultProps;
-    for (propName in defaultProps) {
-      if (props[propName] === undefined) {
-        props[propName] = defaultProps[propName];
-      }
-    }
-  }
-
-  return ReactElement(
-    type,
-    key,
-    ref,
-    undefined,
-    undefined,
-    ReactCurrentOwner.current,
-    props,
-  );
-}
-
-/**
- * https://github.com/reactjs/rfcs/pull/107
- * @param {*} type
- * @param {object} props
- * @param {string} key
- */
-export function jsxDEV(type, config, maybeKey, source, self) {
-  let propName;
-
-  // Reserved names are extracted
-  const props = {};
-
-  let key = null;
-  let ref = null;
-
-  // Currently, key can be spread in as a prop. This causes a potential
-  // issue if key is also explicitly declared (ie. <div {...props} key="Hi" />
-  // or <div key="Hi" {...props} /> ). We want to deprecate key spread,
-  // but as an intermediary step, we will use jsxDEV for everything except
-  // <div {...props} key="Hi" />, because we aren't currently able to tell if
-  // key is explicitly declared to be undefined or not.
-  if (maybeKey !== undefined) {
-    if (__DEV__) {
-      checkKeyStringCoercion(maybeKey);
-    }
-    key = '' + maybeKey;
-  }
-
-  if (hasValidKey(config)) {
-    if (__DEV__) {
-      checkKeyStringCoercion(config.key);
-    }
-    key = '' + config.key;
-  }
-
-  if (hasValidRef(config)) {
-    ref = config.ref;
-    warnIfStringRefCannotBeAutoConverted(config);
-  }
-
-  // Remaining properties are added to a new props object
-  for (propName in config) {
-    if (
-      hasOwnProperty.call(config, propName) &&
-      !RESERVED_PROPS.hasOwnProperty(propName)
-    ) {
-      props[propName] = config[propName];
-    }
-  }
-
-  // Resolve default props
-  if (type && type.defaultProps) {
-    const defaultProps = type.defaultProps;
-    for (propName in defaultProps) {
-      if (props[propName] === undefined) {
-        props[propName] = defaultProps[propName];
-      }
-    }
-  }
-
-  if (key || ref) {
-    const displayName =
-      typeof type === 'function'
-        ? type.displayName || type.name || 'Unknown'
-        : type;
-    if (key) {
-      defineKeyPropWarningGetter(props, displayName);
-    }
-    if (ref) {
-      defineRefPropWarningGetter(props, displayName);
-    }
-  }
-
-  return ReactElement(
-    type,
-    key,
-    ref,
-    self,
-    source,
-    ReactCurrentOwner.current,
-    props,
-  );
-}
-
 /**
  * Create and return a new ReactElement of the given type.
  * See https://reactjs.org/docs/react-api.html#createelement

packages/react/src/ReactElementValidator.js

@@ -25,12 +25,8 @@ import checkPropTypes from 'shared/checkPropTypes';
 import isArray from 'shared/isArray';
 
 import ReactCurrentOwner from './ReactCurrentOwner';
-import {
-  isValidElement,
-  createElement,
-  cloneElement,
-  jsxDEV,
-} from './ReactElementProd';
+import {isValidElement, createElement, cloneElement} from './ReactElementProd';
+import {jsxDEV} from './jsx/ReactJSXElement';
 import {setExtraStackFrame} from './ReactDebugCurrentFrame';
 import {describeUnknownElementTypeFrameInDEV} from 'shared/ReactComponentStackFrame';
 import hasOwnProperty from 'shared/hasOwnProperty';