Remove warning on whitespace in tables

Related to: remarkjs/react-markdown-576

lib/ast-to-react.js

@@ -102,6 +102,7 @@
 
 import React from 'react'
 import ReactIs from 'react-is'
+import {whitespace} from 'hast-util-whitespace'
 import {svg, find, hastToReact} from 'property-information'
 import {stringify as spaces} from 'space-separated-tokens'
 import {stringify as commas} from 'comma-separated-tokens'
@@ -130,12 +131,17 @@ export function childrenToReact(context, node) {
     if (child.type === 'element') {
       children.push(toReact(context, child, childIndex, node))
     } else if (child.type === 'text') {
-      // React does not permit whitespace text elements as children of table:
-      // cf. https://github.com/remarkjs/react-markdown/issues/576
+      // Currently, a warning is triggered by react for *any* white space in
+      // tables.
+      // So we drop it.
+      // See: <https://github.com/facebook/react/pull/7081>.
+      // See: <https://github.com/facebook/react/pull/7515>.
+      // See: <https://github.com/remarkjs/remark-react/issues/64>.
+      // See: <https://github.com/remarkjs/react-markdown/issues/576>.
       if (
         node.type !== 'element' ||
         !tableElements.has(node.tagName) ||
-        child.value !== '\n'
+        !whitespace(child)
       ) {
         children.push(child.value)
       }

package.json

@@ -82,6 +82,7 @@
     "@types/hast": "^2.0.0",
     "@types/unist": "^2.0.0",
     "comma-separated-tokens": "^2.0.0",
+    "hast-util-whitespace": "^2.0.0",
     "prop-types": "^15.0.0",
     "property-information": "^6.0.0",
     "react-is": "^17.0.0",