Restore default pragmas in preset-react for classic runtime (#11324)

packages/babel-plugin-transform-react-jsx/src/transform-classic.js

@@ -41,7 +41,7 @@ export default declare((api, options) => {
 
     post(state, pass) {
       state.callee = pass.get("jsxIdentifier")();
-      state.pure = PURE_ANNOTATION ?? !pass.get("pragmaSet");
+      state.pure = PURE_ANNOTATION ?? pass.get("pragma") === DEFAULT.pragma;
     },
 
     throwIfNamespace: THROW_IF_NAMESPACE,
@@ -74,6 +74,7 @@ export default declare((api, options) => {
       state.set("jsxIdentifier", createIdentifierParser(pragma));
       state.set("jsxFragIdentifier", createIdentifierParser(pragmaFrag));
       state.set("usedFragment", false);
+      state.set("pragma", pragma);
       state.set("pragmaSet", pragmaSet);
       state.set("pragmaFragSet", pragmaFragSet);
     },

packages/babel-preset-react/src/index.js

@@ -8,9 +8,9 @@ import transformReactJSXSelf from "@babel/plugin-transform-react-jsx-self";
 export default declare((api, opts) => {
   api.assertVersion(7);
 
+  let { pragma, pragmaFrag } = opts;
+
   const {
-    pragma,
-    pragmaFrag,
     pure,
     throwIfNamespace = true,
     useSpread,
@@ -18,6 +18,12 @@ export default declare((api, opts) => {
     importSource,
   } = opts;
 
+  // TODO: (Babel 8) Remove setting these defaults
+  if (runtime === "classic") {
+    pragma = pragma || "React.createElement";
+    pragmaFrag = pragmaFrag || "React.Fragment";
+  }
+
   // TODO: (Babel 8) Don't cast these options but validate it
   const development = !!opts.development;
   const useBuiltIns = !!opts.useBuiltIns;

packages/babel-preset-react/test/fixtures/preset-options/runtime-classic-pragma-no-frag/input.js

@@ -0,0 +1,3 @@
+/** @jsx jsx */
+
+const Foo = <></>;

packages/babel-preset-react/test/fixtures/preset-options/runtime-classic-pragma-no-frag/options.json

@@ -0,0 +1,3 @@
+{
+  "presets": ["react"]
+}

packages/babel-preset-react/test/fixtures/preset-options/runtime-classic-pragma-no-frag/output.js

@@ -0,0 +1,2 @@
+/** @jsx jsx */
+const Foo = jsx(React.Fragment, null);