fix: properly parse export default from

packages/babel-parser/src/parser/statement.js

@@ -1857,10 +1857,23 @@ export default class StatementParser extends ExpressionParser {
     }
 
     const next = this.nextTokenStart();
-    return (
+    const hasFrom = this.isUnparsedContextual(next, "from");
+    if (
       this.input.charCodeAt(next) === charCodes.comma ||
-      this.isUnparsedContextual(next, "from")
-    );
+      (this.match(tt.name) && hasFrom)
+    ) {
+      return true;
+    }
+    // lookahead again when `export default from` is seen
+    if (this.match(tt._default) && hasFrom) {
+      const nextAfterFrom = this.input.charCodeAt(
+        this.nextTokenStartSince(next + 4),
+      );
+      return (
+        nextAfterFrom === charCodes.quotationMark ||
+        nextAfterFrom === charCodes.apostrophe
+      );
+    }
   }
 
   parseExportFrom(node: N.ExportNamedDeclaration, expect?: boolean): void {

packages/babel-parser/src/plugins/placeholders.js

@@ -251,6 +251,21 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       return super.parseExport(node);
     }
 
+    isExportDefaultSpecifier(): boolean {
+      if (this.match(tt._default)) {
+        const next = this.nextTokenStart();
+        if (this.isUnparsedContextual(next, "from")) {
+          if (
+            this.input.substr(this.nextTokenStartSince(next + 4), 2) ===
+            tt.placeholder.label
+          ) {
+            return true;
+          }
+        }
+      }
+      return super.isExportDefaultSpecifier();
+    }
+
     maybeParseExportDefaultSpecifier(node: N.Node): boolean {
       if (node.specifiers && node.specifiers.length > 0) {
         // "export %%NAME%%" has already been parsed by #parseExport.

packages/babel-parser/test/fixtures/esprima/es2015-export-declaration/export-default-from-as-identifier-2/input.js

@@ -0,0 +1 @@
+export default from (bar);

packages/babel-parser/test/fixtures/esprima/es2015-export-declaration/export-default-from-as-identifier-2/output.json

@@ -0,0 +1,33 @@
+{
+  "type": "File",
+  "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportDefaultDeclaration",
+        "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
+        "declaration": {
+          "type": "CallExpression",
+          "start":15,"end":25,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":25}},
+          "callee": {
+            "type": "Identifier",
+            "start":15,"end":19,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":19},"identifierName":"from"},
+            "name": "from"
+          },
+          "arguments": [
+            {
+              "type": "Identifier",
+              "start":21,"end":24,"loc":{"start":{"line":1,"column":21},"end":{"line":1,"column":24},"identifierName":"bar"},
+              "name": "bar"
+            }
+          ]
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/esprima/es2015-export-declaration/export-default-from-as-identifier-3/input.js

@@ -0,0 +1 @@
+export default from ?? 42;

packages/babel-parser/test/fixtures/esprima/es2015-export-declaration/export-default-from-as-identifier-3/output.json

@@ -0,0 +1,36 @@
+{
+  "type": "File",
+  "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportDefaultDeclaration",
+        "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
+        "declaration": {
+          "type": "LogicalExpression",
+          "start":15,"end":25,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":25}},
+          "left": {
+            "type": "Identifier",
+            "start":15,"end":19,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":19},"identifierName":"from"},
+            "name": "from"
+          },
+          "operator": "??",
+          "right": {
+            "type": "NumericLiteral",
+            "start":23,"end":25,"loc":{"start":{"line":1,"column":23},"end":{"line":1,"column":25}},
+            "extra": {
+              "rawValue": 42,
+              "raw": "42"
+            },
+            "value": 42
+          }
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/esprima/es2015-export-declaration/export-default-from-as-identifier/input.js

@@ -0,0 +1 @@
+export default from;

packages/babel-parser/test/fixtures/esprima/es2015-export-declaration/export-default-from-as-identifier/output.json

@@ -0,0 +1,22 @@
+{
+  "type": "File",
+  "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportDefaultDeclaration",
+        "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
+        "declaration": {
+          "type": "Identifier",
+          "start":15,"end":19,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":19},"identifierName":"from"},
+          "name": "from"
+        }
+      }
+    ],
+    "directives": []
+  }
+}

packages/babel-parser/test/fixtures/experimental/export-extensions/default-from/input.js

@@ -0,0 +1 @@
+export default from;

packages/babel-parser/test/fixtures/experimental/export-extensions/default-from/options.json

@@ -0,0 +1,4 @@
+{
+  "plugins": ["exportDefaultFrom"],
+  "sourceType": "module"
+}

packages/babel-parser/test/fixtures/experimental/export-extensions/default-from/output.json

@@ -0,0 +1,22 @@
+{
+  "type": "File",
+  "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
+  "program": {
+    "type": "Program",
+    "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
+    "sourceType": "module",
+    "interpreter": null,
+    "body": [
+      {
+        "type": "ExportDefaultDeclaration",
+        "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
+        "declaration": {
+          "type": "Identifier",
+          "start":15,"end":19,"loc":{"start":{"line":1,"column":15},"end":{"line":1,"column":19},"identifierName":"from"},
+          "name": "from"
+        }
+      }
+    ],
+    "directives": []
+  }
+}