[@babel/parser] Add "allowUndeclaredExports" option (#9864)

Ref: https://github.com/babel/notes/blob/master/2019/04/09.md#export-changes-in-scope-pr-break-meteor-issue
2019-06-30 11:16:05 +02:00
parent 77fd7cd4c4
commit ca67637da4
5 changed files with 116 additions and 1 deletions
--- a/packages/babel-parser/src/parser/statement.js
+++ b/packages/babel-parser/src/parser/statement.js
@@ -45,7 +45,11 @@ export default class StatementParser extends ExpressionParser {

    this.parseBlockBody(program, true, true, tt.eof);

-    if (this.inModule && this.scope.undefinedExports.size > 0) {
+    if (
+      this.inModule &&
+      !this.options.allowUndeclaredExports &&
+      this.scope.undefinedExports.size > 0
+    ) {
      for (const [name] of Array.from(this.scope.undefinedExports)) {
        const pos = this.scope.undefinedExports.get(name);
        // $FlowIssue