Enable import.meta by default in @babel/parser (#11406)

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

@@ -1227,8 +1227,6 @@ export default class ExpressionParser extends LValParser {
     this.expect(tt.dot);
 
     if (this.isContextual("meta")) {
-      this.expectPlugin("importMeta");
-
       if (!this.inModule) {
         this.raiseWithData(
           id.start,
@@ -1237,8 +1235,6 @@ export default class ExpressionParser extends LValParser {
         );
       }
       this.sawUnambiguousESM = true;
-    } else if (!this.hasPlugin("importMeta")) {
-      this.raise(id.start, Errors.ImportCallArityLtOne);
     }
 
     return this.parseMetaProperty(node, id, "meta");

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

@@ -68,7 +68,6 @@ export const Errors = Object.freeze({
   ImportCallArgumentTrailingComma:
     "Trailing comma is disallowed inside import(...) arguments",
   ImportCallArity: "import() requires exactly one argument",
-  ImportCallArityLtOne: "Dynamic imports require a parameter: import('a.js')",
   ImportCallNotNewExpression: "Cannot use new with import(...)",
   ImportCallSpreadArgument: "... is not allowed in import()",
   ImportMetaOutsideModule: `import.meta may appear only with 'sourceType: "module"'`,