Enable top-level await parsing by default (#13387)

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

@@ -39,14 +39,12 @@ import {
   SCOPE_DIRECT_SUPER,
   SCOPE_FUNCTION,
   SCOPE_SUPER,
-  SCOPE_PROGRAM,
 } from "../util/scopeflags";
 import { ExpressionErrors } from "./util";
 import {
   PARAM_AWAIT,
   PARAM_IN,
   PARAM_RETURN,
-  PARAM,
   functionFlags,
 } from "../util/production-parameter";
 import {
@@ -152,12 +150,7 @@ export default class ExpressionParser extends LValParser {
 
   // Convenience method to parse an Expression only
   getExpression(): N.Expression & N.ParserOutput {
-    let paramFlags = PARAM;
-    if (this.hasPlugin("topLevelAwait") && this.inModule) {
-      paramFlags |= PARAM_AWAIT;
-    }
-    this.scope.enter(SCOPE_PROGRAM);
-    this.prodParam.enter(paramFlags);
+    this.enterInitialScopes();
     this.nextToken();
     const expr = this.parseExpression();
     if (!this.match(tt.eof)) {
@@ -615,12 +608,7 @@ export default class ExpressionParser extends LValParser {
         ? this.state.type.startsExpr
         : this.state.type.startsExpr && !this.match(tt.modulo);
       if (startsExpr && !this.isAmbiguousAwait()) {
-        this.raiseOverwrite(
-          startPos,
-          this.hasPlugin("topLevelAwait")
-            ? Errors.AwaitNotInAsyncContext
-            : Errors.AwaitNotInAsyncFunction,
-        );
+        this.raiseOverwrite(startPos, Errors.AwaitNotInAsyncContext);
         return this.parseAwait(startPos, startLoc);
       }
     }

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

@@ -395,7 +395,7 @@ export default class UtilParser extends Tokenizer {
 
   enterInitialScopes() {
     let paramFlags = PARAM;
-    if (this.hasPlugin("topLevelAwait") && this.inModule) {
+    if (this.inModule) {
       paramFlags |= PARAM_AWAIT;
     }
     this.scope.enter(SCOPE_PROGRAM);

packages/babel-parser/test/expressions/experimental/top-level-await/options.json

@@ -1,3 +0,0 @@
-{
-  "plugins": ["topLevelAwait"]
-}

packages/babel-parser/test/fixtures/es2015/uncategorised/357/options.json

@@ -1,3 +1,4 @@
 {
-  "sourceType": "module"
+  "sourceType": "module",
+  "throws": "Unexpected token (1:6)"
 }

packages/babel-parser/test/fixtures/es2015/uncategorised/357/output.json

@@ -1,40 +0,0 @@
-{
-  "type": "File",
-  "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
-  "errors": [
-    "SyntaxError: Unexpected reserved word 'await'. (1:0)"
-  ],
-  "program": {
-    "type": "Program",
-    "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
-    "sourceType": "module",
-    "interpreter": null,
-    "body": [
-      {
-        "type": "ExpressionStatement",
-        "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
-        "expression": {
-          "type": "AssignmentExpression",
-          "start":0,"end":13,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":13}},
-          "operator": "=",
-          "left": {
-            "type": "Identifier",
-            "start":0,"end":5,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":5},"identifierName":"await"},
-            "name": "await"
-          },
-          "right": {
-            "type": "CallExpression",
-            "start":8,"end":13,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":13}},
-            "callee": {
-              "type": "Identifier",
-              "start":8,"end":11,"loc":{"start":{"line":1,"column":8},"end":{"line":1,"column":11},"identifierName":"foo"},
-              "name": "foo"
-            },
-            "arguments": []
-          }
-        }
-      }
-    ],
-    "directives": []
-  }
-}

packages/babel-parser/test/fixtures/es2015/uncategorised/359/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
   "errors": [
-    "SyntaxError: Unexpected reserved word 'await'. (1:6)"
+    "SyntaxError: Can not use 'await' as identifier inside an async function. (1:6)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2015/uncategorised/361/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":24,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":24}},
   "errors": [
-    "SyntaxError: Unexpected reserved word 'await'. (1:8)"
+    "SyntaxError: Can not use 'await' as identifier inside an async function. (1:8)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2015/uncategorised/365/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":19,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":19}},
   "errors": [
-    "SyntaxError: Unexpected reserved word 'await'. (1:9)"
+    "SyntaxError: Can not use 'await' as identifier inside an async function. (1:9)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2015/uncategorised/367/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":14,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":14}},
   "errors": [
-    "SyntaxError: Unexpected reserved word 'await'. (1:6)"
+    "SyntaxError: Can not use 'await' as identifier inside an async function. (1:6)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2017/async-functions/9/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":40,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":40}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (1:24)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (1:24)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2017/async-functions/allow-await-outside-function-throw/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":33,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (2:9)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (2:9)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-arrow-expression-disallowed/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":17,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":17}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (1:8)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (1:8)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-parameters-of-async-arrow-function/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":26,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":26}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (1:11)",
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (1:11)",
     "SyntaxError: 'await' is not allowed in async function parameters. (1:11)"
   ],
   "program": {

packages/babel-parser/test/fixtures/es2017/async-functions/await-inside-parameters-of-nested-function/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":55,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (2:19)",
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (2:19)",
     "SyntaxError: 'await' is not allowed in async function parameters. (2:19)"
   ],
   "program": {

packages/babel-parser/test/fixtures/es2017/async-functions/invalid-await-with-object-exp-in-function/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":35,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (2:2)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (2:2)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-export-dflt-async-function/output.json

@@ -3,7 +3,7 @@
   "start":0,"end":50,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":50}},
   "errors": [
     "SyntaxError: Missing semicolon. (1:25)",
-    "SyntaxError: 'await' is only allowed within async functions. (1:41)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (1:41)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2017/async-functions/invalid-escape-sequence-arrow/output.json

@@ -3,7 +3,7 @@
   "start":0,"end":27,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":27}},
   "errors": [
     "SyntaxError: Missing semicolon. (1:10)",
-    "SyntaxError: 'await' is only allowed within async functions. (1:18)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (1:18)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2022/top-level-await-module/inside-class-property/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":33,"loc":{"start":{"line":1,"column":0},"end":{"line":3,"column":1}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (2:6)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (2:6)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/es2022/top-level-await-module/options.json

@@ -0,0 +1,3 @@
+{
+  "sourceType": "module"
+}

packages/babel-parser/test/fixtures/es2022/top-level-await-script/for-await/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "Unexpected token, expected \"(\" (1:4)"
+}

packages/babel-parser/test/fixtures/es2022/top-level-await-script/options.json

@@ -0,0 +1,3 @@
+{
+  "sourceType": "script"
+}

packages/babel-parser/test/fixtures/es2022/top-level-await-unambiguous/ambiguous-allowAwaitOutsideFunction/options.json

@@ -0,0 +1,3 @@
+{
+  "allowAwaitOutsideFunction": true
+}

packages/babel-parser/test/fixtures/es2022/top-level-await-unambiguous/ambiguous-v8intrinsinc/options.json

@@ -0,0 +1,3 @@
+{
+  "plugins": ["v8intrinsic"]
+}

packages/babel-parser/test/fixtures/es2022/top-level-await-unambiguous/options.json

@@ -1,4 +1,3 @@
 {
-  "plugins": ["topLevelAwait"],
   "sourceType": "unambiguous"
 }

packages/babel-parser/test/fixtures/experimental/class-static-block/invalid-await/output.json

@@ -2,7 +2,7 @@
   "type": "File",
   "start":0,"end":95,"loc":{"start":{"line":1,"column":0},"end":{"line":8,"column":1}},
   "errors": [
-    "SyntaxError: 'await' is only allowed within async functions. (5:6)"
+    "SyntaxError: 'await' is only allowed within async functions and at the top levels of modules. (5:6)"
   ],
   "program": {
     "type": "Program",

packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-await-label-in-module-blocks/options.json

@@ -1,4 +1,5 @@
 {
   "sourceType": "script",
-  "plugins": ["moduleBlocks"]
+  "plugins": ["moduleBlocks"],
+  "throws": "Unexpected token (1:14)"
 }

packages/babel-parser/test/fixtures/experimental/module-blocks/invalid-await-label-in-module-blocks/output.json

@@ -1,55 +0,0 @@
-{
-  "type": "File",
-  "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
-  "errors": [
-    "SyntaxError: Unexpected reserved word 'await'. (1:9)"
-  ],
-  "program": {
-    "type": "Program",
-    "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
-    "sourceType": "script",
-    "interpreter": null,
-    "body": [
-      {
-        "type": "ExpressionStatement",
-        "start":0,"end":20,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":20}},
-        "expression": {
-          "type": "ModuleExpression",
-          "start":0,"end":19,"loc":{"start":{"line":1,"column":0},"end":{"line":1,"column":19}},
-          "body": {
-            "type": "Program",
-            "start":9,"end":19,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":19}},
-            "sourceType": "module",
-            "interpreter": null,
-            "body": [
-              {
-                "type": "LabeledStatement",
-                "start":9,"end":17,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":17}},
-                "body": {
-                  "type": "ExpressionStatement",
-                  "start":16,"end":17,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":17}},
-                  "expression": {
-                    "type": "NumericLiteral",
-                    "start":16,"end":17,"loc":{"start":{"line":1,"column":16},"end":{"line":1,"column":17}},
-                    "extra": {
-                      "rawValue": 3,
-                      "raw": "3"
-                    },
-                    "value": 3
-                  }
-                },
-                "label": {
-                  "type": "Identifier",
-                  "start":9,"end":14,"loc":{"start":{"line":1,"column":9},"end":{"line":1,"column":14},"identifierName":"await"},
-                  "name": "await"
-                }
-              }
-            ],
-            "directives": []
-          }
-        }
-      }
-    ],
-    "directives": []
-  }
-}

packages/babel-parser/test/fixtures/experimental/module-blocks/valid-top-level-await-in-module-blocks/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/export-default/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/for-await-module/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/for-await-script/options.json

@@ -1,5 +0,0 @@
-{
-  "plugins": ["topLevelAwait"],
-  "sourceType": "script",
-  "throws": "Unexpected token, expected \"(\" (1:4)"
-}

packages/babel-parser/test/fixtures/experimental/top-level-await/inside-arrow/options.json

@@ -1,6 +0,0 @@
-{
-  "plugins": [
-    "topLevelAwait"
-  ],
-  "sourceType": "module"
-}

packages/babel-parser/test/fixtures/experimental/top-level-await/inside-block/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/inside-class-property/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/inside-function/options.json

@@ -1,6 +0,0 @@
-{
-  "plugins": [
-    "topLevelAwait"
-  ],
-  "sourceType": "module"
-  }

packages/babel-parser/test/fixtures/experimental/top-level-await/inside-property-key/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/top-level-module/options.json

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

packages/babel-parser/test/fixtures/experimental/top-level-await/top-level-script/options.json

@@ -1,4 +0,0 @@
-{
-  "plugins": ["topLevelAwait"],
-  "sourceType": "script"
-}

packages/babel-parser/test/fixtures/experimental/top-level-await/unambiguous-ambiguous-allowAwaitOutsideFunction/options.json

@@ -1,5 +0,0 @@
-{
-  "plugins": ["topLevelAwait"],
-  "sourceType": "unambiguous",
-  "allowAwaitOutsideFunction": true
-}

packages/babel-parser/test/fixtures/experimental/top-level-await/unambiguous-ambiguous-script/options.json

@@ -1,4 +0,0 @@
-{
-  "plugins": ["topLevelAwait"],
-  "sourceType": "unambiguous"
-}

packages/babel-parser/test/fixtures/experimental/top-level-await/unambiguous-ambiguous-v8intrinsinc/options.json

@@ -1,4 +0,0 @@
-{
-  "plugins": ["topLevelAwait", "v8intrinsic"],
-  "sourceType": "unambiguous"
-}

packages/babel-parser/test/fixtures/experimental/top-level-await/unambiguous-module/options.json

@@ -1,4 +0,0 @@
-{
-  "plugins": ["topLevelAwait"],
-  "sourceType": "unambiguous"
-}