Enable optional chaining by default in @babel/parser (#10817)

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

@@ -587,7 +587,6 @@ export default class ExpressionParser extends LValParser {
     }
     let optional = false;
     if (this.match(tt.questionDot)) {
-      this.expectPlugin("optionalChaining");
       state.optionalChainMember = optional = true;
       if (noCalls && this.lookaheadCharCode() === charCodes.leftParenthesis) {
         state.stop = true;

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

@@ -2801,7 +2801,6 @@ export default (superClass: Class<Parser>): Class<Parser> =>
       subscriptState: N.ParseSubscriptState,
     ): N.Expression {
       if (this.match(tt.questionDot) && this.isLookaheadRelational("<")) {
-        this.expectPlugin("optionalChaining");
         subscriptState.optionalChainMember = true;
         if (noCalls) {
           subscriptState.stop = true;

packages/babel-parser/test/fixtures/experimental/_no-plugin/optional-chaining/input.js

@@ -1 +0,0 @@
-a?.b

packages/babel-parser/test/fixtures/experimental/_no-plugin/optional-chaining/options.json

@@ -1,3 +0,0 @@
-{
-  "throws": "This experimental syntax requires enabling the parser plugin: 'optionalChaining' (1:1)"
-}

packages/babel-parser/test/fixtures/experimental/optional-chaining/class-contructor-call/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/conditional-decimal/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/function-call/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/member-access-bracket/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/member-access/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/optioanl-chain-expression/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/optional-constructor/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/optional-super-property-class/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/optional-super-property/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/optional-tagged-template-literals/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/parenthised-chain/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/separated-chaining/options.json

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

packages/babel-parser/test/fixtures/experimental/optional-chaining/super-method-class/options.json

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

packages/babel-parser/test/fixtures/flow/typeapp-call/function-call-optional/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["jsx", "flow", "optionalChaining"]
+  "plugins": ["jsx", "flow"]
 }

packages/babel-parser/test/fixtures/flow/typeapp-call/method-call-optional/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["jsx", "flow", "optionalChaining"]
+  "plugins": ["jsx", "flow"]
 }

packages/babel-parser/test/fixtures/flow/typeapp-call/method-call-optional2/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["jsx", "flow", "optionalChaining"]
+  "plugins": ["jsx", "flow"]
 }

packages/babel-parser/test/fixtures/typescript/optional-chaining/type-arguments/options.json

@@ -1,4 +1,4 @@
 {
   "sourceType": "module",
-  "plugins": ["typescript", "optionalChaining"]
+  "plugins": ["typescript"]
 }

packages/babel-parser/test/fixtures/v8intrinsic/_errors/optional-call-expression/options.json

@@ -1,4 +1,4 @@
 {
-  "plugins": ["optionalChaining", "v8intrinsic"],
+  "plugins": ["v8intrinsic"],
   "throws": "Unexpected token (1:0)"
 }