Enable nullish coalescing by default in @babel/parser (#10819)

* move files, remove hasPlugin() & expectPlugin()

* restore permissions

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

@@ -196,7 +196,6 @@ export default class ExpressionParser extends LValParser {
       node.operator = operator;
 
       if (operator === "??=") {
-        this.expectPlugin("nullishCoalescingOperator");
         this.expectPlugin("logicalAssignment");
       }
       if (operator === "||=" || operator === "&&=") {
@@ -333,8 +332,6 @@ export default class ExpressionParser extends LValParser {
           this.expectPlugin("pipelineOperator");
           this.state.inPipeline = true;
           this.checkPipelineAtInfixOperator(left, leftStartPos);
-        } else if (op === tt.nullishCoalescing) {
-          this.expectPlugin("nullishCoalescingOperator");
         }
 
         this.next();

packages/babel-parser/test/fixtures/es2020/nullish-coalescing-operator/no-paren-and-nullish/options.json

@@ -1,4 +1,4 @@
 {
-  "plugins": ["nullishCoalescingOperator", "estree"],
+  "plugins": ["estree"],
   "throws": "Nullish coalescing operator(??) requires parens when mixing with logical operators (1:0)"
 }

packages/babel-parser/test/fixtures/es2020/nullish-coalescing-operator/no-paren-nullish-and/options.json

@@ -1,4 +1,3 @@
 {
-  "plugins": ["nullishCoalescingOperator"],
   "throws": "Nullish coalescing operator(??) requires parens when mixing with logical operators (1:5)"
 }

packages/babel-parser/test/fixtures/es2020/nullish-coalescing-operator/no-paren-nullish-or/options.json

@@ -1,4 +1,3 @@
 {
-  "plugins": ["nullishCoalescingOperator"],
   "throws": "Nullish coalescing operator(??) requires parens when mixing with logical operators (1:10)"
 }

packages/babel-parser/test/fixtures/es2020/nullish-coalescing-operator/no-paren-or-nullish/options.json

@@ -1,4 +1,4 @@
 {
-  "plugins": ["nullishCoalescingOperator", "estree"],
+  "plugins": ["estree"],
   "throws": "Nullish coalescing operator(??) requires parens when mixing with logical operators (1:0)"
 }

packages/babel-parser/test/fixtures/es2020/nullish-coalescing-operator/with-pipeline/options.json

@@ -1,6 +1,5 @@
 {
   "plugins": [
-    "nullishCoalescingOperator",
     ["pipelineOperator", { "proposal": "minimal" }]
   ]
 }

packages/babel-parser/test/fixtures/experimental/logical-assignment-operator/qq-equals-no-null-coalesce-plugin/input.js

@@ -1,2 +0,0 @@
-a ??= b;
-obj.a ??= b;

packages/babel-parser/test/fixtures/experimental/logical-assignment-operator/qq-equals-no-null-coalesce-plugin/options.json

@@ -1,4 +0,0 @@
-{
-  "plugins": ["logicalAssignment"],
-  "throws": "This experimental syntax requires enabling the parser plugin: 'nullishCoalescingOperator' (1:2)"
-}

packages/babel-parser/test/fixtures/experimental/logical-assignment-operator/qq-equals-no-plugin/options.json

@@ -1,4 +1,3 @@
 {
-  "plugins": ["nullishCoalescingOperator"],
   "throws": "This experimental syntax requires enabling the parser plugin: 'logicalAssignment' (1:2)"
 }

packages/babel-parser/test/fixtures/experimental/logical-assignment-operator/qq-equals/options.json

@@ -1,3 +1,3 @@
 {
-  "plugins": ["logicalAssignment", "nullishCoalescingOperator"]
+  "plugins": ["logicalAssignment"]
 }

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/and-nullish/options.json

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

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/associativity/options.json

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

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/expression/options.json

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

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/multiline/options.json

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

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/no-plugin-error/input.js

@@ -1 +0,0 @@
-foo ?? 1;

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/no-plugin-error/options.json

@@ -1,3 +0,0 @@
-{
-  "throws": "This experimental syntax requires enabling the parser plugin: 'nullishCoalescingOperator' (1:4)"
-}

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/nullish-and/options.json

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

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/nullish-or/options.json

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

packages/babel-parser/test/fixtures/experimental/nullish-coalescing-operator/or-nullish/options.json

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