Update: add ES2022 class features support (refs eslint/eslint#14343)

lib/options.js

@@ -17,7 +17,8 @@ const SUPPORTED_VERSIONS = [
     9,
     10,
     11,
-    12
+    12,
+    13
 ];
 
 /**

lib/token-translator.js

@@ -20,6 +20,7 @@ const Token = {
     Boolean: "Boolean",
     EOF: "<end>",
     Identifier: "Identifier",
+    PrivateIdentifier: "PrivateIdentifier",
     Keyword: "Keyword",
     Null: "Null",
     Numeric: "Numeric",
@@ -114,6 +115,9 @@ TokenTranslator.prototype = {
                 token.type = Token.Keyword;
             }
 
+        } else if (type === tt.privateId) {
+            token.type = Token.PrivateIdentifier;
+
         } else if (type === tt.semi || type === tt.comma ||
                  type === tt.parenL || type === tt.parenR ||
                  type === tt.braceL || type === tt.braceR ||

package.json

@@ -31,9 +31,9 @@
   },
   "license": "BSD-2-Clause",
   "dependencies": {
-    "acorn": "^8.1.0",
+    "acorn": "^8.2.1",
     "acorn-jsx": "^5.3.1",
-    "eslint-visitor-keys": "^2.0.0"
+    "eslint-visitor-keys": "github:eslint/eslint-visitor-keys#908fdf8c0d9a352c696c8c1f4901280d1a0795f7"
   },
   "devDependencies": {
     "@rollup/plugin-commonjs": "^17.1.0",

tests/fixtures/ecma-version/13/class-fields/invalid-delete-private-optional.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 28,
+    "lineNumber": 3,
+    "column": 11,
+    "message": "Private fields can not be deleted"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-delete-private-optional.src.js

@@ -0,0 +1,4 @@
+class C {
+    #a;
+    f() { delete this?.#a }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-delete-private.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 28,
+    "lineNumber": 3,
+    "column": 11,
+    "message": "Private fields can not be deleted"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-delete-private.src.js

@@ -0,0 +1,4 @@
+class C {
+    #a;
+    f() { delete this.#a }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-init-arguments.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 43,
+    "lineNumber": 3,
+    "column": 15,
+    "message": "Cannot use 'arguments' in class field initializer"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-init-arguments.src.js

@@ -0,0 +1,5 @@
+function f() {
+    class C {
+        aaa = arguments
+    }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-init-arrow-arguments.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 49,
+    "lineNumber": 3,
+    "column": 21,
+    "message": "Cannot use 'arguments' in class field initializer"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-init-arrow-arguments.src.js

@@ -0,0 +1,5 @@
+function f() {
+    class C {
+        aaa = () => arguments
+    }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-init-yield.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 333,
+    "lineNumber": 7,
+    "column": 15,
+    "message": "The keyword 'yield' is reserved"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-init-yield.src.js

@@ -0,0 +1,9 @@
+function* f() {
+    class C {
+        // `yield` is an identifier reference in field initializers even if it's in a generator function.
+        // But `yield` as identifier references is disallowed in strict mode.
+        // And the inside of classes is always strict mode.
+        // Therefore this is a syntax error.
+        aaa = yield
+    }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-member-private-undef.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 41,
+    "lineNumber": 4,
+    "column": 14,
+    "message": "Private field '#b' must be declared in an enclosing class"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-member-private-undef.src.js

@@ -0,0 +1,6 @@
+class C {
+    #a;
+    f() {
+        this.#b
+    }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-member-super-private.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 49,
+    "lineNumber": 3,
+    "column": 17,
+    "message": "Unexpected token #foo"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-member-super-private.src.js

@@ -0,0 +1,4 @@
+class C extends Base {
+    #foo;
+    f() { super.#foo }
+}

tests/fixtures/ecma-version/13/class-fields/invalid-private-constructor.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 14,
+    "lineNumber": 2,
+    "column": 5,
+    "message": "Classes can't have an element named '#constructor'"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-private-constructor.src.js

@@ -0,0 +1,3 @@
+class C {
+    #constructor = () => {}
+}

tests/fixtures/ecma-version/13/class-fields/invalid-private-dupelicate.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 22,
+    "lineNumber": 3,
+    "column": 5,
+    "message": "Identifier '#a' has already been declared"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-private-dupelicate.src.js

@@ -0,0 +1,4 @@
+class C {
+    #a;
+    #a;
+}

tests/fixtures/ecma-version/13/class-fields/invalid-public-constructor.result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 14,
+    "lineNumber": 2,
+    "column": 5,
+    "message": "Classes can't have a field named 'constructor'"
+};

tests/fixtures/ecma-version/13/class-fields/invalid-public-constructor.src.js

@@ -0,0 +1,3 @@
+class C {
+    constructor = () => {}
+}

tests/fixtures/ecma-version/13/class-fields/mixed-init-await.module-result.js

@@ -0,0 +1,6 @@
+export default {
+    "index": 304,
+    "lineNumber": 6,
+    "column": 15,
+    "message": "Cannot use keyword 'await' outside an async function"
+};