Class Private Static Accessors (#10217)

* Remove error for static private accessors

* Private static accessors strict

* Add loose mode support

* Move `value` decl for early return

* Reuse getter/setter template

* Reuse getter/setter templates

* Use `buildUndefinedNode` in accessor templates

* Extract `isAccessor` variable

packages/babel-helper-create-class-features-plugin/src/features.js

@@ -66,12 +66,6 @@ export function verifyUsedFeatures(path, file) {
     if (!hasFeature(file, FEATURES.privateMethods)) {
       throw path.buildCodeFrameError("Class private methods are not enabled.");
     }
-
-    if (path.node.static && path.node.kind !== "method") {
-      throw path.buildCodeFrameError(
-        "@babel/plugin-class-features doesn't support class static private accessors yet.",
-      );
-    }
   }
 
   if (

packages/babel-helper-create-class-features-plugin/src/fields.js

@@ -44,6 +44,7 @@ export function buildPrivateNamesNodes(privateNamesMap, loose, state) {
     // because static fields are directly assigned to a variable in the
     // buildPrivateStaticFieldInitSpec function.
     const { id, static: isStatic, method: isMethod, getId, setId } = value;
+    const isAccessor = getId || setId;
     if (loose) {
       initNodes.push(
         template.statement.ast`
@@ -51,7 +52,7 @@ export function buildPrivateNamesNodes(privateNamesMap, loose, state) {
         `,
       );
     } else if (isMethod && !isStatic) {
-      if (getId || setId) {
+      if (isAccessor) {
         initNodes.push(template.statement.ast`var ${id} = new WeakMap();`);
       } else {
         initNodes.push(template.statement.ast`var ${id} = new WeakSet();`);
@@ -140,9 +141,11 @@ const privateNameHandlerSpec = {
       getId,
       setId,
     } = privateNamesMap.get(name);
+    const isAccessor = getId || setId;
 
     if (isStatic) {
-      const helperName = isMethod
+      const helperName =
+        isMethod && !isAccessor
           ? "classStaticPrivateMethodGet"
           : "classStaticPrivateFieldSpecGet";
 
@@ -154,7 +157,7 @@ const privateNameHandlerSpec = {
     }
 
     if (isMethod) {
-      if (getId || setId) {
+      if (isAccessor) {
         return t.callExpression(file.addHelper("classPrivateFieldGet"), [
           this.receiver(member),
           t.cloneNode(id),
@@ -180,10 +183,13 @@ const privateNameHandlerSpec = {
       static: isStatic,
       method: isMethod,
       setId,
+      getId,
     } = privateNamesMap.get(name);
+    const isAccessor = getId || setId;
 
     if (isStatic) {
-      const helperName = isMethod
+      const helperName =
+        isMethod && !isAccessor
           ? "classStaticPrivateMethodSet"
           : "classStaticPrivateFieldSpecSet";
 
@@ -300,9 +306,30 @@ function buildPrivateInstanceFieldInitSpec(ref, prop, privateNamesMap) {
 }
 
 function buildPrivateStaticFieldInitSpec(prop, privateNamesMap) {
-  const { id } = privateNamesMap.get(prop.node.key.id.name);
+  const privateName = privateNamesMap.get(prop.node.key.id.name);
-  const value = prop.node.value || prop.scope.buildUndefinedNode();
+  const { id, getId, setId, initAdded } = privateName;
+  const isAccessor = getId || setId;
 
+  if (!prop.isProperty() && (initAdded || !isAccessor)) return;
+
+  if (isAccessor) {
+    privateNamesMap.set(prop.node.key.id.name, {
+      ...privateName,
+      initAdded: true,
+    });
+
+    return template.statement.ast`
+      var ${id.name} = {
+        // configurable is false by default
+        // enumerable is false by default
+        // writable is false by default
+        get: ${getId ? getId.name : prop.scope.buildUndefinedNode()},
+        set: ${setId ? setId.name : prop.scope.buildUndefinedNode()}
+      }
+    `;
+  }
+
+  const value = prop.node.value || prop.scope.buildUndefinedNode();
   return template.statement.ast`
     var ${id} = {
       // configurable is false by default
@@ -328,76 +355,44 @@ function buildPrivateMethodInitLoose(ref, prop, privateNamesMap) {
         });
       `;
   }
-
+  const isAccessor = getId || setId;
-  if (getId || setId) {
+  if (isAccessor) {
     privateNamesMap.set(prop.node.key.id.name, {
       ...privateName,
       initAdded: true,
     });
 
-    if (getId && setId) {
     return template.statement.ast`
       Object.defineProperty(${ref}, ${id}, {
         // configurable is false by default
         // enumerable is false by default
         // writable is false by default
-          get: ${getId.name},
+        get: ${getId ? getId.name : prop.scope.buildUndefinedNode()},
-          set: ${setId.name}
+        set: ${setId ? setId.name : prop.scope.buildUndefinedNode()}
       });
     `;
-    } else if (getId && !setId) {
-      return template.statement.ast`
-        Object.defineProperty(${ref}, ${id}, {
-          // configurable is false by default
-          // enumerable is false by default
-          // writable is false by default
-          get: ${getId.name}
-        });
-      `;
-    } else if (!getId && setId) {
-      return template.statement.ast`
-        Object.defineProperty(${ref}, ${id}, {
-          // configurable is false by default
-          // enumerable is false by default
-          // writable is false by default
-          set: ${setId.name}
-        });
-      `;
-    }
   }
 }
 
 function buildPrivateInstanceMethodInitSpec(ref, prop, privateNamesMap) {
   const privateName = privateNamesMap.get(prop.node.key.id.name);
   const { id, getId, setId, initAdded } = privateName;
+
   if (initAdded) return;
 
-  if (getId || setId) {
+  const isAccessor = getId || setId;
+  if (isAccessor) {
     privateNamesMap.set(prop.node.key.id.name, {
       ...privateName,
       initAdded: true,
     });
 
-    if (getId && setId) {
     return template.statement.ast`
       ${id}.set(${ref}, {
-          get: ${getId.name},
+        get: ${getId ? getId.name : prop.scope.buildUndefinedNode()},
-          set: ${setId.name}
+        set: ${setId ? setId.name : prop.scope.buildUndefinedNode()}
       });
     `;
-    } else if (getId && !setId) {
-      return template.statement.ast`
-        ${id}.set(${ref}, {
-          get: ${getId.name}
-        });
-      `;
-    } else if (!getId && setId) {
-      return template.statement.ast`
-        ${id}.set(${ref}, {
-          set: ${setId.name}
-        });
-      `;
-    }
   }
   return template.statement.ast`${id}.add(${ref})`;
 }
@@ -429,7 +424,29 @@ function buildPublicFieldInitSpec(ref, prop, state) {
 }
 
 function buildPrivateStaticMethodInitLoose(ref, prop, state, privateNamesMap) {
-  const { id, methodId } = privateNamesMap.get(prop.node.key.id.name);
+  const privateName = privateNamesMap.get(prop.node.key.id.name);
+  const { id, methodId, getId, setId, initAdded } = privateName;
+
+  if (initAdded) return;
+
+  const isAccessor = getId || setId;
+  if (isAccessor) {
+    privateNamesMap.set(prop.node.key.id.name, {
+      ...privateName,
+      initAdded: true,
+    });
+
+    return template.statement.ast`
+      Object.defineProperty(${ref}, ${id}, {
+        // configurable is false by default
+        // enumerable is false by default
+        // writable is false by default
+        get: ${getId ? getId.name : prop.scope.buildUndefinedNode()},
+        set: ${setId ? setId.name : prop.scope.buildUndefinedNode()}
+      })
+    `;
+  }
+
   return template.statement.ast`
     Object.defineProperty(${ref}, ${id}, {
       // configurable is false by default
@@ -615,14 +632,14 @@ export function buildFieldsInitNodes(
       case isStatic && isPrivate && isMethod && !loose:
         needsClassRef = true;
         staticNodes.push(
+          buildPrivateStaticFieldInitSpec(prop, privateNamesMap),
+        );
+        staticNodes.unshift(
           buildPrivateMethodDeclaration(prop, privateNamesMap, loose),
         );
         break;
       case isStatic && isPrivate && isMethod && loose:
         needsClassRef = true;
-        staticNodes.push(
-          buildPrivateMethodDeclaration(prop, privateNamesMap, loose),
-        );
         staticNodes.push(
           buildPrivateStaticMethodInitLoose(
             t.cloneNode(ref),
@@ -631,6 +648,9 @@ export function buildFieldsInitNodes(
             privateNamesMap,
           ),
         );
+        staticNodes.unshift(
+          buildPrivateMethodDeclaration(prop, privateNamesMap, loose),
+        );
         break;
       case isInstance && isPublic && isField && loose:
         instanceNodes.push(buildPublicFieldInitLoose(t.thisExpression(), prop));
@@ -646,7 +666,7 @@ export function buildFieldsInitNodes(
   }
 
   return {
-    staticNodes,
+    staticNodes: staticNodes.filter(Boolean),
     instanceNodes: instanceNodes.filter(Boolean),
     wrapClass(path) {
       for (const prop of props) {

packages/babel-helpers/src/helpers.js

@@ -1177,6 +1177,9 @@ helpers.classStaticPrivateFieldSpecGet = helper("7.0.2")`
     if (receiver !== classConstructor) {
       throw new TypeError("Private static access of wrong provenance");
     }
+    if (descriptor.get) {
+      return descriptor.get.call(receiver);
+    }
     return descriptor.value;
   }
 `;
@@ -1186,6 +1189,9 @@ helpers.classStaticPrivateFieldSpecSet = helper("7.0.2")`
     if (receiver !== classConstructor) {
       throw new TypeError("Private static access of wrong provenance");
     }
+    if (descriptor.set) {
+      descriptor.set.call(receiver, value);
+    } else {
       if (!descriptor.writable) {
         // This should only throw in strict mode, but class bodies are
         // always strict and private fields can only be used inside
@@ -1193,6 +1199,8 @@ helpers.classStaticPrivateFieldSpecSet = helper("7.0.2")`
         throw new TypeError("attempted to set read only private field");
       }
       descriptor.value = value;
+    }
+
     return value;
   }
 `;

packages/babel-plugin-proposal-private-methods/test/fixtures/accessors-loose/get-only-setter/output.js

@@ -1,6 +1,7 @@
 class Cl {
   constructor() {
     Object.defineProperty(this, _privateFieldValue, {
+      get: void 0,
       set: _set_privateFieldValue
     });
     Object.defineProperty(this, _privateField, {

packages/babel-plugin-proposal-private-methods/test/fixtures/accessors-loose/set-only-getter/output.js

@@ -1,7 +1,8 @@
 class Cl {
   constructor() {
     Object.defineProperty(this, _privateFieldValue, {
-      get: _get_privateFieldValue
+      get: _get_privateFieldValue,
+      set: void 0
     });
     Object.defineProperty(this, _privateField, {
       writable: true,

packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/get-only-setter/output.js

@@ -1,6 +1,7 @@
 class Cl {
   constructor() {
     _privateFieldValue.set(this, {
+      get: void 0,
       set: _set_privateFieldValue
     });
 

packages/babel-plugin-proposal-private-methods/test/fixtures/accessors/set-only-getter/output.js

@@ -1,7 +1,8 @@
 class Cl {
   constructor() {
     _privateFieldValue.set(this, {
-      get: _get_privateFieldValue
+      get: _get_privateFieldValue,
+      set: void 0
     });
 
     _privateField.set(this, {

packages/babel-plugin-proposal-private-methods/test/fixtures/private-static-method-loose/this/output.js

@@ -20,6 +20,10 @@ var _getA = babelHelpers.classPrivateFieldLooseKey("getA");
 
 var _getB = babelHelpers.classPrivateFieldLooseKey("getB");
 
+var _getB2 = function _getB2() {
+  return this.b;
+};
+
 var _getA2 = function _getA2() {
   return A.a;
 };
@@ -27,11 +31,6 @@ var _getA2 = function _getA2() {
 Object.defineProperty(B, _getA, {
   value: _getA2
 });
-
-var _getB2 = function _getB2() {
-  return this.b;
-};
-
 Object.defineProperty(B, _getB, {
   value: _getB2
 });

packages/babel-plugin-proposal-private-methods/test/fixtures/private-static-method/this/output.js

@@ -16,12 +16,12 @@ class B extends A {
 
 }
 
-var _getA = function _getA() {
-  return babelHelpers.get(babelHelpers.getPrototypeOf(B), "a", this);
-};
-
 var _getB = function _getB() {
   return this.b;
 };
 
+var _getA = function _getA() {
+  return babelHelpers.get(babelHelpers.getPrototypeOf(B), "a", this);
+};
+
 var [getA, getB] = B.extract();

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/basic/exec.js

@@ -0,0 +1,23 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = "top secret string";
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = `Updated: ${newValue}`;
+  }
+
+  static getValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+
+  static setValue() {
+    Cl.#privateStaticFieldValue = "dank";
+  }
+}
+
+expect(Cl.getValue()).toEqual("top secret string");
+Cl.setValue();
+expect(Cl.getValue()).toEqual("Updated: dank");

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/basic/input.js

@@ -0,0 +1,19 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = "top secret string";
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = `Updated: ${newValue}`;
+  }
+
+  static getValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+
+  static setValue() {
+    Cl.#privateStaticFieldValue = "dank";
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/basic/output.js

@@ -0,0 +1,31 @@
+class Cl {
+  static getValue() {
+    return babelHelpers.classPrivateFieldLooseBase(Cl, _privateStaticFieldValue)[_privateStaticFieldValue];
+  }
+
+  static setValue() {
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateStaticFieldValue)[_privateStaticFieldValue] = "dank";
+  }
+
+}
+
+var _PRIVATE_STATIC_FIELD = babelHelpers.classPrivateFieldLooseKey("PRIVATE_STATIC_FIELD");
+
+var _privateStaticFieldValue = babelHelpers.classPrivateFieldLooseKey("privateStaticFieldValue");
+
+var _set_privateStaticFieldValue = function (newValue) {
+  babelHelpers.classPrivateFieldLooseBase(Cl, _PRIVATE_STATIC_FIELD)[_PRIVATE_STATIC_FIELD] = `Updated: ${newValue}`;
+};
+
+var _get_privateStaticFieldValue = function () {
+  return babelHelpers.classPrivateFieldLooseBase(Cl, _PRIVATE_STATIC_FIELD)[_PRIVATE_STATIC_FIELD];
+};
+
+Object.defineProperty(Cl, _PRIVATE_STATIC_FIELD, {
+  writable: true,
+  value: "top secret string"
+});
+Object.defineProperty(Cl, _privateStaticFieldValue, {
+  get: _get_privateStaticFieldValue,
+  set: _set_privateStaticFieldValue
+});

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/get-only-setter/exec.js

@@ -0,0 +1,13 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = newValue;
+  }
+
+  static getPrivateStaticFieldValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+}
+
+expect(Cl.getPrivateStaticFieldValue()).toBeUndefined();

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/get-only-setter/input.js

@@ -0,0 +1,11 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = newValue;
+  }
+
+  static getPrivateStaticFieldValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/get-only-setter/output.js

@@ -0,0 +1,23 @@
+class Cl {
+  static getPrivateStaticFieldValue() {
+    return babelHelpers.classPrivateFieldLooseBase(Cl, _privateStaticFieldValue)[_privateStaticFieldValue];
+  }
+
+}
+
+var _PRIVATE_STATIC_FIELD = babelHelpers.classPrivateFieldLooseKey("PRIVATE_STATIC_FIELD");
+
+var _privateStaticFieldValue = babelHelpers.classPrivateFieldLooseKey("privateStaticFieldValue");
+
+var _set_privateStaticFieldValue = function (newValue) {
+  babelHelpers.classPrivateFieldLooseBase(Cl, _PRIVATE_STATIC_FIELD)[_PRIVATE_STATIC_FIELD] = newValue;
+};
+
+Object.defineProperty(Cl, _PRIVATE_STATIC_FIELD, {
+  writable: true,
+  value: 0
+});
+Object.defineProperty(Cl, _privateStaticFieldValue, {
+  get: void 0,
+  set: _set_privateStaticFieldValue
+});

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/options.json

@@ -0,0 +1,14 @@
+{
+  "plugins": [
+    [
+      "external-helpers",
+      {
+        "helperVersion": "7.1000.0"
+      }
+    ],
+    ["proposal-private-methods", { "loose": true }],
+    ["proposal-class-properties", { "loose": true }],
+    "transform-block-scoping",
+    "syntax-class-properties"
+  ]
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/set-only-getter/exec.js

@@ -0,0 +1,13 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static setPrivateStaticFieldValue() {
+    Cl.#privateStaticFieldValue = 1;
+  }
+}
+
+expect(() => Cl.setPrivateStaticFieldValue()).toThrow(TypeError);

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/set-only-getter/input.js

@@ -0,0 +1,11 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static setPrivateStaticFieldValue() {
+    Cl.#privateStaticFieldValue = 1;
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/set-only-getter/output.js

@@ -0,0 +1,23 @@
+class Cl {
+  static setPrivateStaticFieldValue() {
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateStaticFieldValue)[_privateStaticFieldValue] = 1;
+  }
+
+}
+
+var _PRIVATE_STATIC_FIELD = babelHelpers.classPrivateFieldLooseKey("PRIVATE_STATIC_FIELD");
+
+var _privateStaticFieldValue = babelHelpers.classPrivateFieldLooseKey("privateStaticFieldValue");
+
+var _get_privateStaticFieldValue = function () {
+  return babelHelpers.classPrivateFieldLooseBase(Cl, _PRIVATE_STATIC_FIELD)[_PRIVATE_STATIC_FIELD];
+};
+
+Object.defineProperty(Cl, _PRIVATE_STATIC_FIELD, {
+  writable: true,
+  value: 0
+});
+Object.defineProperty(Cl, _privateStaticFieldValue, {
+  get: _get_privateStaticFieldValue,
+  set: void 0
+});

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/updates/exec.js

@@ -0,0 +1,46 @@
+class Cl {
+  static #privateField = "top secret string";
+  static publicField = "not secret string";
+
+  static get #privateFieldValue() {
+    return Cl.#privateField;
+  }
+
+  static set #privateFieldValue(newValue) {
+    Cl.#privateField = newValue;
+  }
+
+  static publicGetPrivateField() {
+    return Cl.#privateFieldValue;
+  }
+
+  static publicSetPrivateField(newValue) {
+    Cl.#privateFieldValue = newValue;
+  }
+
+  static get publicFieldValue() {
+    return Cl.publicField;
+  }
+
+  static set publicFieldValue(newValue) {
+    Cl.publicField = newValue;
+  }
+
+  static testUpdates() {
+    Cl.#privateField = 0;
+    Cl.publicField = 0;
+    Cl.#privateFieldValue = Cl.#privateFieldValue++;
+    Cl.publicFieldValue = Cl.publicFieldValue++;
+    expect(Cl.#privateField).toEqual(Cl.publicField);
+
+    ++Cl.#privateFieldValue;
+    ++Cl.publicFieldValue;
+    expect(Cl.#privateField).toEqual(Cl.publicField);
+
+    Cl.#privateFieldValue += 1;
+    Cl.publicFieldValue += 1;
+    expect(Cl.#privateField).toEqual(Cl.publicField);
+  }
+}
+
+Cl.testUpdates();

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/updates/input.js

@@ -0,0 +1,44 @@
+class Cl {
+  static #privateField = "top secret string";
+  static publicField = "not secret string";
+
+  static get #privateFieldValue() {
+    return Cl.#privateField;
+  }
+
+  static set #privateFieldValue(newValue) {
+    Cl.#privateField = newValue;
+  }
+
+  static publicGetPrivateField() {
+    return Cl.#privateFieldValue;
+  }
+
+  static publicSetPrivateField(newValue) {
+    Cl.#privateFieldValue = newValue;
+  }
+
+  static get publicFieldValue() {
+    return Cl.publicField;
+  }
+
+  static set publicFieldValue(newValue) {
+    Cl.publicField = newValue;
+  }
+
+  static testUpdates() {
+    Cl.#privateField = 0;
+    Cl.publicField = 0;
+    Cl.#privateFieldValue = Cl.#privateFieldValue++;
+    Cl.publicFieldValue = Cl.publicFieldValue++;
+
+    ++Cl.#privateFieldValue;
+    ++Cl.publicFieldValue;
+
+    Cl.#privateFieldValue += 1;
+    Cl.publicFieldValue += 1;
+
+    Cl.#privateFieldValue = -(Cl.#privateFieldValue ** Cl.#privateFieldValue);
+    Cl.publicFieldValue = -(Cl.publicFieldValue ** Cl.publicFieldValue);
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors-loose/updates/output.js

@@ -0,0 +1,53 @@
+class Cl {
+  static publicGetPrivateField() {
+    return babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue];
+  }
+
+  static publicSetPrivateField(newValue) {
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue] = newValue;
+  }
+
+  static get publicFieldValue() {
+    return Cl.publicField;
+  }
+
+  static set publicFieldValue(newValue) {
+    Cl.publicField = newValue;
+  }
+
+  static testUpdates() {
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateField)[_privateField] = 0;
+    Cl.publicField = 0;
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue] = babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue]++;
+    Cl.publicFieldValue = Cl.publicFieldValue++;
+    ++babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue];
+    ++Cl.publicFieldValue;
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue] += 1;
+    Cl.publicFieldValue += 1;
+    babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue] = -(babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue] ** babelHelpers.classPrivateFieldLooseBase(Cl, _privateFieldValue)[_privateFieldValue]);
+    Cl.publicFieldValue = -(Cl.publicFieldValue ** Cl.publicFieldValue);
+  }
+
+}
+
+var _privateField = babelHelpers.classPrivateFieldLooseKey("privateField");
+
+var _privateFieldValue = babelHelpers.classPrivateFieldLooseKey("privateFieldValue");
+
+var _set_privateFieldValue = function (newValue) {
+  babelHelpers.classPrivateFieldLooseBase(Cl, _privateField)[_privateField] = newValue;
+};
+
+var _get_privateFieldValue = function () {
+  return babelHelpers.classPrivateFieldLooseBase(Cl, _privateField)[_privateField];
+};
+
+Object.defineProperty(Cl, _privateField, {
+  writable: true,
+  value: "top secret string"
+});
+Cl.publicField = "not secret string";
+Object.defineProperty(Cl, _privateFieldValue, {
+  get: _get_privateFieldValue,
+  set: _set_privateFieldValue
+});

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/basic/exec.js

@@ -0,0 +1,23 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = "top secret string";
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = `Updated: ${newValue}`;
+  }
+
+  static getValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+
+  static setValue() {
+    Cl.#privateStaticFieldValue = "dank";
+  }
+}
+
+expect(Cl.getValue()).toEqual("top secret string");
+Cl.setValue();
+expect(Cl.getValue()).toEqual("Updated: dank");

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/basic/input.js

@@ -0,0 +1,19 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = "top secret string";
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = `Updated: ${newValue}`;
+  }
+
+  static getValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+
+  static setValue() {
+    Cl.#privateStaticFieldValue = "dank";
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/basic/output.js

@@ -0,0 +1,27 @@
+class Cl {
+  static getValue() {
+    return babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateStaticFieldValue);
+  }
+
+  static setValue() {
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateStaticFieldValue, "dank");
+  }
+
+}
+
+var _set_privateStaticFieldValue = function (newValue) {
+  babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _PRIVATE_STATIC_FIELD, `Updated: ${newValue}`);
+};
+
+var _get_privateStaticFieldValue = function () {
+  return babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _PRIVATE_STATIC_FIELD);
+};
+
+var _PRIVATE_STATIC_FIELD = {
+  writable: true,
+  value: "top secret string"
+};
+var _privateStaticFieldValue = {
+  get: _get_privateStaticFieldValue,
+  set: _set_privateStaticFieldValue
+};

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/get-only-setter/exec.js

@@ -0,0 +1,13 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = newValue;
+  }
+
+  static getPrivateStaticFieldValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+}
+
+expect(Cl.getPrivateStaticFieldValue()).toBeUndefined();

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/get-only-setter/input.js

@@ -0,0 +1,11 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static set #privateStaticFieldValue(newValue) {
+    Cl.#PRIVATE_STATIC_FIELD = newValue;
+  }
+
+  static getPrivateStaticFieldValue() {
+    return Cl.#privateStaticFieldValue;
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/get-only-setter/output.js

@@ -0,0 +1,19 @@
+class Cl {
+  static getPrivateStaticFieldValue() {
+    return babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateStaticFieldValue);
+  }
+
+}
+
+var _set_privateStaticFieldValue = function (newValue) {
+  babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _PRIVATE_STATIC_FIELD, newValue);
+};
+
+var _PRIVATE_STATIC_FIELD = {
+  writable: true,
+  value: 0
+};
+var _privateStaticFieldValue = {
+  get: void 0,
+  set: _set_privateStaticFieldValue
+};

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/options.json

@@ -0,0 +1,14 @@
+{
+  "plugins": [
+    [
+      "external-helpers",
+      {
+        "helperVersion": "7.1000.0"
+      }
+    ],
+    "proposal-private-methods",
+    "proposal-class-properties",
+    "transform-block-scoping",
+    "syntax-class-properties"
+  ]
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/set-only-getter/exec.js

@@ -0,0 +1,13 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static setPrivateStaticFieldValue() {
+    Cl.#privateStaticFieldValue = 1;
+  }
+}
+
+expect(() => Cl.setPrivateStaticFieldValue()).toThrow(TypeError);

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/set-only-getter/input.js

@@ -0,0 +1,11 @@
+class Cl {
+  static #PRIVATE_STATIC_FIELD = 0;
+
+  static get #privateStaticFieldValue() {
+    return Cl.#PRIVATE_STATIC_FIELD;
+  }
+
+  static setPrivateStaticFieldValue() {
+    Cl.#privateStaticFieldValue = 1;
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/set-only-getter/output.js

@@ -0,0 +1,19 @@
+class Cl {
+  static setPrivateStaticFieldValue() {
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateStaticFieldValue, 1);
+  }
+
+}
+
+var _get_privateStaticFieldValue = function () {
+  return babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _PRIVATE_STATIC_FIELD);
+};
+
+var _PRIVATE_STATIC_FIELD = {
+  writable: true,
+  value: 0
+};
+var _privateStaticFieldValue = {
+  get: _get_privateStaticFieldValue,
+  set: void 0
+};

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/updates/exec.js

@@ -0,0 +1,46 @@
+class Cl {
+  static #privateField = "top secret string";
+  static publicField = "not secret string";
+
+  static get #privateFieldValue() {
+    return Cl.#privateField;
+  }
+
+  static set #privateFieldValue(newValue) {
+    Cl.#privateField = newValue;
+  }
+
+  static publicGetPrivateField() {
+    return Cl.#privateFieldValue;
+  }
+
+  static publicSetPrivateField(newValue) {
+    Cl.#privateFieldValue = newValue;
+  }
+
+  static get publicFieldValue() {
+    return Cl.publicField;
+  }
+
+  static set publicFieldValue(newValue) {
+    Cl.publicField = newValue;
+  }
+
+  static testUpdates() {
+    Cl.#privateField = 0;
+    Cl.publicField = 0;
+    Cl.#privateFieldValue = Cl.#privateFieldValue++;
+    Cl.publicFieldValue = Cl.publicFieldValue++;
+    expect(Cl.#privateField).toEqual(Cl.publicField);
+
+    ++Cl.#privateFieldValue;
+    ++Cl.publicFieldValue;
+    expect(Cl.#privateField).toEqual(Cl.publicField);
+
+    Cl.#privateFieldValue += 1;
+    Cl.publicFieldValue += 1;
+    expect(Cl.#privateField).toEqual(Cl.publicField);
+  }
+}
+
+Cl.testUpdates();

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/updates/input.js

@@ -0,0 +1,44 @@
+class Cl {
+  static #privateField = "top secret string";
+  static publicField = "not secret string";
+
+  static get #privateFieldValue() {
+    return Cl.#privateField;
+  }
+
+  static set #privateFieldValue(newValue) {
+    Cl.#privateField = newValue;
+  }
+
+  static publicGetPrivateField() {
+    return Cl.#privateFieldValue;
+  }
+
+  static publicSetPrivateField(newValue) {
+    Cl.#privateFieldValue = newValue;
+  }
+
+  static get publicFieldValue() {
+    return Cl.publicField;
+  }
+
+  static set publicFieldValue(newValue) {
+    Cl.publicField = newValue;
+  }
+
+  static testUpdates() {
+    Cl.#privateField = 0;
+    Cl.publicField = 0;
+    Cl.#privateFieldValue = Cl.#privateFieldValue++;
+    Cl.publicFieldValue = Cl.publicFieldValue++;
+
+    ++Cl.#privateFieldValue;
+    ++Cl.publicFieldValue;
+
+    Cl.#privateFieldValue += 1;
+    Cl.publicFieldValue += 1;
+
+    Cl.#privateFieldValue = -(Cl.#privateFieldValue ** Cl.#privateFieldValue);
+    Cl.publicFieldValue = -(Cl.publicFieldValue ** Cl.publicFieldValue);
+  }
+}

packages/babel-plugin-proposal-private-methods/test/fixtures/static-accessors/updates/output.js

@@ -0,0 +1,51 @@
+class Cl {
+  static publicGetPrivateField() {
+    return babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateFieldValue);
+  }
+
+  static publicSetPrivateField(newValue) {
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateFieldValue, newValue);
+  }
+
+  static get publicFieldValue() {
+    return Cl.publicField;
+  }
+
+  static set publicFieldValue(newValue) {
+    Cl.publicField = newValue;
+  }
+
+  static testUpdates() {
+    var _Cl$privateFieldValue, _Cl$privateFieldValue2;
+
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateField, 0);
+    Cl.publicField = 0;
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateFieldValue, (babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateFieldValue, (_Cl$privateFieldValue2 = +babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateFieldValue)) + 1), _Cl$privateFieldValue2));
+    Cl.publicFieldValue = Cl.publicFieldValue++;
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateFieldValue, +babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateFieldValue) + 1);
+    ++Cl.publicFieldValue;
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateFieldValue, babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateFieldValue) + 1);
+    Cl.publicFieldValue += 1;
+    babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateFieldValue, -(babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateFieldValue) ** babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateFieldValue)));
+    Cl.publicFieldValue = -(Cl.publicFieldValue ** Cl.publicFieldValue);
+  }
+
+}
+
+var _set_privateFieldValue = function (newValue) {
+  babelHelpers.classStaticPrivateFieldSpecSet(Cl, Cl, _privateField, newValue);
+};
+
+var _get_privateFieldValue = function () {
+  return babelHelpers.classStaticPrivateFieldSpecGet(Cl, Cl, _privateField);
+};
+
+var _privateField = {
+  writable: true,
+  value: "top secret string"
+};
+babelHelpers.defineProperty(Cl, "publicField", "not secret string");
+var _privateFieldValue = {
+  get: _get_privateFieldValue,
+  set: _set_privateFieldValue
+};