Update: Handle locally unsupported regex in computed property keys

lib/rules/utils/ast-utils.js

@@ -865,6 +865,44 @@ module.exports = {
         return isFunction(node) && module.exports.isEmptyBlock(node.body);
     },
 
+    /**
+     * Returns the result of the string conversion applied to the evaluated value of the given expression node,
+     * if it can be determined statically.
+     *
+     * This function returns a `string` value for all `Literal` nodes and simple `TemplateLiteral` nodes only.
+     * In all other cases, this function returns `null`.
+     * @param {ASTNode} node Expression node.
+     * @returns {string|null} String value if it can be determined. Otherwise, `null`.
+     */
+    getStaticStringValue(node) {
+        switch (node.type) {
+            case "Literal":
+                if (node.value === null) {
+                    if (module.exports.isNullLiteral(node)) {
+                        return String(node.value); // "null"
+                    }
+                    if (node.regex) {
+                        return `/${node.regex.pattern}/${node.regex.flags}`;
+                    }
+
+                    // Otherwise, this is an unknown literal. The function will return null.
+
+                } else {
+                    return String(node.value);
+                }
+                break;
+            case "TemplateLiteral":
+                if (node.expressions.length === 0 && node.quasis.length === 1) {
+                    return node.quasis[0].value.cooked;
+                }
+                break;
+
+            // no default
+        }
+
+        return null;
+    },
+
     /**
      * Gets the property name of a given node.
      * The node can be a MemberExpression, a Property, or a MethodDefinition.
@@ -911,23 +949,12 @@ module.exports = {
             // no default
         }
 
-        switch (prop && prop.type) {
-            case "Literal":
-                return String(prop.value);
-
-            case "TemplateLiteral":
-                if (prop.expressions.length === 0 && prop.quasis.length === 1) {
-                    return prop.quasis[0].value.cooked;
-                }
-                break;
-
-            case "Identifier":
-                if (!node.computed) {
-                    return prop.name;
-                }
-                break;
+        if (prop) {
+            if (prop.type === "Identifier" && !node.computed) {
+                return prop.name;
+            }
 
-            // no default
+            return module.exports.getStaticStringValue(prop);
         }
 
         return null;

tests/lib/rules/no-dupe-keys.js

@@ -32,6 +32,7 @@ ruleTester.run("no-dupe-keys", rule, {
         { code: "var x = { a: b, ...c }", parserOptions: { ecmaVersion: 2018 } },
         { code: "var x = { get a() {}, set a (value) {} };", parserOptions: { ecmaVersion: 6 } },
         { code: "var x = { a: 1, b: { a: 2 } };", parserOptions: { ecmaVersion: 6 } },
+        { code: "var x = ({ null: 1, [/(?<zero>0)/]: 2 })", parserOptions: { ecmaVersion: 2018 } },
         { code: "var {a, a} = obj", parserOptions: { ecmaVersion: 6 } }
     ],
     invalid: [
@@ -44,6 +45,7 @@ ruleTester.run("no-dupe-keys", rule, {
         { code: "var foo = {\n  bar: 1,\n  bar: 1,\n}", errors: [{ messageId: "unexpected", data: { name: "bar" }, line: 3, column: 3 }] },
         { code: "var x = { a: 1, get a() {} };", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpected", data: { name: "a" }, type: "ObjectExpression" }] },
         { code: "var x = { a: 1, set a(value) {} };", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpected", data: { name: "a" }, type: "ObjectExpression" }] },
-        { code: "var x = { a: 1, b: { a: 2 }, get b() {} };", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpected", data: { name: "b" }, type: "ObjectExpression" }] }
+        { code: "var x = { a: 1, b: { a: 2 }, get b() {} };", parserOptions: { ecmaVersion: 6 }, errors: [{ messageId: "unexpected", data: { name: "b" }, type: "ObjectExpression" }] },
+        { code: "var x = ({ '/(?<zero>0)/': 1, [/(?<zero>0)/]: 2 })", parserOptions: { ecmaVersion: 2018 }, errors: [{ messageId: "unexpected", data: { name: "/(?<zero>0)/" }, type: "ObjectExpression" }] }
     ]
 });

tests/lib/rules/no-restricted-properties.js

@@ -95,6 +95,12 @@ ruleTester.run("no-restricted-properties", rule, {
             options: [{
                 object: "foo"
             }]
+        }, {
+            code: "foo[/(?<zero>0)/]",
+            options: [{
+                property: "null"
+            }],
+            parserOptions: { ecmaVersion: 2018 }
         }, {
             code: "let bar = foo;",
             options: [{ object: "foo", property: "bar" }],
@@ -248,6 +254,11 @@ ruleTester.run("no-restricted-properties", rule, {
             code: "foo.bar.baz();",
             options: [{ property: "bar" }],
             errors: [{ message: "'bar' is restricted from being used.", type: "MemberExpression" }]
+        }, {
+            code: "foo[/(?<zero>0)/]",
+            options: [{ property: "/(?<zero>0)/" }],
+            parserOptions: { ecmaVersion: 2018 },
+            errors: [{ message: "'/(?<zero>0)/' is restricted from being used.", type: "MemberExpression" }]
         }, {
             code: "require.call({}, 'foo')",
             options: [{

tests/lib/rules/no-self-assign.js

@@ -50,6 +50,7 @@ ruleTester.run("no-self-assign", rule, {
         { code: "a[b] = a.b", options: [{ props: true }] },
         { code: "a.b().c = a.b().c", options: [{ props: true }] },
         { code: "b().c = b().c", options: [{ props: true }] },
+        { code: "a.null = a[/(?<zero>0)/]", options: [{ props: true }], parserOptions: { ecmaVersion: 2018 } },
         { code: "a[b + 1] = a[b + 1]", options: [{ props: true }] }, // it ignores non-simple computed properties.
         {
             code: "a.b = a.b",
@@ -133,6 +134,7 @@ ruleTester.run("no-self-assign", rule, {
             code: "this.x = this.x",
             options: [{ props: true }],
             errors: ["'this.x' is assigned to itself."]
-        }
+        },
+        { code: "a['/(?<zero>0)/'] = a[/(?<zero>0)/]", options: [{ props: true }], parserOptions: { ecmaVersion: 2018 }, errors: ["'a[/(?<zero>0)/]' is assigned to itself."] }
     ]
 });

tests/lib/rules/sort-keys.js

@@ -33,6 +33,7 @@ ruleTester.run("sort-keys", rule, {
         { code: "var obj = {$:1, A:3, _:2, a:4}", options: [] },
         { code: "var obj = {1:1, '11':2, 2:4, A:3}", options: [] },
         { code: "var obj = {'#':1, 'Z':2, À:3, è:4}", options: [] },
+        { code: "var obj = { [/(?<zero>0)/]: 1, '/(?<zero>0)/': 2 }", options: [], parserOptions: { ecmaVersion: 2018 } },
 
         // ignore non-simple computed properties.
         { code: "var obj = {a:1, b:3, [a + b]: -1, c:2}", options: [], parserOptions: { ecmaVersion: 6 } },
@@ -204,6 +205,11 @@ ruleTester.run("sort-keys", rule, {
             code: "var obj = {'#':1, À:3, 'Z':2, è:4}",
             errors: ["Expected object keys to be in ascending order. 'Z' should be before 'À'."]
         },
+        {
+            code: "var obj = { null: 1, [/(?<zero>0)/]: 2 }",
+            parserOptions: { ecmaVersion: 2018 },
+            errors: ["Expected object keys to be in ascending order. '/(?<zero>0)/' should be before 'null'."]
+        },
 
         // not ignore properties not separated by spread properties
         {

tests/lib/rules/utils/ast-utils.js

@@ -403,6 +403,83 @@ describe("ast-utils", () => {
         });
     });
 
+    describe("getStaticStringValue", () => {
+
+        /* eslint-disable quote-props */
+        const expectedResults = {
+
+            // string literals
+            "''": "",
+            "'foo'": "foo",
+
+            // boolean literals
+            "false": "false",
+            "true": "true",
+
+            // null literal
+            "null": "null",
+
+            // number literals
+            "0": "0",
+            "0.": "0",
+            ".0": "0",
+            "1": "1",
+            "1.": "1",
+            ".1": "0.1",
+            "12": "12",
+            ".12": "0.12",
+            "0.12": "0.12",
+            "12.34": "12.34",
+            "12e3": "12000",
+            "12e-3": "0.012",
+            "12.34e5": "1234000",
+            "12.34e-5": "0.0001234",
+            "011": "9",
+            "081": "81",
+            "0b11": "3",
+            "0b011": "3",
+            "0o11": "9",
+            "0o011": "9",
+            "0x11": "17",
+            "0x011": "17",
+
+            // regexp literals
+            "/a/": "/a/",
+            "/a/i": "/a/i",
+            "/[0-9]/": "/[0-9]/",
+            "/(?<zero>0)/": "/(?<zero>0)/",
+            "/(?<zero>0)/s": "/(?<zero>0)/s",
+            "/(?<=a)b/s": "/(?<=a)b/s",
+
+            // simple template literals
+            "``": "",
+            "`foo`": "foo",
+
+            // unsupported
+            "`${''}`": null,
+            "`${0}`": null,
+            "tag``": null,
+            "-0": null,
+            "-1": null,
+            "1 + 2": null,
+            "[]": null,
+            "({})": null,
+            "foo": null,
+            "undefined": null,
+            "this": null,
+            "(function () {})": null
+        };
+        /* eslint-enable quote-props */
+
+        Object.keys(expectedResults).forEach(key => {
+            it(`should return ${expectedResults[key]} for ${key}`, () => {
+                const ast = espree.parse(key, { ecmaVersion: 2018 });
+
+                assert.strictEqual(astUtils.getStaticStringValue(ast.body[0].expression), expectedResults[key]);
+            });
+        });
+    });
+
     describe("getStaticPropertyName", () => {
         it("should return 'b' for `a.b`", () => {
             const ast = espree.parse("a.b");
@@ -509,6 +586,13 @@ describe("ast-utils", () => {
             assert.strictEqual(astUtils.getStaticPropertyName(node), "100");
         });
 
+        it("should return '/(?<zero>0)/' for `[/(?<zero>0)/]: 1`", () => {
+            const ast = espree.parse("({[/(?<zero>0)/]: 1})", { ecmaVersion: 2018 });
+            const node = ast.body[0].expression.properties[0];
+
+            assert.strictEqual(astUtils.getStaticPropertyName(node), "/(?<zero>0)/");
+        });
+
         it("should return null for `[b]: 1`", () => {
             const ast = espree.parse("({[b]: 1})", { ecmaVersion: 6 });
             const node = ast.body[0].expression.properties[0];

tests/lib/rules/yoda.js

@@ -91,6 +91,10 @@ ruleTester.run("yoda", rule, {
         }, {
             code: "if (0 <= a.b && a[\"b\"] <= 100) {}",
             options: ["never", { exceptRange: true }]
+        }, {
+            code: "if (1 <= a['/(?<zero>0)/'] && a[/(?<zero>0)/] <= 100) {}",
+            options: ["never", { exceptRange: true }],
+            parserOptions: { ecmaVersion: 2018 }
         },
 
         // onlyEquality
@@ -412,6 +416,19 @@ ruleTester.run("yoda", rule, {
                 }
             ]
         },
+        {
+            code: "if (0 <= a.null && a[/(?<zero>0)/] <= 1) {}",
+            output: "if (a.null >= 0 && a[/(?<zero>0)/] <= 1) {}",
+            options: ["never", { exceptRange: true }],
+            parserOptions: { ecmaVersion: 2018 },
+            errors: [
+                {
+                    messageId: "expected",
+                    data: { expectedSide: "right", operator: "<=" },
+                    type: "BinaryExpression"
+                }
+            ]
+        },
         {
             code: "if (3 == a) {}",
             output: "if (a == 3) {}",