ags

home/ags/node_modules/eslint-plugin-es-x/lib/rules/no-optional-chaining.js

@@ -0,0 +1,62 @@
+/**
+ * @author Yosuke Ota <https://github.com/ota-meshi>
+ * See LICENSE file in root directory for full license.
+ */
+"use strict"
+
+const { getSourceCode } = require("eslint-compat-utils")
+
+module.exports = {
+    meta: {
+        docs: {
+            description: "disallow optional chaining.",
+            category: "ES2020",
+            recommended: false,
+            url: "http://eslint-community.github.io/eslint-plugin-es-x/rules/no-optional-chaining.html",
+        },
+        fixable: null,
+        messages: {
+            forbidden: "ES2020 optional chaining is forbidden.",
+        },
+        schema: [],
+        type: "problem",
+    },
+    create(context) {
+        const sourceCode = getSourceCode(context)
+
+        /**
+         * Checks if the given token is a `?.` token or not.
+         * @param {Token} token The token to check.
+         * @returns {boolean} `true` if the token is a `?.` token.
+         */
+        function isQuestionDotToken(token) {
+            return (
+                token.value === "?." &&
+                (token.type === "Punctuator" || // espree has been parsed well.
+                    // espree@7.1.0 doesn't parse "?." tokens well. Therefore, get the string from the source code and check it.
+                    sourceCode.getText(token) === "?.")
+            )
+        }
+
+        return {
+            "CallExpression[optional=true]"(node) {
+                context.report({
+                    node: sourceCode.getTokenAfter(
+                        node.callee,
+                        isQuestionDotToken,
+                    ),
+                    messageId: "forbidden",
+                })
+            },
+            "MemberExpression[optional=true]"(node) {
+                context.report({
+                    node: sourceCode.getTokenAfter(
+                        node.object,
+                        isQuestionDotToken,
+                    ),
+                    messageId: "forbidden",
+                })
+            },
+        }
+    },
+}