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app_vue/node_modules/eslint/lib/rules/prefer-rest-params.js

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+/**
+ * @fileoverview Rule to
+ * @author Toru Nagashima
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Gets the variable object of `arguments` which is defined implicitly.
+ * @param {eslint-scope.Scope} scope A scope to get.
+ * @returns {eslint-scope.Variable} The found variable object.
+ */
+function getVariableOfArguments(scope) {
+    const variables = scope.variables;
+
+    for (let i = 0; i < variables.length; ++i) {
+        const variable = variables[i];
+
+        if (variable.name === "arguments") {
+
+            /*
+             * If there was a parameter which is named "arguments", the implicit "arguments" is not defined.
+             * So does fast return with null.
+             */
+            return (variable.identifiers.length === 0) ? variable : null;
+        }
+    }
+
+    /* istanbul ignore next : unreachable */
+    return null;
+}
+
+/**
+ * Checks if the given reference is not normal member access.
+ *
+ * - arguments         .... true    // not member access
+ * - arguments[i]      .... true    // computed member access
+ * - arguments[0]      .... true    // computed member access
+ * - arguments.length  .... false   // normal member access
+ * @param {eslint-scope.Reference} reference The reference to check.
+ * @returns {boolean} `true` if the reference is not normal member access.
+ */
+function isNotNormalMemberAccess(reference) {
+    const id = reference.identifier;
+    const parent = id.parent;
+
+    return !(
+        parent.type === "MemberExpression" &&
+        parent.object === id &&
+        !parent.computed
+    );
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require rest parameters instead of `arguments`",
+            category: "ECMAScript 6",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/prefer-rest-params"
+        },
+
+        schema: [],
+
+        messages: {
+            preferRestParams: "Use the rest parameters instead of 'arguments'."
+        }
+    },
+
+    create(context) {
+
+        /**
+         * Reports a given reference.
+         * @param {eslint-scope.Reference} reference A reference to report.
+         * @returns {void}
+         */
+        function report(reference) {
+            context.report({
+                node: reference.identifier,
+                loc: reference.identifier.loc,
+                messageId: "preferRestParams"
+            });
+        }
+
+        /**
+         * Reports references of the implicit `arguments` variable if exist.
+         * @returns {void}
+         */
+        function checkForArguments() {
+            const argumentsVar = getVariableOfArguments(context.getScope());
+
+            if (argumentsVar) {
+                argumentsVar
+                    .references
+                    .filter(isNotNormalMemberAccess)
+                    .forEach(report);
+            }
+        }
+
+        return {
+            "FunctionDeclaration:exit": checkForArguments,
+            "FunctionExpression:exit": checkForArguments
+        };
+    }
+};