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node_modules/eslint/lib/rules/no-func-assign.js

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+/**
+ * @fileoverview Rule to flag use of function declaration identifiers as variables.
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "disallow reassigning `function` declarations",
+            category: "Possible Errors",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-func-assign"
+        },
+
+        schema: []
+    },
+
+    create(context) {
+
+        /**
+         * Reports a reference if is non initializer and writable.
+         * @param {References} references Collection of reference to check.
+         * @returns {void}
+         */
+        function checkReference(references) {
+            astUtils.getModifyingReferences(references).forEach(reference => {
+                context.report({ node: reference.identifier, message: "'{{name}}' is a function.", data: { name: reference.identifier.name } });
+            });
+        }
+
+        /**
+         * Finds and reports references that are non initializer and writable.
+         * @param {Variable} variable A variable to check.
+         * @returns {void}
+         */
+        function checkVariable(variable) {
+            if (variable.defs[0].type === "FunctionName") {
+                checkReference(variable.references);
+            }
+        }
+
+        /**
+         * Checks parameters of a given function node.
+         * @param {ASTNode} node A function node to check.
+         * @returns {void}
+         */
+        function checkForFunction(node) {
+            context.getDeclaredVariables(node).forEach(checkVariable);
+        }
+
+        return {
+            FunctionDeclaration: checkForFunction,
+            FunctionExpression: checkForFunction
+        };
+    }
+};