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app_vue/node_modules/eslint/lib/rules/max-nested-callbacks.js

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+/**
+ * @fileoverview Rule to enforce a maximum number of nested callbacks.
+ * @author Ian Christian Myers
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "enforce a maximum depth that callbacks can be nested",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/max-nested-callbacks"
+        },
+
+        schema: [
+            {
+                oneOf: [
+                    {
+                        type: "integer",
+                        minimum: 0
+                    },
+                    {
+                        type: "object",
+                        properties: {
+                            maximum: {
+                                type: "integer",
+                                minimum: 0
+                            },
+                            max: {
+                                type: "integer",
+                                minimum: 0
+                            }
+                        },
+                        additionalProperties: false
+                    }
+                ]
+            }
+        ],
+        messages: {
+            exceed: "Too many nested callbacks ({{num}}). Maximum allowed is {{max}}."
+        }
+    },
+
+    create(context) {
+
+        //--------------------------------------------------------------------------
+        // Constants
+        //--------------------------------------------------------------------------
+        const option = context.options[0];
+        let THRESHOLD = 10;
+
+        if (
+            typeof option === "object" &&
+            (Object.prototype.hasOwnProperty.call(option, "maximum") || Object.prototype.hasOwnProperty.call(option, "max"))
+        ) {
+            THRESHOLD = option.maximum || option.max;
+        } else if (typeof option === "number") {
+            THRESHOLD = option;
+        }
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        const callbackStack = [];
+
+        /**
+         * Checks a given function node for too many callbacks.
+         * @param {ASTNode} node The node to check.
+         * @returns {void}
+         * @private
+         */
+        function checkFunction(node) {
+            const parent = node.parent;
+
+            if (parent.type === "CallExpression") {
+                callbackStack.push(node);
+            }
+
+            if (callbackStack.length > THRESHOLD) {
+                const opts = { num: callbackStack.length, max: THRESHOLD };
+
+                context.report({ node, messageId: "exceed", data: opts });
+            }
+        }
+
+        /**
+         * Pops the call stack.
+         * @returns {void}
+         * @private
+         */
+        function popStack() {
+            callbackStack.pop();
+        }
+
+        //--------------------------------------------------------------------------
+        // Public API
+        //--------------------------------------------------------------------------
+
+        return {
+            ArrowFunctionExpression: checkFunction,
+            "ArrowFunctionExpression:exit": popStack,
+
+            FunctionExpression: checkFunction,
+            "FunctionExpression:exit": popStack
+        };
+
+    }
+};