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app_vue/node_modules/eslint/lib/rules/no-plusplus.js

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+/**
+ * @fileoverview Rule to flag use of unary increment and decrement operators.
+ * @author Ian Christian Myers
+ * @author Brody McKee (github.com/mrmckeb)
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+/**
+ * Determines whether the given node is the update node of a `ForStatement`.
+ * @param {ASTNode} node The node to check.
+ * @returns {boolean} `true` if the node is `ForStatement` update.
+ */
+function isForStatementUpdate(node) {
+    const parent = node.parent;
+
+    return parent.type === "ForStatement" && parent.update === node;
+}
+
+/**
+ * Determines whether the given node is considered to be a for loop "afterthought" by the logic of this rule.
+ * In particular, it returns `true` if the given node is either:
+ *   - The update node of a `ForStatement`: for (;; i++) {}
+ *   - An operand of a sequence expression that is the update node: for (;; foo(), i++) {}
+ *   - An operand of a sequence expression that is child of another sequence expression, etc.,
+ *     up to the sequence expression that is the update node: for (;; foo(), (bar(), (baz(), i++))) {}
+ * @param {ASTNode} node The node to check.
+ * @returns {boolean} `true` if the node is a for loop afterthought.
+ */
+function isForLoopAfterthought(node) {
+    const parent = node.parent;
+
+    if (parent.type === "SequenceExpression") {
+        return isForLoopAfterthought(parent);
+    }
+
+    return isForStatementUpdate(node);
+}
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "disallow the unary operators `++` and `--`",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/no-plusplus"
+        },
+
+        schema: [
+            {
+                type: "object",
+                properties: {
+                    allowForLoopAfterthoughts: {
+                        type: "boolean",
+                        default: false
+                    }
+                },
+                additionalProperties: false
+            }
+        ],
+
+        messages: {
+            unexpectedUnaryOp: "Unary operator '{{operator}}' used."
+        }
+    },
+
+    create(context) {
+
+        const config = context.options[0];
+        let allowForLoopAfterthoughts = false;
+
+        if (typeof config === "object") {
+            allowForLoopAfterthoughts = config.allowForLoopAfterthoughts === true;
+        }
+
+        return {
+
+            UpdateExpression(node) {
+                if (allowForLoopAfterthoughts && isForLoopAfterthought(node)) {
+                    return;
+                }
+
+                context.report({
+                    node,
+                    messageId: "unexpectedUnaryOp",
+                    data: {
+                        operator: node.operator
+                    }
+                });
+            }
+
+        };
+
+    }
+};