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app_vue/node_modules/eslint/lib/rules/guard-for-in.js

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+/**
+ * @fileoverview Rule to flag for-in loops without if statements inside
+ * @author Nicholas C. Zakas
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "require `for-in` loops to include an `if` statement",
+            category: "Best Practices",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/guard-for-in"
+        },
+
+        schema: [],
+        messages: {
+            wrap: "The body of a for-in should be wrapped in an if statement to filter unwanted properties from the prototype."
+        }
+    },
+
+    create(context) {
+
+        return {
+
+            ForInStatement(node) {
+                const body = node.body;
+
+                // empty statement
+                if (body.type === "EmptyStatement") {
+                    return;
+                }
+
+                // if statement
+                if (body.type === "IfStatement") {
+                    return;
+                }
+
+                // empty block
+                if (body.type === "BlockStatement" && body.body.length === 0) {
+                    return;
+                }
+
+                // block with just if statement
+                if (body.type === "BlockStatement" && body.body.length === 1 && body.body[0].type === "IfStatement") {
+                    return;
+                }
+
+                // block that starts with if statement
+                if (body.type === "BlockStatement" && body.body.length >= 1 && body.body[0].type === "IfStatement") {
+                    const i = body.body[0];
+
+                    // ... whose consequent is a continue
+                    if (i.consequent.type === "ContinueStatement") {
+                        return;
+                    }
+
+                    // ... whose consequent is a block that contains only a continue
+                    if (i.consequent.type === "BlockStatement" && i.consequent.body.length === 1 && i.consequent.body[0].type === "ContinueStatement") {
+                        return;
+                    }
+                }
+
+                context.report({ node, messageId: "wrap" });
+            }
+        };
+
+    }
+};