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app_vue/node_modules/eslint/lib/rules/new-parens.js

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+/**
+ * @fileoverview Rule to flag when using constructor without parentheses
+ * @author Ilya Volodin
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Helpers
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce or disallow parentheses when invoking a constructor with no arguments",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/new-parens"
+        },
+
+        fixable: "code",
+        schema: {
+            anyOf: [
+                {
+                    type: "array",
+                    items: [
+                        {
+                            enum: ["always", "never"]
+                        }
+                    ],
+                    minItems: 0,
+                    maxItems: 1
+                }
+            ]
+        },
+        messages: {
+            missing: "Missing '()' invoking a constructor.",
+            unnecessary: "Unnecessary '()' invoking a constructor with no arguments."
+        }
+    },
+
+    create(context) {
+        const options = context.options;
+        const always = options[0] !== "never"; // Default is always
+
+        const sourceCode = context.getSourceCode();
+
+        return {
+            NewExpression(node) {
+                if (node.arguments.length !== 0) {
+                    return; // if there are arguments, there have to be parens
+                }
+
+                const lastToken = sourceCode.getLastToken(node);
+                const hasLastParen = lastToken && astUtils.isClosingParenToken(lastToken);
+
+                // `hasParens` is true only if the new expression ends with its own parens, e.g., new new foo() does not end with its own parens
+                const hasParens = hasLastParen &&
+                    astUtils.isOpeningParenToken(sourceCode.getTokenBefore(lastToken)) &&
+                    node.callee.range[1] < node.range[1];
+
+                if (always) {
+                    if (!hasParens) {
+                        context.report({
+                            node,
+                            messageId: "missing",
+                            fix: fixer => fixer.insertTextAfter(node, "()")
+                        });
+                    }
+                } else {
+                    if (hasParens) {
+                        context.report({
+                            node,
+                            messageId: "unnecessary",
+                            fix: fixer => [
+                                fixer.remove(sourceCode.getTokenBefore(lastToken)),
+                                fixer.remove(lastToken),
+                                fixer.insertTextBefore(node, "("),
+                                fixer.insertTextAfter(node, ")")
+                            ]
+                        });
+                    }
+                }
+            }
+        };
+    }
+};