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node_modules/eslint/lib/rules/no-template-curly-in-string.js

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+/**
+ * @fileoverview Warn when using template string syntax in regular strings
+ * @author Jeroen Engels
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "problem",
+
+        docs: {
+            description: "disallow template literal placeholder syntax in regular strings",
+            category: "Possible Errors",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/no-template-curly-in-string"
+        },
+
+        schema: []
+    },
+
+    create(context) {
+        const regex = /\$\{[^}]+\}/u;
+
+        return {
+            Literal(node) {
+                if (typeof node.value === "string" && regex.test(node.value)) {
+                    context.report({
+                        node,
+                        message: "Unexpected template string expression."
+                    });
+                }
+            }
+        };
+
+    }
+};