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node_modules/eslint/lib/rules/no-useless-catch.js

@@ -0,0 +1,57 @@
+/**
+ * @fileoverview Reports useless `catch` clauses that just rethrow their error.
+ * @author Teddy Katz
+ */
+
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "suggestion",
+
+        docs: {
+            description: "disallow unnecessary `catch` clauses",
+            category: "Best Practices",
+            recommended: true,
+            url: "https://eslint.org/docs/rules/no-useless-catch"
+        },
+
+        schema: [],
+
+        messages: {
+            unnecessaryCatchClause: "Unnecessary catch clause.",
+            unnecessaryCatch: "Unnecessary try/catch wrapper."
+        }
+    },
+
+    create(context) {
+        return {
+            CatchClause(node) {
+                if (
+                    node.param &&
+                    node.param.type === "Identifier" &&
+                    node.body.body.length &&
+                    node.body.body[0].type === "ThrowStatement" &&
+                    node.body.body[0].argument.type === "Identifier" &&
+                    node.body.body[0].argument.name === node.param.name
+                ) {
+                    if (node.parent.finalizer) {
+                        context.report({
+                            node,
+                            messageId: "unnecessaryCatchClause"
+                        });
+                    } else {
+                        context.report({
+                            node: node.parent,
+                            messageId: "unnecessaryCatch"
+                        });
+                    }
+                }
+            }
+        };
+    }
+};