Installing dependencies.

node_modules/eslint-plugin-jest/lib/rules/no-duplicate-hooks.js

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+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = void 0;
+
+var _utils = require("./utils");
+
+var _default = (0, _utils.createRule)({
+  name: __filename,
+  meta: {
+    docs: {
+      category: 'Best Practices',
+      description: 'Disallow duplicate setup and teardown hooks',
+      recommended: false
+    },
+    messages: {
+      noDuplicateHook: 'Duplicate {{hook}} in describe block'
+    },
+    schema: [],
+    type: 'suggestion'
+  },
+  defaultOptions: [],
+
+  create(context) {
+    const hookContexts = [{}];
+    return {
+      CallExpression(node) {
+        var _jestFnCall$name;
+
+        const jestFnCall = (0, _utils.parseJestFnCall)(node, context);
+
+        if ((jestFnCall === null || jestFnCall === void 0 ? void 0 : jestFnCall.type) === 'describe') {
+          hookContexts.push({});
+        }
+
+        if ((jestFnCall === null || jestFnCall === void 0 ? void 0 : jestFnCall.type) !== 'hook') {
+          return;
+        }
+
+        const currentLayer = hookContexts[hookContexts.length - 1];
+        currentLayer[_jestFnCall$name = jestFnCall.name] || (currentLayer[_jestFnCall$name] = 0);
+        currentLayer[jestFnCall.name] += 1;
+
+        if (currentLayer[jestFnCall.name] > 1) {
+          context.report({
+            messageId: 'noDuplicateHook',
+            data: {
+              hook: jestFnCall.name
+            },
+            node
+          });
+        }
+      },
+
+      'CallExpression:exit'(node) {
+        if ((0, _utils.isTypeOfJestFnCall)(node, context, ['describe'])) {
+          hookContexts.pop();
+        }
+      }
+
+    };
+  }
+
+});
+
+exports.default = _default;