feature/TRI 712/create eslint plugin to ensure uniqueness on task keys (#324)

* test: add test to no-duplicated-task-keys rule

* feat: implement no-duplicated-task-keys

* chore: create testing scripts

* refactor: fill in rule meta

* feat: export no-duplicated-task-keys rule

* chore: bump package version to 0.0.1

* chore: create eslint plugin

* feat: create no-duplicated-task-keys rule

* refactor: delete no-duplicated-task-keys from config-custom

* refactor: rename eslint-plugin folder

* feat: cover case from nextjs-example

* feat: cover additional cases from examples/package-tester

* chore: add eslint-plugin on nextjs-example

* feat: add more cases from `nextjs-example`

* revert: rollback changes on eslint-config-custom

* Set version to 2.0.9, inline with other packages

* Create chilly-pianos-try.md

---------

Co-authored-by: Matt Aitken <[email protected]>

Author: wesleymatosdev

.changeset/chilly-pianos-try.md

@@ -0,0 +1,5 @@
+---
+"@trigger.dev/eslint-plugin": patch
+---
+
+An eslint plugin that ensures uniqueness on task keys

examples/nextjs-example/.eslintrc.json

@@ -1,3 +1,7 @@
 {
-  "extends": "next/core-web-vitals"
+  "extends": ["next/core-web-vitals"],
+  "plugins": ["@trigger.dev"],
+  "rules": {
+    "@trigger.dev/no-duplicated-task-keys": 2
+  }
 }

examples/nextjs-example/package.json

@@ -19,6 +19,7 @@
     "@trigger.dev/sdk": "workspace:*",
     "@trigger.dev/slack": "workspace:*",
     "@trigger.dev/typeform": "workspace:*",
+    "@trigger.dev/eslint-plugin": "workspace:*",
     "@types/node": "18.15.13",
     "@types/react": "18.2.17",
     "@types/react-dom": "18.2.7",

packages/eslint-plugin/.eslintrc.js

@@ -0,0 +1,23 @@
+"use strict";
+
+module.exports = {
+  root: true,
+  extends: [
+    "eslint:recommended",
+    "plugin:eslint-plugin/recommended",
+    "plugin:node/recommended",
+  ],
+  env: {
+    node: true,
+  },
+  overrides: [
+    {
+      files: ["tests/**/*.js"],
+      env: { mocha: true },
+    },
+  ],
+  parserOptions: {
+    sourceType: "module",
+    ecmaVersion: 2020,
+  },
+};

packages/eslint-plugin/README.md

@@ -0,0 +1,52 @@
+# @trigger.dev/eslint-plugin
+
+ESLint plugin with trigger.dev best practices
+
+## Installation
+
+You'll first need to install [ESLint](https://eslint.org/):
+
+```sh
+npm i eslint --save-dev
+```
+
+Next, install `@trigger.dev/eslint-plugin`:
+
+```sh
+npm install @trigger.dev/eslint-plugin --save-dev
+```
+
+## Usage
+
+Add `trigger-dev` to the plugins section of your `.eslintrc` configuration file. You can omit the `eslint-plugin-` prefix:
+
+```json
+{
+    "plugins": [
+        "trigger-dev"
+    ]
+}
+```
+
+
+Then configure the rules you want to use under the rules section.
+
+```json
+{
+    "rules": {
+        "trigger-dev/rule-name": 2
+    }
+}
+```
+
+## Rules
+
+<!-- begin auto-generated rules list -->
+
+| Name                                                             | Description                                      |
+| :--------------------------------------------------------------- | :----------------------------------------------- |
+| [no-duplicated-task-keys](docs/rules/no-duplicated-task-keys.md) | Prevent duplicated task keys on trigger.dev jobs |
+
+<!-- end auto-generated rules list -->
+
+

packages/eslint-plugin/docs/rules/no-duplicated-task-keys.md

@@ -0,0 +1,37 @@
+# Prevent duplicated task keys on trigger.dev jobs (`trigger-dev/no-duplicated-task-keys`)
+
+<!-- end auto-generated rule header -->
+
+Please describe the origin of the rule here.
+
+## Rule Details
+
+This rule aims to...
+
+Examples of **incorrect** code for this rule:
+
+```js
+
+// fill me in
+
+```
+
+Examples of **correct** code for this rule:
+
+```js
+
+// fill me in
+
+```
+
+### Options
+
+If there are any options, describe them here. Otherwise, delete this section.
+
+## When Not To Use It
+
+Give a short description of when it would be appropriate to turn off this rule.
+
+## Further Reading
+
+If there are other links that describe the issue this rule addresses, please include them here in a bulleted list.

packages/eslint-plugin/lib/index.js

@@ -0,0 +1,22 @@
+/**
+ * @fileoverview ESLint plugin with trigger.dev best practices
+ * @author 
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const requireIndex = require("requireindex");
+
+//------------------------------------------------------------------------------
+// Plugin Definition
+//------------------------------------------------------------------------------
+
+
+// import all rules in lib/rules
+module.exports.rules = requireIndex(__dirname + "/rules");
+
+
+

packages/eslint-plugin/lib/rules/no-duplicated-task-keys.js

@@ -0,0 +1,110 @@
+/**
+ * @fileoverview Prevent duplicated task keys on trigger.dev jobs
+ * @author 
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+/** @type {import('eslint').Rule.RuleModule} */
+module.exports = {
+  meta: {
+    type: 'problem', // `problem`, `suggestion`, or `layout`
+    docs: {
+      description: "Prevent duplicated task keys on trigger.dev jobs",
+      recommended: true,
+      url: null, // URL to the documentation page for this rule
+    },
+    fixable: null, // Or `code` or `whitespace`
+    schema: [], // Add a schema if the rule has options
+    messages: {
+      duplicatedTaskKey: "Task key '{{taskKey}}' is duplicated"
+    }
+  },
+
+  create(context) {
+    const getArguments = (node) => node.arguments || node.argument.arguments;
+
+    const getKey = (node) => {
+      const args = getArguments(node);
+
+      const key = args.find((arg) => arg.type === 'Literal');
+
+      if (!key) return;
+
+      return key.value;
+    }
+
+    const getTaskName = (expression) => {
+      const callee = expression.callee || expression.argument.callee;
+
+      const property = callee.property;
+
+      // We need property to be an Identifier, otherwise it's not a task
+      if (property.type !== 'Identifier') return;
+
+      // for io.slack.postMessage, postMessage
+      return property.name;
+    }
+
+    const groupExpressionsByTask = (ExpressionStatements, map = new Map()) => ExpressionStatements.reduce((acc, { expression }) => {
+      const taskName = getTaskName(expression);
+      const taskKey = getKey(expression);
+
+      if (acc.has(taskName)) {
+        acc.get(taskName).push(taskKey);
+      } else {
+        acc.set(taskName, [taskKey]);
+      }
+
+      return acc;
+    }, map);
+
+    const groupVariableDeclarationsByTask = VariableDeclarations => VariableDeclarations.reduce((acc, { declarations }) => {
+      declarations.forEach((declaration) => {
+        if (!['AwaitExpression', 'CallExpression'].includes(declaration.init.type)) return;
+
+        const taskName = getTaskName(declaration.init);
+        
+        const taskKey = getKey(declaration.init);
+
+        if (acc.has(taskName)) {
+          acc.get(taskName).push(taskKey);
+        } else {
+          acc.set(taskName, [taskKey]);
+        }
+      });
+
+      return acc;
+    }, new Map());
+
+    return {
+      "CallExpression[callee.property.name='defineJob'] ObjectExpression BlockStatement": (node) => {
+        const VariableDeclarations = node.body.filter((arg) => arg.type === 'VariableDeclaration');
+
+        const grouped = groupVariableDeclarationsByTask(VariableDeclarations);
+
+        const ExpressionStatements = node.body.filter((arg) => arg.type === 'ExpressionStatement');
+
+        // it'll be a map of taskName => [key1, key2, ...]
+        const groupedByTask = groupExpressionsByTask(ExpressionStatements, grouped);
+
+        groupedByTask.forEach((keys) => {
+          const duplicated = keys.find((key, index) => keys.indexOf(key) !== index);
+
+          if (duplicated) {
+            context.report({
+              node,
+              messageId: 'duplicatedTaskKey',
+              data: {
+                taskKey: duplicated
+              },
+            });
+          }
+        })
+      }
+    }
+  }
+};

packages/eslint-plugin/package.json

@@ -0,0 +1,38 @@
+{
+  "name": "@trigger.dev/eslint-plugin",
+  "version": "2.0.9",
+  "description": "ESLint plugin with trigger.dev best practices",
+  "keywords": [
+    "eslint",
+    "eslintplugin",
+    "eslint-plugin"
+  ],
+  "author": "",
+  "main": "./lib/index.js",
+  "exports": "./lib/index.js",
+  "scripts": {
+    "lint": "npm-run-all \"lint:*\"",
+    "lint:eslint-docs": "npm-run-all \"update:eslint-docs -- --check\"",
+    "lint:js": "eslint .",
+    "test": "mocha tests --recursive",
+    "update:eslint-docs": "eslint-doc-generator"
+  },
+  "dependencies": {
+    "requireindex": "^1.2.0"
+  },
+  "devDependencies": {
+    "eslint": "^8.19.0",
+    "eslint-doc-generator": "^1.0.0",
+    "eslint-plugin-eslint-plugin": "^5.0.0",
+    "eslint-plugin-node": "^11.1.0",
+    "mocha": "^10.0.0",
+    "npm-run-all": "^4.1.5"
+  },
+  "engines": {
+    "node": "^14.17.0 || ^16.0.0 || >= 18.0.0"
+  },
+  "peerDependencies": {
+    "eslint": ">=7"
+  },
+  "license": "ISC"
+}