feat(tsl-module): add noDuplicateImport rule to disallow duplicate imports

chore(tsl-module): initialize package.json and add necessary configurations

feat(tsl-module): implement no-duplicate-import rule logic

docs(tsl-module): add README and documentation for noDuplicateImport variable

chore(tsl-module): add TypeScript configuration and build scripts

chore: update tsdown to version 0.19.0-beta.2 in pnpm-lock.yaml

Author: Rel1cx

.pkgs/function-rules/package.json

@@ -25,7 +25,7 @@
   },
   "devDependencies": {
     "eslint": "^9.39.2",
-    "tsdown": "^0.19.0-beta.1"
+    "tsdown": "^0.19.0-beta.2"
   },
   "peerDependencies": {
     "eslint": "^9.39.2",

package.json

@@ -12,7 +12,7 @@
     "url": "git+https://github.com/Rel1cx/dx.git"
   },
   "license": "MIT",
-  "author": "Rel1cx<rel1cx@proton.me>",
+  "author": "Rel1cx<let@ik.me>",
   "type": "module",
   "scripts": {
     "build": "pnpm run build:pkgs && pnpm run build:packages",
@@ -52,7 +52,7 @@
     "sort-package-json": "^3.6.0",
     "tinyglobby": "^0.2.15",
     "ts-pattern": "^5.9.0",
-    "tsdown": "^0.19.0-beta.1",
+    "tsdown": "^0.19.0-beta.2",
     "tsx": "^4.21.0",
     "typedoc": "^0.28.15",
     "typedoc-plugin-markdown": "^4.9.0",

packages/eff/package.json

@@ -11,7 +11,7 @@
     "url": "git+https://github.com/Rel1cx/dx.git"
   },
   "license": "MIT",
-  "author": "Rel1cx<rel1cx@proton.me>",
+  "author": "Rel1cx<let@ik.me>",
   "type": "module",
   "exports": {
     ".": "./dist/index.js",

packages/eslint-plugin-function-rule/package.json

@@ -11,7 +11,7 @@
     "url": "git+https://github.com/Rel1cx/dx.git"
   },
   "license": "MIT",
-  "author": "Rel1cx<rel1cx@proton.me>",
+  "author": "Rel1cx<let@ik.me>",
   "sideEffects": false,
   "type": "module",
   "exports": {

packages/eslint-plugin-function/package.json

@@ -12,7 +12,7 @@
     "url": "git+https://github.com/Rel1cx/dx.git"
   },
   "license": "MIT",
-  "author": "Rel1cx<rel1cx@proton.me>",
+  "author": "Rel1cx<let@ik.me>",
   "sideEffects": false,
   "type": "module",
   "exports": {
@@ -49,7 +49,7 @@
     "@typescript-eslint/rule-tester": "^8.51.0",
     "dedent": "^1.7.1",
     "eslint": "^9.39.2",
-    "tsdown": "^0.19.0-beta.1"
+    "tsdown": "^0.19.0-beta.2"
   },
   "peerDependencies": {
     "eslint": "^9.39.2",

packages/tsl-module/docs/README.md

@@ -0,0 +1,7 @@
+# tsl-module
+
+## Variables
+
+| Variable | Description |
+| ------ | ------ |
+| [noDuplicateImport](variables/noDuplicateImport.md) | Rule to disallow duplicate imports from the same module. |

packages/tsl-module/docs/variables/noDuplicateImport.md

@@ -0,0 +1,32 @@
+[tsl-module](../README.md) / noDuplicateImport
+
+# Variable: noDuplicateImport()
+
+```ts
+const noDuplicateImport: (options?: "off") => Rule<unknown>;
+```
+
+Rule to disallow duplicate imports from the same module.
+
+## Parameters
+
+| Parameter | Type |
+| ------ | ------ |
+| `options?` | `"off"` |
+
+## Returns
+
+`Rule`\<`unknown`\>
+
+## Examples
+
+```ts
+// Incorrect
+import { A } from 'module';
+import { B } from 'module';
+```
+
+```ts
+// Correct
+import { A, B } from 'module';
+```

packages/tsl-module/package.json

@@ -0,0 +1,49 @@
+{
+  "name": "tsl-module",
+  "version": "0.1.3",
+  "description": "A TSL plugin for JavaScript and TypeScript module syntax linting and transformations.",
+  "keywords": [
+    "tsl",
+    "tsl-module"
+  ],
+  "license": "MIT",
+  "author": "Rel1cx<let@ik.me>",
+  "sideEffects": false,
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js"
+    },
+    "./package.json": "./package.json"
+  },
+  "files": [
+    "dist",
+    "./package.json"
+  ],
+  "scripts": {
+    "build": "tsdown --dts-resolve",
+    "build:docs": "typedoc",
+    "lint:publish": "pnpm publint",
+    "lint:ts": "tsl",
+    "publish": "pnpm run build && pnpm run lint:publish"
+  },
+  "dependencies": {
+    "@let/eff": "jsr:^0.1.2"
+  },
+  "devDependencies": {
+    "@local/configs": "workspace:*",
+    "tsdown": "^0.19.0-beta.2"
+  },
+  "peerDependencies": {
+    "tsl": "^1.0.28",
+    "typescript": "^4.9.5 || ^5.4.5"
+  },
+  "engines": {
+    "bun": ">=1.2.18",
+    "node": ">=24.6.0"
+  },
+  "publishConfig": {
+    "access": "public"
+  }
+}

packages/tsl-module/src/index.ts

@@ -0,0 +1 @@
+export { noDuplicateImport } from "./rules/no-duplicate-import";

packages/tsl-module/src/rules/no-duplicate-import.ts

@@ -0,0 +1,55 @@
+import { defineRule } from "tsl";
+import ts from "typescript";
+
+export const messages = {
+  noDuplicateImport: (p: { name: string }) => `Duplicate import of module '${p.name}'.`,
+} as const;
+
+/**
+ * Rule to disallow duplicate imports from the same module.
+ *
+ * @example
+ *
+ * ```ts
+ * // Incorrect
+ * import { A } from 'module';
+ * import { B } from 'module';
+ * ```
+ * @example
+ *
+ * ```ts
+ * // Correct
+ * import { A, B } from 'module';
+ * ```
+ *
+ * ```ts
+ * // Correct
+ * import { A } from 'moduleA';
+ * import type { B } from 'moduleA';
+ * ```
+ */
+export const noDuplicateImport = defineRule(() => {
+  return {
+    name: "module/no-duplicate-import",
+    createData() {
+      return {
+        importedModules: new Set<string>(),
+      };
+    },
+    visitor: {
+      ImportDeclaration(ctx, node) {
+        if (node.importClause?.phaseModifier === ts.SyntaxKind.TypeKeyword) return;
+        const moduleName = node.moduleSpecifier.getText().slice(1, -1);
+        const importedModules = ctx.data.importedModules;
+        if (importedModules.has(moduleName)) {
+          ctx.report({
+            node,
+            message: messages.noDuplicateImport({ name: moduleName }),
+          });
+          return;
+        }
+        importedModules.add(moduleName);
+      },
+    },
+  };
+});