Add JS toolchain: TypeScript, ESLint, Prettier, Vitest

package.json declares the project as ESM with NodeNext module resolution,
exposing dist/index.js as the library entry and dist/bin/quack.js as the
CLI binary. Dev dependencies are pinned to exact versions (yarn.lock holds
the integrity hashes per repo policy on hash-pinned external references).
Adds a placeholder src/index.ts and a single smoke test so make check is
not a no-op.

eslint.config.mjs

@@ -0,0 +1,10 @@
+import js from "@eslint/js";
+import tseslint from "typescript-eslint";
+
+export default tseslint.config(
+    {
+        ignores: ["dist/", "node_modules/", "coverage/", ".vitest-cache/"],
+    },
+    js.configs.recommended,
+    ...tseslint.configs.recommended,
+);

package.json

@@ -0,0 +1,39 @@
+{
+    "name": "quack",
+    "version": "0.0.0",
+    "description": "TypeScript client library and CLI for the Ente end-to-end encrypted photo service",
+    "license": "WTFPL",
+    "author": "@sneak <https://sneak.berlin>",
+    "homepage": "https://git.eeqj.de/sneak/quack",
+    "repository": {
+        "type": "git",
+        "url": "https://git.eeqj.de/sneak/quack.git"
+    },
+    "type": "module",
+    "main": "./dist/index.js",
+    "types": "./dist/index.d.ts",
+    "bin": {
+        "quack": "./dist/bin/quack.js"
+    },
+    "files": [
+        "dist/",
+        "README.md",
+        "LICENSE"
+    ],
+    "scripts": {
+        "build": "tsc",
+        "test": "vitest run",
+        "lint": "eslint .",
+        "fmt": "prettier --write .",
+        "fmt-check": "prettier --check ."
+    },
+    "devDependencies": {
+        "@eslint/js": "9.38.0",
+        "@types/node": "22.18.13",
+        "eslint": "9.38.0",
+        "prettier": "3.8.1",
+        "typescript": "5.9.3",
+        "typescript-eslint": "8.46.2",
+        "vitest": "2.1.9"
+    }
+}

src/index.ts

@@ -0,0 +1 @@
+export const VERSION = "0.0.0";

test/smoke.test.ts

@@ -0,0 +1,9 @@
+import { describe, expect, it } from "vitest";
+import { VERSION } from "../src/index.js";
+
+describe("quack", () => {
+    it("exports a version string", () => {
+        expect(typeof VERSION).toBe("string");
+        expect(VERSION.length).toBeGreaterThan(0);
+    });
+});

tsconfig.json

@@ -0,0 +1,21 @@
+{
+    "compilerOptions": {
+        "target": "ES2022",
+        "module": "NodeNext",
+        "moduleResolution": "NodeNext",
+        "lib": ["ES2022"],
+        "outDir": "./dist",
+        "rootDir": "./src",
+        "strict": true,
+        "noImplicitOverride": true,
+        "noUncheckedIndexedAccess": true,
+        "esModuleInterop": true,
+        "skipLibCheck": true,
+        "forceConsistentCasingInFileNames": true,
+        "declaration": true,
+        "declarationMap": true,
+        "sourceMap": true,
+        "resolveJsonModule": true
+    },
+    "include": ["src/**/*", "bin/**/*"]
+}