PR #1: monorepo scaffold

.envrc

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+use flake

.github/workflows/ci.yml

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+name: ci
+
+on:
+  push:
+    branches: [v2, main]
+  pull_request:
+    branches: [v2, main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: oven-sh/setup-bun@v2
+      - run: bun install --frozen-lockfile
+      - run: bun run check
+      - run: bun run typecheck
+      - run: bun run test

.gitignore

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+node_modules/
+.direnv/
+dist/
+*.log
+.DS_Store
+packages/*/dist/

README.md

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+# bitcoinmints
+
+nostr Cashu mint directory. v2 rebuild (read-only, strict NIP-87).
+
+## dev
+
+```
+direnv allow
+bun install
+bun test
+bun run typecheck
+```
+
+## workspaces
+
+- `packages/core` — `@bitcoinmints/core` — pure TS, no DOM (nostr, nip87, cashu, cache, ranking, scheduler)
+- `packages/app` — `@bitcoinmints/app` — Vite + React (coming in later PRs)

biome.json

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+{
+  "$schema": "https://biomejs.dev/schemas/2.3.12/schema.json",
+  "files": {
+    "includes": ["**", "!**/node_modules", "!**/packages/*/dist"]
+  },
+  "formatter": {
+    "enabled": true,
+    "indentStyle": "space",
+    "indentWidth": 2,
+    "lineWidth": 100
+  },
+  "linter": {
+    "enabled": true,
+    "rules": {
+      "recommended": true
+    }
+  },
+  "javascript": {
+    "formatter": {
+      "quoteStyle": "double"
+    }
+  }
+}

flake.nix

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+{
+  description = "bitcoinmints v2 — nostr Cashu mint directory";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          # pkgs.biome is built from source by nixpkgs, so it works natively
+          # on NixOS. Scripts that invoke `biome` (not `bunx biome`) will pick
+          # this up. The @biomejs/biome npm package is also installed via bun
+          # so CI can run `bunx biome` on Ubuntu.
+          packages = [
+            pkgs.bun
+            pkgs.nodejs_20
+            pkgs.biome
+            pkgs.lefthook
+          ];
+        };
+      });
+}

lefthook.yml

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+pre-commit:
+  commands:
+    biome:
+      glob: "*.{ts,tsx,js,jsx,json}"
+      run: biome check --write --no-errors-on-unmatched {staged_files} && git add {staged_files}
+pre-push:
+  commands:
+    typecheck:
+      run: bun run typecheck
+    test:
+      run: bun run test

package.json

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+{
+  "name": "bitcoinmints",
+  "private": true,
+  "type": "module",
+  "workspaces": [
+    "packages/*"
+  ],
+  "scripts": {
+    "check": "biome check .",
+    "format": "biome format --write .",
+    "typecheck": "bun --filter='*' run typecheck",
+    "test": "bun --filter='*' run test"
+  },
+  "devDependencies": {
+    "@biomejs/biome": "2.3.12",
+    "@types/node": "^25.6.0",
+    "typescript": "^6.0.3",
+    "vitest": "^4.1.4"
+  }
+}

packages/app/package.json

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+{
+  "name": "@bitcoinmints/app",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "test": "vitest run --passWithNoTests",
+    "typecheck": "tsc --noEmit"
+  }
+}

packages/app/src/index.ts

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+export {};

packages/app/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "include": ["src/**/*"]
+}

packages/app/vitest.config.ts

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+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: false,
+  },
+});

packages/core/package.json

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+{
+  "name": "@bitcoinmints/core",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "scripts": {
+    "test": "vitest run",
+    "typecheck": "tsc --noEmit"
+  }
+}

packages/core/src/index.test.ts

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+import { expect, test } from "vitest";
+import { VERSION } from "./index";
+
+test("version is set", () => {
+  expect(VERSION).toBe("0.0.0");
+});

packages/core/src/index.ts

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+export const VERSION = "0.0.0";

packages/core/tsconfig.json

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+{
+  "extends": "../../tsconfig.base.json",
+  "include": ["src/**/*"]
+}

packages/core/vitest.config.ts

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+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: false,
+  },
+});

tsconfig.base.json

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+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "strict": true,
+    "noUncheckedIndexedAccess": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "isolatedModules": true
+  }
+}