initial

.editorconfig

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+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+[*.{js,json,yml}]
+charset = utf-8
+indent_style = space
+indent_size = 2

.gitattributes

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+/.yarn/**            linguist-vendored
+/.yarn/releases/*    binary
+/.yarn/plugins/**/*  binary
+/.pnp.*              binary linguist-generated

.gitignore

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+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
+
+# Swap the comments on the following lines if you wish to use zero-installs
+# In that case, don't forget to run `yarn config set enableGlobalCache false`!
+# Documentation here: https://yarnpkg.com/features/caching#zero-installs
+
+#!.yarn/cache
+.pnp.*

README.md

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+# packages
+git+https

libs/index.ts

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+export function helloWorld() {
+  console.log("Hello World!");
+}
+/**
+ * 将数字格式化为美式金额表示法
+ * 将金额格式化为两位小数,需要处理千分位格式
+ * @param amount - 需要格式化的数字金额
+ * @returns 返回格式化后的金额字符串，保留2位小数
+ * @example
+ * formatMoney(1234.5) // 返回 "1,234.50"
+ * formatMoney(1000000) // 返回 "1,000,000.00"
+ */
+export function formatMoney(amount: number) {
+    return new Intl.NumberFormat('en-US', { style: 'decimal', minimumFractionDigits: 2, maximumFractionDigits: 2 }).format(amount);
+}

package.json

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+{
+  "name": "packages",
+  "version": "0.0.1",
+  "type": "module",
+  "license": "MIT",
+  "author": "callmeyan <me@xiaoyan.me>",
+  "main": "dist/index.cjs",
+  "types": "dist/index.d.cts",
+  "repository": {
+    "type": "git",
+    "url": "git://git.wm-app.xyz/packages/npm-package-demo.git"
+  },
+  "keywords": [
+    "packages",
+    "package",
+    "manager",
+    "demo",
+    "yarn"
+  ],
+  "scripts": {
+    "build": "tsup libs/index.ts --dts --clean",
+    "clean": "git clean -xdf dist",
+    "test": "bun test"
+  },
+  "packageManager": "yarn@4.5.2",
+  "devDependencies": {
+    "tsup": "^8.4.0",
+    "typescript": "^5.8.3"
+  }
+}

tests/index.test.ts

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+// index.test.ts
+import { formatMoney } from '../libs/index';
+
+describe('FormatMoneyTest', () => {
+    test('should format positive integer correctly', () => {
+        // Arrange
+        const input = 1234;
+        const expectedOutput = "1,234.00";
+
+        // Act
+        const result = formatMoney(input);
+
+        // Assert
+        expect(result).toBe(expectedOutput);
+    });
+
+    test('should format zero correctly', () => {
+        // Arrange
+        const input = 0;
+        const expectedOutput = "0.00";
+
+        // Act
+        const result = formatMoney(input);
+
+        // Assert
+        expect(result).toBe(expectedOutput);
+    });
+
+    test('should format large integer correctly', () => {
+        // Arrange
+        const input = 1000000;
+        const expectedOutput = "1,000,000.00";
+
+        // Act
+        const result = formatMoney(input);
+
+        // Assert
+        expect(result).toBe(expectedOutput);
+    });
+
+    test('should format negative integer correctly', () => {
+        // Arrange
+        const input = -5000;
+        const expectedOutput = "-5,000.00";
+
+        // Act
+        const result = formatMoney(input);
+
+        // Assert
+        expect(result).toBe(expectedOutput);
+    });
+});