Question

node -v =＆gt; v8.9.4
npm -v =＆gt; 5.6.0

想要安装this示例例子中有一个错误或我做错了什么？我相信安装示例所有你需要做的就是克隆并运行npm install但是在执行之后：

mkdir test
cd test
git clone https://github.com/palmerhq/backpack.git
cd ./backpack/examples/with-typescript/
npm install
npm run dev

我收到了：

| backpack-examples-with-typescript@0.5.0 dev ~/test/backpack/examples/with-typescript  
| backpack dev  


[at-loader] Using typescript@2.7.1 from typescript and "tsconfig.json" from ~/test/backpack/examples/with-typescript/tsconfig.json.  


[at-loader] Checking started in a separate process...  

[at-loader] Checking finished with 1 errors  


ERROR  Failed to compile with 1 errors 19:38:08  

error

加号

[at-loader] ./src/main.ts:33:35  
TS2322: Type 'string | 3000' is not assignable to type 'number'.  
Type 'string' is not assignable to type 'number'.  

module.js:540  
throw err;  
^  

Error: Cannot find module '~/test/backpack/examples/with-typescript/build/main.js'  
at Function.Module._resolveFilename (module.js:538:15)  
at Function.Module._load (module.js:468:25)  
at Function.Module.runMain (module.js:684:10)  
at startup (bootstrap_node.js:187:16)  
at bootstrap_node.js:608:3

我在几天前的问题上写了this question，但没有人回答

Answer 1

源代码的this line (33:35)出错了。 NodeJS类型声明中process.env.PORT是typed as string。 getPort但必须返回一个数字。尝试使用以下内容更改该行：

private getPort = (): number => parseInt(process.env.PORT) || 3000;

由于at-loader无法编译，因此无法找到无法找到js文件的附加错误，因此它没有输出该文件。

背包示例＆＃34; with-typescript＆＃34;不编译

1 个答案: