无法在VSCode中打开文件，也是简单的编译错误

Question

我刚刚安装了VSCODE，创建了一个简单的HelloWorld.ts文件，当我尝试编译它时说它无法找到该文件？

编译错误是：

预期 HelloWorld（3,9）

不确定这里发生了什么？

tsconfig.json：

{
    "compilerOptions": {
        "target": "es5",
        "module": "amd",
        "sourceMap": true
    }  
} 

tasks.json：

{
    "version": "0.1.0",

    // The command is tsc. Assumes that tsc has been installed using npm install -g typescript
    "command": "tsc",

    // The command is a shell script
    "isShellCommand": true,

    // Show the output window only if unrecognized errors occur.
    "showOutput": "silent",

    // args is the HelloWorld program to compile.
    "args": ["HelloWorld.ts"],

    // use the standard tsc problem matcher to find compile problems
    // in the output.
    "problemMatcher": "$tsc"
}