npm install -g typescript

tsc --version
Version 4.3.5

mkdir src
cd src
touch app.ts 

cd ../
tsc --init

{
    "compilerOptions": {
        "module": "commonjs",
        "target": "ES5",
        "strict": false,
        "noImplicitAny": true,
        "strictNullChecks": false,
        "sourceMap": false,
        "outDir": "./dist"
    },
    "include": [
        "src/**/*"
    ],
    "compileOnSave": false
}

tsc -t es5 -w  ./src/*.ts

node app.js

{
    "compilerOptions": { //编译配置选项 确定如何编译ts文件
        "module": "commonjs", 
        "target": "es5", 
        "sourceMap": false,
        "noImplicitAny": true, 
        "strictNullChecks": false,
        "outDir": "./dist"
    },
    "include": [
        "src/**/*"
    ]
}

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