一、.d.ts文件最好在src/typings 目录下，可在tsconfig.json 文件配置

二、vs 监听文件变化，自动编译ts文件

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "baseUrl": "./",
    "outDir": "./bin",
    "paths": {
      "*": [
        "./node_modules/@types",
        "./typings/*"
      ]
    },
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "skipLibCheck": true
  }
}