为什么不编译?
import * as fs from 'fs';
var folder: string = "c:/test1/test2/test3/";
fs.mkdirSync(folder, { recursive:true }); // the {object} shows an error
我是使用MS Visual Studio 2019社区的TypeScript新手。将工作的Node.JS代码转换为TypeScript。我在项目启动时调用了一个函数。该代码在Node.JS中有效,但在TypeScript中显示编译错误。
fs.mkdirSync(文件夹,{递归:true}); // {object}无法编译。
我看不到为什么我不允许传递指定递归位的对象。目前在新手荒野中徘徊。建议将不胜感激。 当我将鼠标悬停在编译错误上时,会出现以下弹出窗口:
(property) recursive: boolean
(TS) Argument of type '{ recursive: boolean }' is not assignable to parameter of type 'string | number'.
Type '{ recursive: boolean }' is not assignable to type 'number'.
它似乎忽略了MakeDirectoryOptions的fs.d.ts定义:
我到目前为止所做的:
1)我搜索了驱动器C :,并找到了4个fs.d.ts文件。每个都包含以下定义:
function mkdirSync(path: PathLike, options?: number | string | MakeDirectoryOptions | null): void;
export interface MakeDirectoryOptions {
/**
* Indicates whether parent folders should be created.
* @default false
*/
recursive?: boolean;
/**
* A file mode. If a string is passed, it is parsed as an octal integer. If not specified
* @default 0o777.
*/
mode?: number;
}
2)我尝试修改package.json设置:
"devDependencies": {
"@types/node": "^8.0.14",
"typescript": "^3.2.2" // forcing this to use the latest 3.6.0
}
重现该问题的代码: ----- server.ts
import * as fs from 'fs';
//import fs = require("fs"); // does not work
//var fs = require("fs"); // compiles
var folder:string = "c:/test1/test2/test3/";
var result: string = "untested";
try {
// test for the existance of a folder
if (!fs.existsSync(folder)) {
// create the folder if found to not exist
fs.mkdirSync(folder, { recursive: true }); // { recursive: true } shows as compile error
result = "created";
}
else {
result = "exists already";
}
}catch(err) {
result = err.message;
}
import * as http from 'http';
var port: number | string = process.env.port || 1337
http.createServer(function (req, res) {
res.writeHead(200, { 'Content-Type': 'text/plain' });
res.end('Operation result: = ' + result + "\n");
}).listen(port);
----- package.json
{
"name": "trials",
"version": "0.0.0",
"description": "trials",
"main": "server.js",
"author": {
"name": ""
},
"scripts": {
"build": "tsc --build",
"clean": "tsc --build --clean"
},
"devDependencies": {
"@types/node": "^8.0.14",
"typescript": "^3.2.2"
}
}
----- tsconfig.json
{
"compilerOptions": {
"module": "commonjs",
"target": "es6",
"lib": ["es6"],
"sourceMap": true
},
"exclude": [
"node_modules"
]
}
-----代码结尾
如果我将“ import *从'fs'更改为fs;”行到: var fs = require(“ fs”); 一切都可以编译和运行-但我认为这是作弊吗?
它似乎忽略了MakeDirectoryOptions的fs.d.ts定义:
function mkdirSync(path:PathLike,options ?: number | string | MakeDirectoryOptions | null):void;
导出接口MakeDirectoryOptions {etc ....}
答案 0 :(得分:1)
我在这里找到了答案:
https://github.com/DefinitelyTyped/DefinitelyTyped/issues/34980
对于TypeScript新手来说,上面的答案仍然令人困惑,因此我对类型进行了全局卸载并重新安装了最新版本。我以管理员身份打开命令提示符,然后键入以下内容。
npm uninstall -g @types/node
npm install -g @types/node@latest
这似乎已经解决了问题。如果您不建议,请告知。
答案 1 :(得分:0)
对我来说,当我降级@types/node 版本时问题就解决了
"@types/node": "16.0.0"
到
"@types/node": "15.12.5"