typescript: cannot find name 'unknown'. 原因: typescript版本引起 第三方依赖引起 解决方法: 根据package.json中版本,升级typescript版本 指定安装依赖版本,比如:直接指定 "ng2-pdf-viewer": "5.2.4", 升级@types文件或者指定安装对应ts版本的types,比如安装ts6的lodash types npm i -D @types/lodash@...
在angular项目中引入qs处理url的query部分参数。因qs库是纯js,引入类型定义库@types/qs显示代码提示: {代码...} 安装后项目使用库: {代码...} 此时编译代...
very dangerous}functionformat2(value:unknown){value.toFixed(2);// 代码会飘红,阻止你这么做// 你需要收窄类型范围,例如:// 1、类型断言 —— 不飘红,但执行时可能错误(valueasNumber).toFixed(2);// 2、类型守卫 —— 不飘红,且确保正常执行if(typeofvalue==='number'){// 推断出类型: numbervalue...
1147 错误 Import declarations in a namespace cannot reference a module. 命名空间中的导入声明不能引用模块。1148 错误 Cannot use imports, exports, or module augmentations when '--module' is 'none'. Cannot compile modules unless the '--module' flag is provided with a valid module type. Conside...
1、前言 TypeScript 在版本 2.0 和 3.0 分别引入了 “never” 和“unknown” 两个基本类型,在引入这两个类型之后,TypeScript 的类...
}returnnames.map(name => {url.searchParams.set("name", name)// ~~~// error!// Property 'searchParams' does not exist on type 'string | URL'.returnurl.toString(); }); } Here, TypeScript decided that it wasn’t "safe" to assume thaturlwasactuallyaURLobject in our callback functi...
function f1(obj: Record<string, unknown>, key: string) { if (typeof obj[key] === "string") { // Now okay, previously was error obj[key].toUpperCase(); } } In the above, neither obj nor key are ever mutated, so TypeScript can narrow the type of obj[key] to string after th...
我已经安装了docker工具箱,因为在windows10Home上你不能安装docker。然后在命令提示符中输入dockerpull scrapinghub/splash 我得到了错误error during connect: Post http://%2F%2F.%2Fpipe%2Fdocker_engine/pipe/docker_engine: The system cannot find the file specified ...
A common confusion is to say that sincestring | numberis a bigger type thanstring, this program should be rejected, since it means a number might appear where a string is expected. This reasoning is incorrect; even though a number can be passed toobj.checkThing, that cannot create the sit...
node script.ts node:internal/errors:477 ErrorCaptureStackTrace(err); ^ TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /private/tmp/test/script.ts at new NodeError (node:internal/errors:388:5) at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/es...