Check if file existsFile foundFile not foundImport and use the fileShow error "File does not exist"ImportCheckFileFileExistsFileNotFoundUseFileError 在上面的流程图中,首先我们尝试导入一个模块,然后检查相关文件是否存在。根据文件的存在与否,程序会进行
在项目目录下创建一个 TypeScript 文件,例如checkFile.ts,接着编写以下代码: import*asfsfrom'fs';// 导入 fs 模块// 定义一个函数用来判断文件是否存在functioncheckFileExists(filePath:string):void{// 使用 fs.existsSync 方法判断文件是否存在constexists=fs.existsSync(filePath);if(exists){console.log(`文...
if (this.config.enableMqtt) {this.connectMqtt(); } // 加载缓存数据到内存中 this.LoadStations(); // 定时站点是否在线 // this.CheckStationOnline(); // 定时存储站点数据缓存this.taskStoreStationData(); // 定时重载站点信息 this.timerLoadStationInfo(); // 初始化http请求 thisinitApp...
function foo(arg: unknown) { if (typeof arg === "string") { // We know 'arg' is a string now. console.log(arg.toUpperCase()); } } In this example, we checked whether arg was a string. TypeScript recognized the typeof arg === "string" check, which it considered a type guard...
interfaceCanCheck{checkThing:(x:string|number)=>boolean;}constobj={checkThing:(s:string)=>{returntrue;}}objsatisfiesCanCheck;// Alleged: should be OK This is wrong. Ifobjis aCanCheck, thenobj.checkThing(42)is legal, and42would appear ins, which is only allowed to be astring. ...
if(curTick > START_TICK && curTick %20===0) {// no terracotta exists, and we're waiting to spawn a new one.if(spawnCountdown >0) { spawnCountdown--;if(spawnCountdown <=0) { spawnNewTerracotta(); } }else{ checkForTerracotta(); } } ...
Create amd5 hashof the file contents using therev-hashpackage. Checking the cache output with the same name as the hash. If the file exists, pass its output to Node.jsmodule._compilemethod. Otherwise, compile the file using the Typescript compiler API and cache it on the disk ...
and if it does, TypeScript will try to load a configuration file from that field. If neither exists, TypeScript will try to read from atsconfig.jsonat the root. This is similar to the lookup process for.jsfiles in packages that Node uses, and the.d.tslookup process that TypeScript alr...
DROP TABLE IF EXISTS `powercuthistory`; CREATE TABLE `powercuthistory` ( `SStation` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NOT NULL, `DeviceId` varchar(100) CHARACTER SET utf8mb4 COLLATE utf8mb4_bin NULL DEFAULT NULL, ...
noImplicitAny: Raise error on expressions and declarations with an impliedanytype. This will throw an error if an argument,const,let, orvardoesn’t have a type. This is more of a mental check on yourself to create custom data types for your code. ...