▲ it('success',async() => {awaitWallet.addRecord(WALLET_RECORD)awaitWallet.getRecord({type: WALLET_RECORD.type_,id: WALLET_RECORD.id,options: OPTIONS })awaitWallet.updateRecordValue(UPDATE_WALLET_RECORD)awaitWallet.updateRecordTags(UPDATE_WALLET_TAGS)awaitWallet.addRecordTags(UPDATE_WALLET_TAGS)...
function add(a: number, b: number): number; function add(a: string, b: string): string; function add(a: string, b: number): string; function add(a: number, b: string): string; function add(a: Combinable, b: Combinable) { if (typeof a === "string" || typeof b === "stri...
functionadd(a:number,b:number):number;functionadd(a:string,b:string):string;functionadd(a:string,b:number):string;functionadd(a:number,b:string):string;functionadd(a:Combinable,b:Combinable){// type Combinable = string | number;if(typeofa==='string'||typeofb==='string'){returna.toStri...
* If 'padding' is a number, then that number of spaces is added to the left side. */ function padLeft(value: string, padding: string | number) { // ... } let indentedString = padLeft("Hello world", true); // errors during compilation 联合类型表示一个值可以是几种类型之一。我们...
TypeScript now can correctly infer to indexed access types which immediately index into a mapped object type. Copy interface TypeMap { "number": number; "string": string; "boolean": boolean; } type UnionRecord<P extends keyof TypeMap> = { [K in P]: { kind: K; v: TypeMap[K]; f...
function, inputting no arguments and returning astring. Then,factoryjust gets the right function, based on thed:Discriminator, and returns astringby calling the resulting function. If we now add more elements toDiscriminator, theRecordtype will ensure that TypeScript detects missing cases in...
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单独指定参数、返回值类型。 functionadd(num1:number,num2:number):number{returnnum1+num2}constadd=(num1:number,num2:number):number{returnnum1+num2} 同时指定参数、返回值类型 coantadd(num1:number,num2:number)=>number=(num1,num2)=>{returnnum1+num2} ...
interfaceContext{name:string;metadata:Record<PropertyKey,unknown>; }functionsetMetadata(_target:any,context:Context) { context.metadata[context.name] =true; }classSomeClass{@setMetadatafoo =123;@setMetadataaccessor bar ="hello!";@setMetadatabaz(...
TypeScript Version: 2.1.5 What I'd like to do is effectively extend from a record type and then add a few more custom properties. Since type aliases cannot by extended, I tried solving the problem with an indexed type signature in the in...