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Commitdf7dcbf

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Merge pull request#239 from aelshinawy/main
[Snippets] Added some helper types for Typescript
2 parentscbb3118 +d2c7e92 commitdf7dcbf

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---
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title:At Least One Key
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description:Ensures that at least one property of an object is required.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition
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---
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```ts
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typeAtLeastOne<T>= {
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[KinkeyofT]:Pick<T,K>&Partial<Omit<T,K>>;
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}[keyofT];
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// Usage:
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typeA= {
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id?:string;
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name?:string;
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isActive?:boolean;
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};
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typeAtLeastOneA=AtLeastOne<A>;
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// Requires at least one of 'id', 'name', or 'isActive' to be defined
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```
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---
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title:Deep Partial Type
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description:Converts all properties of a type, including nested objects, into optional.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,optional
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---
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```ts
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typeDeepPartial<T>= {
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[KinkeyofT]?:T[K]extendsobject?DeepPartial<T[K]>:T[K];
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};
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// Usage:
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typeA= {
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name:string;
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details: {
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age:number;
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address: { city:string; zip:string };
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};
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};
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typePartialA=DeepPartial<A>;
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/*
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Type PartialA:
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{
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name?: string;
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details?: {
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age?: number;
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address?: { city?: string; zip?: string };
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};
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}
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*/
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```
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---
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title:Deep Readonly Type
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description:Converts all properties of a type, including nested objects, into readonly.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,readonly
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---
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```ts
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typeDeepReadonly<T>= {
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readonly [KinkeyofT]:T[K]extendsobject?DeepReadonly<T[K]>:T[K];
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};
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// Usage:
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typeA= {
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name:string;
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details: {
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age:number;
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address: { city:string; zip:string };
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};
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};
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typeReadonlyA=DeepReadonly<A>;
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/*
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Type ReadonlyA:
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{
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readonly name: string;
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readonly details: {
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readonly age: number;
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readonly address: { readonly city: string; readonly zip: string };
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};
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}
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*/
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```
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---
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title:Deep Required Type
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description:Converts all properties of a type, including nested objects, into required.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,required
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---
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```ts
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typeDeepRequired<T>=Textendsobject
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? { [KinkeyofT]-?:DeepRequired<T[K]> }
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:T;
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// Usage:
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typeA= {
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id?:string;
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name?:string;
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details?: {
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age?:number;
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address?: { city?:string; zip?:string };
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};
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};
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typeRequiredA=DeepRequired<A>;
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// Result: { id: string; name: string; details: { age: number; address: { city: string; zip: string }; }; }
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```
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---
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title:Keys of Type
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description:Extracts keys from an object type that match a specified value type.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition
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---
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```ts
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typeKeysOfType<T,U>= { [KinkeyofT]:T[K]extendsU?K:never }[keyofT];
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// Usage:
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typeA= { name:string; age:number; isActive:boolean, isDeleted:boolean };
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typeStringKeys=KeysOfType<A,string>;// "name"
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typeBooleanKeys=KeysOfType<A,boolean>;// "isActive" | "isDeleted"
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```
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---
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title:Keys to Optional
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description:Makes only the specified keys of an object type optional.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,optional
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---
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```ts
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typeOptionalKeys<T,KextendskeyofT>=Omit<T,K>&Partial<Pick<T,K>>;
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// Usage:
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typeA= {
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id:string;
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name:string;
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age:number;
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};
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typeWithOptionalName=OptionalKeys<A,"name">;
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// { id: string; age: number; name?: string }
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typeWithOptionalNameAndAge=OptionalKeys<A,"name"|"age">;
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// Result: { id: string; name?: string; age?: number }
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```
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---
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title:Nullable Keys
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description:Extracts keys from an object type that allow null or undefined values.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,nullable
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---
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```ts
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typeNullableKeys<T>= {
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[KinkeyofT]:nullextendsT[K]?K:undefinedextendsT[K]?K:never;
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}[keyofT];
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// Usage:
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typeA= {
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id:string;
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name?:string;
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description:string|null;
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};
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typeNullable=NullableKeys<A>;// "name" | "description"
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```
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---
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title:Omit Keys of Type
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description:Removes keys of a specified type from an object type.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,omit,keys
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---
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```ts
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typeOmitKeysOfType<T,U>= {
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[KinkeyofTasT[K]extendsU?never:K]:T[K];
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};
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// Usage:
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typeA= {
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id:string;
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isActive:boolean;
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data:number[];
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};
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typeWithoutBoolean=OmitKeysOfType<A,boolean>;// { id: string; data: number[] }
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```
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---
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title:Required Keys
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description:Extracts required keys from an object.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,required
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---
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```ts
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typeRequiredKeys<T>= {
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[KinkeyofT]-?: {}extendsPick<T,K>?never:K;
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}[keyofT];
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// Usage:
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typeA= {
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id:string;
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name?:string;
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isActive:boolean;
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};
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typeReqKeys=RequiredKeys<A>;// "id" | "isActive"
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```
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---
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title:Union to Intersection
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description:Converts a union type into an intersection type.
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author:aelshinawy
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tags:typescript,helper-types,typedefinition,intersection,union
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---
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```ts
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typeUnionToIntersection<U>= (Uextendsany? (arg:U)=>void:never)extends (arg:inferI)=>void
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?I
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:never;
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// Usage:
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typeA= { id:string };
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typeB= { name:string };
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typeC= { age:number };
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typeIntersected=UnionToIntersection<A|B|C>;
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// { id: string } & { name: string } & { age: number }
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```

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