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53 lines
2.1 KiB
53 lines
2.1 KiB
/**
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* Primitive
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* @desc Type representing [`Primitive`](https://developer.mozilla.org/en-US/docs/Glossary/Primitive) types in TypeScript: `string | number | bigint | boolean | symbol | null | undefined`
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* @example
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* type Various = number | string | object;
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*
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* // Expect: object
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* type Cleaned = Exclude<Various, Primitive>
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*/
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export declare type Primitive = string | number | bigint | boolean | symbol | null | undefined;
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/**
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* Falsy
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* @desc Type representing falsy values in TypeScript: `false | "" | 0 | null | undefined`
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* @example
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* type Various = 'a' | 'b' | undefined | false;
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*
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* // Expect: "a" | "b"
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* Exclude<Various, Falsy>;
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*/
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export declare type Falsy = false | '' | 0 | null | undefined;
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/**
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* Tests for one of the [`Primitive`](https://developer.mozilla.org/en-US/docs/Glossary/Primitive) types using the JavaScript [`typeof`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof) operator
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*
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* Clarification: TypeScript overloads this operator to produce TypeScript types if used in context of types.
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*
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* @param val The value to be tested
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* @returns If `val` is primitive. If used in the flow of the program typescript will infer type-information from this.
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*
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* @example
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* const consumer = (value: Primitive | Primitive[]) => {
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* if (isPrimitive(value)) {
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* return console.log('Primitive value: ', value);
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* }
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* // type of value now inferred as Primitive[]
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* value.map((primitive) => consumer(primitive));
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* };
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*/
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export declare const isPrimitive: (val: unknown) => val is Primitive;
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/**
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* Tests for Falsy by simply applying negation `!` to the tested `val`.
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*
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* The value is mostly in added type-information and explicity,
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* but in case of this simple type much the same can often be archived by just using negation `!`:
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* @example
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* const consumer = (value: boolean | Falsy) => {
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* if (!value) {
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* return ;
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* }
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* type newType = typeof value; // === true
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* // do stuff
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* };
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*/
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export declare const isFalsy: (val: unknown) => val is Falsy;
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