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- // Unique symbol cannot be declared in a namespace directly, so we declare it top-level
- // See: https://github.com/sindresorhus/map-obj/pull/38#discussion_r702396878
- declare const skipSymbol: unique symbol;
- declare namespace mapObject {
- type Mapper<
- SourceObjectType extends {[key: string]: any},
- MappedObjectKeyType extends string,
- MappedObjectValueType
- > = (
- sourceKey: keyof SourceObjectType,
- sourceValue: SourceObjectType[keyof SourceObjectType],
- source: SourceObjectType
- ) => [
- targetKey: MappedObjectKeyType,
- targetValue: MappedObjectValueType,
- mapperOptions?: mapObject.MapperOptions
- ] | typeof mapObject.mapObjectSkip;
- interface Options {
- /**
- Recurse nested objects and objects in arrays.
- @default false
- */
- deep?: boolean;
- /**
- Target object to map properties on to.
- @default {}
- */
- target?: {[key: string]: any};
- }
- interface DeepOptions extends Options {
- deep: true;
- }
- interface TargetOptions<TargetObjectType extends {[key: string]: any}> extends Options {
- target: TargetObjectType;
- }
- interface MapperOptions {
- /**
- Whether `targetValue` should be recursed.
- Requires `deep: true`.
- @default true
- */
- readonly shouldRecurse?: boolean;
- }
- /**
- Return this value from a `mapper` function to remove a key from an object.
- @example
- ```
- const mapObject = require('map-obj');
- const object = {one: 1, two: 2}
- const mapper = (key, value) => value === 1 ? [key, value] : mapObject.mapObjectSkip
- const result = mapObject(object, mapper);
- console.log(result);
- //=> {one: 1}
- ```
- */
- const mapObjectSkip: typeof skipSymbol
- }
- /**
- Map object keys and values into a new object.
- @param source - Source object to copy properties from.
- @param mapper - Mapping function.
- @example
- ```
- import mapObject = require('map-obj');
- const newObject = mapObject({foo: 'bar'}, (key, value) => [value, key]);
- //=> {bar: 'foo'}
- const newObject = mapObject({FOO: true, bAr: {bAz: true}}, (key, value) => [key.toLowerCase(), value]);
- //=> {foo: true, bar: {bAz: true}}
- const newObject = mapObject({FOO: true, bAr: {bAz: true}}, (key, value) => [key.toLowerCase(), value], {deep: true});
- //=> {foo: true, bar: {baz: true}}
- const newObject = mapObject({one: 1, two: 2}, (key, value) => value === 1 ? [key, value] : mapObject.mapObjectSkip);
- //=> {one: 1}
- ```
- */
- declare function mapObject<
- SourceObjectType extends object,
- TargetObjectType extends {[key: string]: any},
- MappedObjectKeyType extends string,
- MappedObjectValueType
- >(
- source: SourceObjectType,
- mapper: mapObject.Mapper<
- SourceObjectType,
- MappedObjectKeyType,
- MappedObjectValueType
- >,
- options: mapObject.DeepOptions & mapObject.TargetOptions<TargetObjectType>
- ): TargetObjectType & {[key: string]: unknown};
- declare function mapObject<
- SourceObjectType extends object,
- MappedObjectKeyType extends string,
- MappedObjectValueType
- >(
- source: SourceObjectType,
- mapper: mapObject.Mapper<
- SourceObjectType,
- MappedObjectKeyType,
- MappedObjectValueType
- >,
- options: mapObject.DeepOptions
- ): {[key: string]: unknown};
- declare function mapObject<
- SourceObjectType extends {[key: string]: any},
- TargetObjectType extends {[key: string]: any},
- MappedObjectKeyType extends string,
- MappedObjectValueType
- >(
- source: SourceObjectType,
- mapper: mapObject.Mapper<
- SourceObjectType,
- MappedObjectKeyType,
- MappedObjectValueType
- >,
- options: mapObject.TargetOptions<TargetObjectType>
- ): TargetObjectType & {[K in MappedObjectKeyType]: MappedObjectValueType};
- declare function mapObject<
- SourceObjectType extends {[key: string]: any},
- MappedObjectKeyType extends string,
- MappedObjectValueType
- >(
- source: SourceObjectType,
- mapper: mapObject.Mapper<
- SourceObjectType,
- MappedObjectKeyType,
- MappedObjectValueType
- >,
- options?: mapObject.Options
- ): {[K in MappedObjectKeyType]: MappedObjectValueType};
- export = mapObject;
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