Type Alias ValueGetter<DataType>

ValueGetter: string | (data: DataType) => any

A value extractor that can retrieve data from an object using various methods.

This type supports multiple ways to extract values from your data structure:

DataType extends Record<string, unknown>
The type of the data object to extract values from

Simple property access:

const getter: ValueGetter<{ name: string }> = "name";

Dot notation for nested properties:

const getter: ValueGetter<{ user: { profile: { name: string } } }> = "user.profile.name";

Array element access:

const getter: ValueGetter<{ items: string[] }> = "items[0]";

JSONPath expression:

const getter: ValueGetter<{ items: Array<{ id: number }> }> = "$.items[*].id";

Function-based extraction:

const getter: ValueGetter<{ firstName: string; lastName: string }> =
  (data) => `${data.firstName} ${data.lastName}`;

Complex transformation:

const getter: ValueGetter<{ scores: number[] }> =
  (data) => data.scores.reduce((a, b) => a + b, 0) / data.scores.length;