@uni-ts/model/dist/derive.js

Utils for creating data models in TypeScript.

const baseProps = new Set(['schema', 'is', 'from', 'cast', 'safeFrom', 'safeCast', 'unsafeFrom', 'unsafeCast']);
/**
 * Derives extensions from a given model.
 *
 * Extensions are properties and methods you define as the second argument in model creation function.
 *
 * @template M - Type of the model
 * @template K - Type of the extension keys to pick from the model
 * @param model - The source model to derive properties from
 * @param keys - Optional array of specific extension keys to pick. If not provided, picks all extensions
 * @returns An object containing only the selected extensions from the model
 *
 * @example
 * ```typescript
 * const Person = createModel(z.object({ name: z.string() }), {
 *   greet: (p: { name: string }) => `Hello, ${p.name}!`,
 * });
 *
 * const Employee = createModel(Person.schema.extend({
 *   id: z.string(),
 * }), {
 *   ...derive(Person),
 *   getBadge: (emp: { id: string }) => `EMP-${emp.id}`,
 * });
 *
 * const emp = Employee.from({ name: 'John', id: '123' });
 * Employee.greet(emp);    // "Hello, John!"
 * Employee.getBadge(emp); // "EMP-123"
 * ```
 */
export function derive(model, keys) {
    const toPick = keys ?? Object.keys(model).filter((key) => !baseProps.has(key));
    return toPick.reduce((acc, key) => {
        acc[key] = model[key];
        return acc;
    }, {});
}
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