@maplibre/maplibre-gl-style-spec/src/deref.test.ts

a specification for maplibre styles

import {derefLayers, type LayerWithRef} from './deref';
import {describe, test, expect} from 'vitest';

describe('deref', () => {
    test('derefs a ref layer which follows its parent', () => {
        expect(
            derefLayers([
                {
                    id: 'parent',
                    type: 'line'
                } as LayerWithRef,
                {
                    id: 'child',
                    ref: 'parent'
                } as LayerWithRef
            ])
        ).toEqual([
            {
                id: 'parent',
                type: 'line'
            },
            {
                id: 'child',
                type: 'line'
            }
        ]);
    });

    test('derefs a ref layer which precedes its parent', () => {
        expect(
            derefLayers([
                {
                    id: 'child',
                    ref: 'parent'
                } as LayerWithRef,
                {
                    id: 'parent',
                    type: 'line'
                } as LayerWithRef
            ])
        ).toEqual([
            {
                id: 'child',
                type: 'line'
            },
            {
                id: 'parent',
                type: 'line'
            }
        ]);
    });
});