@directus/api/dist/services/graphql/utils/replace-fragments.js

Directus is a real-time API and App dashboard for managing SQL database content

import { flatten } from 'lodash-es';
/**
 * Replace all fragments in a selectionset for the actual selection set as defined in the fragment
 * Effectively merges the selections with the fragments used in those selections
 */
export function replaceFragmentsInSelections(selections, fragments) {
    if (!selections)
        return null;
    const result = flatten(selections.map((selection) => {
        // Fragments can contains fragments themselves. This allows for nested fragments
        if (selection.kind === 'FragmentSpread') {
            return replaceFragmentsInSelections(fragments[selection.name.value].selectionSet.selections, fragments);
        }
        // Nested relational fields can also contain fragments
        if ((selection.kind === 'Field' || selection.kind === 'InlineFragment') && selection.selectionSet) {
            selection.selectionSet.selections = replaceFragmentsInSelections(selection.selectionSet.selections, fragments);
        }
        return selection;
    })).filter((s) => s);
    return result;
}