@graphql-tools/stitch/esm/mergeDirectives.js

A set of utils for faster development of GraphQL tools

import { GraphQLDirective } from 'graphql';
import { mergeDeep } from '@graphql-tools/utils';
export function mergeDirectives(directives) {
    if (directives.size === 0) {
        return undefined;
    }
    if (directives.size === 1) {
        const directive = directives.values().next().value;
        return directive;
    }
    let name;
    let description;
    const locations = new Set();
    const args = {};
    const extensionsSet = new Set();
    let isRepeatable = false;
    for (const directive of directives) {
        name = directive.name;
        if (directive.description) {
            description = directive.description;
        }
        for (const location of directive.locations) {
            locations.add(location);
        }
        for (const arg of directive.args) {
            args[arg.name] = arg;
        }
        isRepeatable = isRepeatable || directive.isRepeatable;
        if (directive.extensions) {
            extensionsSet.add(directive.extensions);
        }
    }
    return new GraphQLDirective({
        name: name,
        description: description,
        locations: Array.from(locations),
        args,
        isRepeatable,
        extensions: extensionsSet.size > 0 ? mergeDeep([...extensionsSet]) : undefined,
    });
}