@nestjs/graphql/dist/utils/backfill-default-values.util.js

Nest - modern, fast, powerful node.js web framework (@graphql)

import { isInputObjectType, isInterfaceType, isObjectType, } from 'graphql';
/**
 * graphql v17 exposes argument and input field defaults through the new
 * `default` property and deprecates `defaultValue`. Schema elements created by
 * packages that still rely on `defaultValue` (e.g. `@apollo/subgraph`) end up
 * with `default` left undefined, which makes `printSchemaWithDirectives` drop
 * the default from the printed SDL.
 *
 * Backfilling `default` from `defaultValue` keeps those defaults in the SDL. It
 * is a no-op on graphql v16, where `default` does not exist.
 */
export function backfillDefaultValues(schema) {
    for (const directive of schema.getDirectives()) {
        directive.args.forEach(backfillDefaultValue);
    }
    for (const type of Object.values(schema.getTypeMap())) {
        if (isObjectType(type) || isInterfaceType(type)) {
            for (const field of Object.values(type.getFields())) {
                field.args.forEach(backfillDefaultValue);
            }
        }
        else if (isInputObjectType(type)) {
            Object.values(type.getFields()).forEach(backfillDefaultValue);
        }
    }
    return schema;
}
function backfillDefaultValue(element) {
    const holder = element;
    if (!('default' in holder) || holder.default !== undefined) {
        return;
    }
    if (holder.defaultValue !== undefined) {
        holder.default = { value: holder.defaultValue };
    }
}