@graphql-mesh/transport-rest/esm/directives/discriminator.js

export function processDiscriminatorAnnotations({ interfaceType, discriminatorField, discriminatorMapping, }) {
    const discriminatorMappingObj = Array.isArray(discriminatorMapping)
        ? Object.fromEntries(discriminatorMapping)
        : discriminatorMapping;
    interfaceType.resolveType = function discriminatorDirectiveHandler(data) {
        const discriminatorValue = data[discriminatorField];
        return discriminatorMappingObj?.[discriminatorValue] || discriminatorValue;
    };
}