@sonibble-creators/nest-microservice-pack/dist/pagination/pagination.js

Microservice pack dependencies for NestJS

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getPagingParameters = void 0;
const graphql_relay_1 = require("graphql-relay");
const getId = (cursor) => parseInt((0, graphql_relay_1.fromGlobalId)(cursor).id, 10);
const nextId = (cursor) => getId(cursor) + 1;
function getPagingParameters(args) {
    const meta = checkPagingSanity(args);
    switch (meta.pagingType) {
        case 'forward': {
            return {
                limit: meta.first,
                offset: meta.after ? nextId(meta.after) : 0,
            };
        }
        case 'backward': {
            const { last, before } = meta;
            let limit = last;
            let offset = getId(before) - last;
            if (offset < 0) {
                limit = Math.max(last + offset, 0);
                offset = 0;
            }
            return { offset, limit };
        }
        default:
            return {
                limit: 8,
                offset: 0,
            };
    }
}
exports.getPagingParameters = getPagingParameters;
function checkPagingSanity(args) {
    const { first = 0, last = 0, after, before } = args;
    const isForwardPaging = !!first || !!after;
    const isBackwardPaging = !!last || !!before;
    if (isForwardPaging && isBackwardPaging) {
        throw new Error('Relay pagination cannot be forwards AND backwards!');
    }
    if ((isForwardPaging && before) || (isBackwardPaging && after)) {
        throw new Error('Paging must use either first/after or last/before!');
    }
    if ((isForwardPaging && first < 0) || (isBackwardPaging && last < 0)) {
        throw new Error('Paging limit must be positive!');
    }
    if (last && !before) {
        throw new Error("When paging backwards, a 'before' argument is required!");
    }
    return isForwardPaging
        ? { pagingType: 'forward', after, first }
        : isBackwardPaging
            ? { pagingType: 'backward', before, last }
            : { pagingType: 'none' };
}
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