@clipboard-health/json-api-nestjs/src/lib/internal/queryFilterPreprocessor.js

TypeScript-friendly utilities for adhering to the JSON:API specification with NestJS.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.queryFilterPreprocessor = queryFilterPreprocessor;
/**
 * NestJS-specific query processing based on the output of `ctx.switchToHttp().getRequest().query`.
 *
 * We handle the following cases:
 * 1. For `?filter[age]=10,20`, `value` is `10,20`, which we transform to `{eq: "10,20"}`.
 * 2. For `?filter[age]=20`, `value` is `20`, which we transform to `{eq: "20"}`.
 * 3. For `?filter[age][gt]=10&filter[age]=20`, `value` is `{'20': true, gt: '10'}`, which we
 *    transform to `{eq: "20", gt: "10"}`.
 * 4. For `?filter[age]=10&filter[age]=20`, `value` is `['10', '20']`, which we transform to `{eq:
 *    "10,20"}`.
 * 5. For `?filter[age][gt]=5&filter[age]=10&filter[age]=20`, `value` is `{'0': '10', '1': '20', gt:
 *    '5'}`, which we transform to `{eq: "10,20", gt: "5"}`.
 */
function queryFilterPreprocessor(value) {
    if (!isObject(value)) {
        // Cases 1 and 2.
        return { eq: String(value) };
    }
    return Object.entries(value).reduce((filter, [key, value]) => {
        const boolValue = typeof value === "boolean";
        if (/^\d+$/.test(key) || boolValue) {
            // Cases 3 and 5.
            const eq = boolValue ? key : String(value);
            return {
                ...filter,
                eq: filter["eq"] ? `${filter["eq"]},${eq}` : eq,
            };
        }
        // Case 4 and other cases like `gt`, `lt`, etc.
        const stringValue = Array.isArray(value) ? value.join(",") : String(value);
        return {
            ...filter,
            [key]: filter[key] ? `${filter[key]},${stringValue}` : stringValue,
        };
    }, {});
}
function isObject(value) {
    return value !== null && value !== undefined && typeof value === "object";
}
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