class-validator-extended/dist/map/map-unique-keys/map-unique-keys.predicate.js

Additional validators for class-validator.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.mapUniqueKeys = mapUniqueKeys;
const is_map_1 = require("../../type/is-map");
/**
 * @category Predicates
 * @param value The value to validate.
 * @param projection The function mapping each key to the value that is used for the uniqueness check.
 * @typeParam Key The type of the map's keys.
 * @typeParam Projection The type returned by `projection`.
 */
function mapUniqueKeys(value, projection) {
    if (typeof projection !== 'function') {
        throw new TypeError('Parameter "projection" must be a function');
    }
    if (!(0, is_map_1.isMap)(value)) {
        return false;
    }
    const seen = new Set();
    const map = value;
    for (const item of map.keys()) {
        const selected = projection(item);
        if (seen.has(selected)) {
            return false;
        }
        seen.add(selected);
    }
    return true;
}