source: imaps-frontend/node_modules/safe-array-concat/index.js

'use strict';

var GetIntrinsic = require('get-intrinsic');
var $concat = GetIntrinsic('%Array.prototype.concat%');

var callBind = require('call-bind');

var callBound = require('call-bind/callBound');
var $slice = callBound('Array.prototype.slice');

var hasSymbols = require('has-symbols/shams')();
var isConcatSpreadable = hasSymbols && Symbol.isConcatSpreadable;

/** @type {never[]} */ var empty = [];
var $concatApply = isConcatSpreadable ? callBind.apply($concat, empty) : null;

// eslint-disable-next-line no-extra-parens
var isArray = isConcatSpreadable ? /** @type {(value: unknown) => value is unknown[]} */ (require('isarray')) : null;

/** @type {import('.')} */
module.exports = isConcatSpreadable
        // eslint-disable-next-line no-unused-vars
        ? function safeArrayConcat(item) {
                for (var i = 0; i < arguments.length; i += 1) {
                        /** @type {typeof item} */ var arg = arguments[i];
                        // @ts-expect-error ts(2538) see https://github.com/microsoft/TypeScript/issues/9998#issuecomment-1890787975; works if `const`
                        if (arg && typeof arg === 'object' && typeof arg[isConcatSpreadable] === 'boolean') {
                                // @ts-expect-error ts(7015) TS doesn't yet support Symbol indexing
                                if (!empty[isConcatSpreadable]) {
                                        // @ts-expect-error ts(7015) TS doesn't yet support Symbol indexing
                                        empty[isConcatSpreadable] = true;
                                }
                                // @ts-expect-error ts(2721) ts(18047) not sure why TS can't figure out this can't be null
                                var arr = isArray(arg) ? $slice(arg) : [arg];
                                // @ts-expect-error ts(7015) TS can't handle expandos on an array
                                arr[isConcatSpreadable] = true; // shadow the property. TODO: use [[Define]]
                                arguments[i] = arr;
                        }
                }
                // @ts-expect-error ts(2345) https://github.com/microsoft/TypeScript/issues/57164 TS doesn't understand that apply can take an arguments object
                return $concatApply(arguments);
        }
        : callBind($concat, empty);