json-file-database/dist/src/database.js

Lightweight Database on NodeJS by JSON Files

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.connect = void 0;
const collection_1 = require("./collection");
const database_file_1 = require("./database-file");
function getDataSaver(data, delay, file, beautify, onSaved) {
    let timeout;
    return (name, elements) => {
        clearTimeout(timeout);
        timeout = setTimeout(() => {
            data[name] = elements;
            file.write(JSON.stringify(data, null, beautify ? 2 : 0));
            onSaved.apply(undefined);
        }, delay);
    };
}
function withDefaults(data, defaults) {
    return Object.keys(defaults).reduce((data, key) => {
        var _a;
        const data1 = data;
        const defaults1 = defaults;
        (_a = data1[key]) !== null && _a !== void 0 ? _a : (data1[key] = defaults1[key]);
        return data;
    }, data);
}
function createDatabase(data, save) {
    return (options) => {
        // Make options with default values.
        const { name, comparator, primaryKey } = withDefaults(options, {
            comparator: (first, second) => {
                first = Reflect.get(first, primaryKey);
                second = Reflect.get(second, primaryKey);
                if (first > second)
                    return 1;
                else if (first < second)
                    return -1;
                return 0;
            },
        });
        // Make sure the property is an array.
        const elements = data[name] || (data[name] = []);
        if (!Array.isArray(elements))
            throw new TypeError(`Property ${name} in the database is not an array.`);
        // Make collection options.
        return new collection_1.Collection({ name, comparator, primaryKey, elements, save });
    };
}
/**
 * Connects the database synchronously.
 * @param options the options for connection.
 * @returns the database.
 */
function connect(options) {
    // Make the options with default values.
    const op = withDefaults(options, {
        beautify: false,
        delay: 0,
        init: {},
        onSaved: () => { },
    });
    const { beautify, delay, init, onSaved } = op;
    let { file } = op;
    if (typeof file === 'string')
        file = (0, database_file_1.createFile)(file);
    // Read the file, or set the data as init.
    let data;
    try {
        data = JSON.parse(file.read());
    }
    catch (_a) {
        data = init;
    }
    const save = getDataSaver(data, delay, file, beautify, onSaved);
    return createDatabase(data, save);
}
exports.connect = connect;