Diffusion Ant (type-hints-typescript) Code

ant/examples/jsondb/jsondb.js
899dad6b8a9etype-hints-typescript

jsondb.js
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			import fs from 'fs';

			const defaultOptions = {
			asyncWrite: false,
			syncOnWrite: true,
			jsonSpaces: 4,
			stringify: JSON.stringify,
			parse: JSON.parse
			};

			class JSONdb {
			#filePath;
			#options;
			#storage;

			constructor(filePath, options) {
			if (!filePath \|\| !filePath.length) {
			throw new Error('Missing file path argument.');
			}
			this.#filePath = filePath;
			this.#options = { ...defaultOptions, ...options };
			this.#storage = {};

			let stats;
			try {
			stats = fs.statSync(filePath);
			} catch (err) {
			if (err.code === 'ENOENT') return;
			if (err.code === 'EACCES') throw new Error(`Cannot access path "${filePath}".`);
			throw new Error(`Error while checking for existence of path "${filePath}": ${err}`);
			}

			try {
			fs.accessSync(filePath, fs.constants.R_OK \| fs.constants.W_OK);
			} catch (err) {
			throw new Error(`Cannot read & write on path "${filePath}". Check permissions!`);
			}

			if (stats.size > 0) {
			const data = fs.readFileSync(filePath);
			this.#validateJSON(data);
			this.#storage = this.#options.parse(data);
			}
			}

			#validateJSON(fileContent) {
			try {
			this.#options.parse(fileContent);
			} catch (e) {
			console.error('Given filePath is not empty and its content is not valid JSON.');
			throw e;
			}
			return true;
			}

			set(key, value) {
			this.#storage[key] = value;
			if (this.#options.syncOnWrite) this.sync();
			}

			get(key) {
			return Object.hasOwn(this.#storage, key) ? this.#storage[key] : undefined;
			}

			has(key) {
			return Object.hasOwn(this.#storage, key);
			}

			delete(key) {
			const existed = Object.hasOwn(this.#storage, key);
			if (!existed) return undefined;
			delete this.#storage[key];
			if (this.#options.syncOnWrite) this.sync();
			return true;
			}

			deleteAll() {
			for (const key of Object.keys(this.#storage)) {
			this.delete(key);
			}
			return this;
			}

			sync() {
			const data = this.#options.stringify(this.#storage, null, this.#options.jsonSpaces);
			if (this.#options.asyncWrite) {
			fs.writeFile(this.#filePath, data, err => {
			if (err) throw err;
			});
			} else {
			try {
			fs.writeFileSync(this.#filePath, data);
			} catch (err) {
			if (err.code === 'EACCES') throw new Error(`Cannot access path "${this.#filePath}".`);
			throw new Error(`Error while writing to path "${this.#filePath}": ${err}`);
			}
			}
			}

			JSON(storage) {
			if (storage) {
			try {
			JSON.parse(this.#options.stringify(storage));
			this.#storage = storage;
			} catch (err) {
			throw new Error('Given parameter is not a valid JSON object.');
			}
			}
			return JSON.parse(this.#options.stringify(this.#storage));
			}
			}

			export default JSONdb;

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