create-pro-ts-lib/utils/arguments.js

A command-line-interface for building Typescript libraries

const ErrorWithCode = require('./ErrorWithCode');
const resolveDirectory = argv => {
	const dirs = argv._;
	if (dirs.length > 1) {
		throw new Error(
			`expected 1 directory, received ${dirs.length} - ${dirs}`
		);
	}
	return dirs[0]?.trim?.();
};

class ArgumentExtractor {
	static ERRORS = {
		MISSING_CONFIG: 403,
	};
	static #defaultConfig = {
		options: [],
		flags: [],
		buildOptions: [],
	};

	#config;

	constructor(config = ArgumentExtractor.#defaultConfig) {
		if (!config?.flags) {
			throw new ErrorWithCode(
				`no 'flags' key in config`,
				ArgumentExtractor.ERRORS.MISSING_CONFIG
			);
		}

		if (!config?.options) {
			throw new ErrorWithCode(
				`no 'options' key in config`,
				ArgumentExtractor.ERRORS.MISSING_CONFIG
			);
		}

		this.#config = config;
	}

	getFlags(argv) {
		return this.#config.flags
			.filter(flag => argv[flag.name])
			.reduce(
				(obj, curr) =>
					Object.assign(obj, {
						[curr.name]: {
							flag: curr,
							value: argv[curr.name],
						},
					}),
				{}
			);
	}

	getOptions(argv) {
		return this.#config.options.filter(option => argv[option.name]);
	}

	getBuildOptions(argv) {
		return this.#config.buildOptions.filter(option => argv[option.name]);
	}
}

module.exports = {
	ArgumentExtractor,
	resolveDirectory,
};