@getify/eslint-plugin-proper-arrows/scripts/build-core.js

ESLint rules to ensure proper arrow function definitions

#!/usr/bin/env node

"use strict";

var fs = require("fs"),
	path = require("path"),
	terser = require("terser"),
	year = (new Date()).getFullYear(),

	ROOT_DIR = path.join(__dirname,".."),
	SRC_DIR = path.join(ROOT_DIR,"lib"),
	DIST_DIR = path.join(ROOT_DIR,"dist"),

	LIB_SRC = [
		path.join(SRC_DIR,"index.js"),
	],
	LIB_DIST = [
		path.join(DIST_DIR,"eslint-plugin-proper-arrows.js"),
	]
;


// ***************************

console.log("*** Building ESLint Plugin 'proper-arrows' ***");

(async function main(){
	// try to make the dist directory, if needed
	try {
		fs.mkdirSync(DIST_DIR,0o755);
	}
	catch (err) { }

	// read version number from package.json
	var packageJSON = JSON.parse(
		fs.readFileSync(
			path.join(ROOT_DIR,"package.json"),
			{ encoding: "utf8", }
		)
	);
	var version = packageJSON.version;

	// read copyright-header text, render with version and year
	var copyrightHeader = fs.readFileSync(
		path.join(SRC_DIR,"copyright-header.txt"),
		{ encoding: "utf8", }
	).replace(/`/g,"");
	copyrightHeader = Function("version","year",`return \`${copyrightHeader}\`;`)( version, year );


	// ***************************

	for (let [idx,SRC,] of LIB_SRC.entries()) {
		let DIST = LIB_DIST[idx];

		console.log(`Building: ${DIST}`);

		try {
			let result = "";

			result += fs.readFileSync(SRC,{ encoding: "utf8", });

			result = await terser.minify(result,{
				mangle: {
					keep_fnames: true,
				},
				compress: {
					keep_fnames: true,
				},
				output: {
					comments: /^!/,
				},
			});

			// was compression successful?
			if (!(result && result.code)) {
				if (result.error) throw result.error;
				else throw result;
			}

			// append copyright-header text
			result = `${copyrightHeader}${result.code}`;

			// write dist
			fs.writeFileSync( DIST, result, { encoding: "utf8", } );
		}
		catch (err) {
			console.error(err);
			process.exit(1);
		}
	}

	console.log("Complete.");
})();