gulpfile.cjs

/* eslint-disable spellcheck/spell-checker */
const gulp = require('gulp');
const ts = require('gulp-typescript');
const mergeStream = require('merge-stream');
const sourcemaps = require('gulp-sourcemaps');

const cleanPackageJson = require('gulp-clean-package');

const buildDir = 'dist';

// Helpers
function tsCompilerFactory(outPath, settings) {
	return function compileTS() {
		const tsProject = ts.createProject('tsconfig.json', settings);

		return gulp
			.src(['src/**/!(*.test).{ts,tsx}'])
			.pipe(sourcemaps.init())
			.pipe(tsProject())
			.pipe(sourcemaps.write())
			.pipe(gulp.dest(outPath));
	};
}

// Main
function build() {
	return gulp.parallel([
		// Compile TS files
		Object.assign(tsCompilerFactory(buildDir, { module: 'commonjs' }), {
			displayName: 'TSC:esnext',
		}),

		// Copy js files and declarations
		Object.assign(
			function copyNotTranspilableSources() {
				return gulp.src([`src/**/!(*.test).{js,d.ts}`]).pipe(gulp.dest(buildDir));
			},
			{
				displayName: 'CopyPureSources:esnext',
			},
		),
	]);
}

function copyMetaFiles() {
	return mergeStream(
		// Clean package.json
		gulp.src(['package.json']).pipe(cleanPackageJson()),
		// Copy other
		gulp.src(['README.md', 'LICENSE']),
	).pipe(gulp.dest(buildDir));
}

// Compilations
const fullBuild = gulp.series([copyMetaFiles, build()]);

module.exports.default = fullBuild;