test.js

'use strict';

const Metalsmith = require('metalsmith');
const buble = require('.');
const test = require('tape');

test('metalsmith-buble', t => {
	t.plan(11);

	new Metalsmith('.')
	.use(buble())
	.run({
		'source.js': {contents: Buffer.from('() => 1')},
		'non-js.txt': {contents: Buffer.from('Hi')}
	}, (err, files) => {
		t.strictEqual(err, null, 'should be used as a metalsmith plugin.');
		t.strictEqual(
			String(files['source.js'].contents),
			'!function() { return 1; }',
			'should transform JavaScript files.'
		);
		t.strictEqual(
			String(files['non-js.txt'].contents),
			'Hi',
			'should not transform non-JavaScript files.'
		);
	});

	new Metalsmith('.')
	.use(buble({sourceMap: true}))
	.run({
		'dir/source.jsx': {contents: Buffer.from('<div />')}
	}, (err, files) => {
		t.strictEqual(err, null, 'should support JSX.');
		t.strictEqual(
			String(files['dir/source.js'].contents),
			'React.createElement( \'div\', null )\n//# sourceMappingURL=source.js.map\n',
			'should append a URL to the bottom of code when `sourceMap` option is true.'
		);
		t.strictEqual(
			String(files['dir/source.js.map'].contents),
			JSON.stringify({
				version: 3,
				file: 'source.js',
				sources: ['../../src/dir/source.jsx'],
				sourcesContent: ['<div />'],
				names: [],
				mappings: 'AAAA,sBAAC,UAAG'
			}),
			'should create a source map file.'
		);
		t.notOk(Object.keys(files).includes('dir/source.jsx'), 'should rename .jsx file to .js.');
	});

	new Metalsmith('.')
	.use(buble({
		target: {firefox: 43},
		transforms: {arrow: true},
		sourceMap: 'inline'
	}))
	.run({'☺️.js': {contents: Buffer.from('let x = y => `z`')}}, (err, files) => {
		t.strictEqual(err, null, 'should support non-ASCII filename.');
		t.strictEqual(
			String(files['☺️.js'].contents),
			`var x = function (y) { return \`z\`; }
//# sourceMappingURL=data:application/json;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjoi4pi677iPLmpzIiwic291cmNlcyI6WyIuLi9zcmMv4pi677iPLmpzIl0sInNvdXJjZXNDb250ZW50IjpbImxldCB4ID0geSA9PiBgemAiXSwibmFtZXMiOlsibGV0Il0sIm1hcHBpbmdzIjoiQUFBQUEsR0FBRyxDQUFDLENBQUMsYUFBRyxFQUFDLENBQUMsU0FBRyxDQUFDLENBQUMifQ==`,
			'should support `target` and `transforms` options.'
		);
	});

	new Metalsmith('.')
	.use(buble({sourceMap: false}))
	.run({'FOO.JS': {contents: Buffer.from('1=a')}}, err => {
		t.ok(err instanceof SyntaxError, 'should fail when Buble cannot transpile the code.');
	});

	t.throws(
		() => buble({sourceMap: [1, 2, 3]}),
		/^TypeError.* `sourceMap` option must be true, false or 'inline', but got \[ 1, 2, 3 ]\./,
		'should throw a type error when it takes an invalid `sourceMap` option value.'
	);
});