test.ts — svelte Source File

Source Code

import * as fs from 'node:fs';
import { assert, it } from 'vitest';
import { parse, print } from 'svelte/compiler';
import { try_load_json } from '../helpers.js';
import { suite, type BaseTest } from '../suite.js';
import { walk } from 'zimmerframe';
import type { AST } from 'svelte/compiler';

interface ParserTest extends BaseTest {}

const { test, run } = suite<ParserTest>(async (config, cwd) => {
	const loose = cwd.split('/').pop()!.startsWith('loose-');

	const input = fs
		.readFileSync(`${cwd}/input.svelte`, 'utf-8')
		.replace(/\s+$/, '')
		.replace(/\r/g, '');

	const actual = JSON.parse(
		JSON.stringify(
			parse(input, {
				modern: true,
				loose: cwd.split('/').pop()!.startsWith('loose-')
			})
		)
	);

	delete actual.comments;

	// run `UPDATE_SNAPSHOTS=true pnpm test parser` to update parser tests
	if (process.env.UPDATE_SNAPSHOTS) {
		fs.writeFileSync(`${cwd}/output.json`, JSON.stringify(actual, null, '\t') + '\n');
	} else {
		fs.writeFileSync(`${cwd}/_actual.json`, JSON.stringify(actual, null, '\t'));

		const expected = try_load_json(`${cwd}/output.json`);
		assert.deepEqual(actual, expected);
	}

	if (!loose) {
		const printed = print(actual);
		const reparsed = JSON.parse(
			JSON.stringify(
				parse(printed.code, {
					modern: true,
					loose
				})
			)
		);

		fs.writeFileSync(`${cwd}/_actual.svelte`, printed.code);

		delete reparsed.comments;

		assert.deepEqual(clean(actual), clean(reparsed));
	}
});

function clean(ast: AST.SvelteNode) {
	return walk(ast, null, {
// ... (96 more lines)