check-treeshakeability.js — svelte Source File

Source Code

import fs from 'node:fs';
import path from 'node:path';
import process from 'node:process';
import { rollup } from 'rollup';
import virtual from '@rollup/plugin-virtual';
import { nodeResolve } from '@rollup/plugin-node-resolve';
import { compile } from 'svelte/compiler';

/**
 * @param {string} entry
 */
async function bundle_code(entry) {
	const bundle = await rollup({
		input: '__entry__',
		plugins: [
			virtual({
				__entry__: entry
			}),
			{
				name: 'resolve-svelte',
				resolveId(importee) {
					if (importee.startsWith('svelte')) {
						const entry = pkg.exports[importee.replace('svelte', '.')];
						return path.resolve(entry.browser ?? entry.default);
					}
				}
			},
			nodeResolve({
				exportConditions: ['production', 'import', 'browser', 'default']
			})
		],
		onwarn: (warning, handle) => {
			if (warning.code !== 'EMPTY_BUNDLE' && warning.code !== 'CIRCULAR_DEPENDENCY') {
				handle(warning);
			}
		}
	});

	const { output } = await bundle.generate({});

	if (output.length > 1) {
		throw new Error('errr what');
	}

	return output[0].code.trim();
}

const pkg = JSON.parse(fs.readFileSync('package.json', 'utf8'));

let failed = false;

// eslint-disable-next-line no-console
console.group('checking treeshakeability');

for (const key in pkg.exports) {
	// special cases
	if (key === './compiler') continue;
	if (key === './internal') continue;
	if (key === './internal/disclose-version') continue;
	if (key === './internal/flags/legacy') continue;
// ... (104 more lines)