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plugin.js
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import {promises as fs} from 'fs';
/**
* @param {string} txt
* @returns {string}
*/
function gray(txt) {
return '\x1b[30m' + txt + '\x1b[0m';
}
/**
* @param {string} txt
* @returns {string}
*/
function blue(txt) {
return '\x1b[36m' + txt + '\x1b[0m';
}
/**
* @param {string} txt
* @returns {string}
*/
function green(txt) {
return '\x1b[32m' + txt + '\x1b[0m';
}
/**
* @typedef {{
* slots: boolean,
* cslots: boolean,
* events: boolean,
* cevents: boolean,
* bubbles: boolean,
* dispatcher: boolean,
* bc: boolean
* }} Stat
*
* @typedef {(stats:Map<string,Stat>)=>string} Generator
*/
/**
* @param {Map<string,Stat>} stats
* @param {string} name
*/
async function generate_report(stats, name) {
let content = `<!doctype html>
<html>
<head>
<title>Svelte4-BC Report</title>
<style>
table {
width: 100%;
border: 1px solid #000;
border-spacing: 0;
}
thead {
position: sticky;
top: 0;
background: #f1f1f1;
color: #000;
border: 1px solid red;
}
thead > tr > th {
border-bottom: 1px solid #000;
}
td, th {
padding: 4px;
text-align: center;
}
td:first-child, th:first-child {
text-align: left;
}
tbody > tr:nth-child(odd) {
background-color: #f9f9f9;
}
tbody > tr:hover {
background-color: #bae1ff;
}
</style>
</head>
<body>
<h1>Svelte4-BC Report</h1>
<table>
<thead>
<tr>
<th>File</th>
<th><slots/></th>
<th>slot="*"</th>
<th>bubbles</th>
<th>on:event</th>
<th>comp on:event</th>
<th>dispatch</th>
<th>BC</th>
</tr>
</thead>
<tbody>
`;
for (const [k, v] of stats.entries()) {
content += `
<tr>
<td>${k}</td>
<td>${v.slots?'🚫':'✅'}</td>
<td>${v.cslots?'🚫':'✅'}</td>
<td>${v.bubbles?'🚫':'✅'}</td>
<td>${v.events?'🚫':'✅'}</td>
<td>${v.cevents?'🚫':'✅'}</td>
<td>${v.dispatcher?'🚫':'✅'}</td>
<td>${v.bc?'🛠':''}</td>
</tr>`
}
content += `
</tbody>
</table>
</body>
</html>`;
return await fs.writeFile(name, content);
}
/**
* Svelte4-BC vite plugin
* @param {import("./plugin.js").Svelte4BPluginConfig|boolean} [conf]
* @returns { {
* name: string,
* config:(conf:any,env:any)=>void,
* transform: (code: string, id: string, options?: {ssr?:boolean})=>string|undefined,
* buildStart: ()=>void,
* closeBundle: () => void,
* }}
*/
export function svelte4BCPlugin(conf={}) {
if (typeof conf === 'boolean') {
conf = {logs: conf};
}
const regex = /function (.+)\(\$\$((anchor)|(payload)), \$\$props\) {/;
const prefix = gray('[Svelte4-BC]');
const server = blue('server');
const client = blue('client');
const show_logs = !!conf.logs;
const $$slots_regexp = /\$\$slots: {[^}]*?{/gs
let build = 0;
const gen_report = !!conf.report;
const report_name = './svelte4-bc-report.html'
/** @type {Map<string,Stat>} */
const stats = new Map();
let is_dev = false;
let mode = 'PROD';
return {
name: 'svelte4-bc', // required, will show up in warnings and errors
config: (conf, env) => {
is_dev = env.mode === 'development';
mode = is_dev ? green('DEV') : (blue('PROD' + '/' + conf.build.ssr ? 'SSR' : 'client'));
if (show_logs) {
console.info(`${prefix} Build in ${mode} mode`);
}
},
buildStart() {
build++;
},
async closeBundle() {
build--;
if (build === 0 && gen_report) {
await generate_report(stats, report_name);
if (show_logs) {
console.info(`${prefix} Generate report into ${green(report_name)}`);
}
}
},
transform(code, id, options) {
if (!id.endsWith('.svelte') || id.includes("node_modules")) {
return;
}
const bc = code.includes('\nexport const svelte4_bc =');
if (gen_report) {
const ssr = options?.ssr === true;
let r = stats.get(id);
if (!r) {
r = {slots: false, cslots: false, bubbles: false, events: false, cevents: false, dispatcher: false, bc};
stats.set(id, r);
}
r.slots ||= code.includes('$.slot(');
r.cslots ||= code.match($$slots_regexp)!==null;
if (!ssr) {
r.events ||= code.includes('$.event(');
r.cevents ||= code.includes('$$events:');
r.bubbles ||= code.includes('$.bubble_event.call');
r.dispatcher ||= code.includes('createEventDispatcher');
}
}
if (bc) {
if (show_logs) {
const ssr = options?.ssr === true;
console.info(`${prefix} Transform ${ssr ? server : client}/${mode} for ${blue(id)}`);
}
if (code.includes('$.slot(')) {
throw new Error('Cannot use both `svelte4_bc` and `<slot/>` !');
}
if (code.includes('$.event(')) {
throw new Error('Cannot use both `svelte4_bc` and `on:event` directive !');
}
let import_name = 'svelte4_bc_convert';
let svelte4_bc_convert = import_name;
while (code.includes(svelte4_bc_convert)) {
svelte4_bc_convert += '1';
}
if (svelte4_bc_convert != import_name) {
import_name += ' as ' + svelte4_bc_convert;
}
const componentName = is_dev ? `, "${id.replaceAll('"', '_')}"` : '';
// In dev mode $$props is a proxy, so he must be reassigned
// This is useless in prod mode
const assign = is_dev ? '$$props = ' : '';
return (
`import { ${import_name} } from "svelte4-bc";\n` +
code.replace(regex, (match) => {
return match + `${assign}${svelte4_bc_convert}($$props, svelte4_bc${componentName});`;
})
);
}
}
};
}