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index.js
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index.js
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import { existsSync, readFileSync, writeFileSync } from 'fs';
import { posix } from 'path';
import { execSync } from 'child_process';
import esbuild from 'esbuild';
import toml from '@iarna/toml';
import { fileURLToPath } from 'url';
/** @type {import('.')} */
export default function () {
return {
name: '@sveltejs/adapter-cloudflare-workers',
async adapt(builder) {
const { site } = validate_config(builder);
// @ts-ignore
const { bucket } = site;
// @ts-ignore
const entrypoint = site['entry-point'] || 'workers-site';
const files = fileURLToPath(new URL('./files', import.meta.url).href);
const tmp = builder.getBuildDirectory('cloudflare-workers-tmp');
builder.rimraf(bucket);
builder.rimraf(entrypoint);
builder.log.info('Installing worker dependencies...');
builder.copy(`${files}/_package.json`, `${tmp}/package.json`);
// TODO would be cool if we could make this step unnecessary somehow
const stdout = execSync('npm install', { cwd: tmp });
builder.log.info(stdout.toString());
builder.log.minor('Generating worker...');
const relativePath = posix.relative(tmp, builder.getServerDirectory());
builder.copy(`${files}/entry.js`, `${tmp}/entry.js`, {
replace: {
SERVER: `${relativePath}/index.js`,
MANIFEST: './manifest.js'
}
});
writeFileSync(
`${tmp}/manifest.js`,
`export const manifest = ${builder.generateManifest({
relativePath
})};\n\nexport const prerendered = new Set(${JSON.stringify(builder.prerendered.paths)});\n`
);
await esbuild.build({
entryPoints: [`${tmp}/entry.js`],
outfile: `${entrypoint}/index.js`,
bundle: true,
target: 'es2020',
platform: 'browser'
});
writeFileSync(`${entrypoint}/package.json`, JSON.stringify({ main: 'index.js' }));
builder.log.minor('Copying assets...');
builder.writeClient(bucket);
builder.writeStatic(bucket);
builder.writePrerendered(bucket);
}
};
}
/** @param {import('@sveltejs/kit').Builder} builder */
function validate_config(builder) {
if (existsSync('wrangler.toml')) {
let wrangler_config;
try {
wrangler_config = toml.parse(readFileSync('wrangler.toml', 'utf-8'));
} catch (err) {
err.message = `Error parsing wrangler.toml: ${err.message}`;
throw err;
}
// @ts-ignore
if (!wrangler_config.site || !wrangler_config.site.bucket) {
throw new Error(
'You must specify site.bucket in wrangler.toml. Consult https://developers.cloudflare.com/workers/platform/sites/configuration'
);
}
return wrangler_config;
}
builder.log.error(
'Consult https://developers.cloudflare.com/workers/platform/sites/configuration on how to setup your site'
);
builder.log(
`
Sample wrangler.toml:
name = "<your-site-name>"
type = "javascript"
account_id = "<your-account-id>"
workers_dev = true
route = ""
zone_id = ""
[site]
bucket = "./.cloudflare/assets"
entry-point = "./.cloudflare/worker"`
.replace(/^\t+/gm, '')
.trim()
);
throw new Error('Missing a wrangler.toml file');
}