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build_server.js
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build_server.js
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import fs from 'fs';
import path from 'path';
import { mkdirp, posixify } from '../../utils/filesystem.js';
import { get_vite_config, merge_vite_configs, resolve_entry } from '../utils.js';
import { load_template } from '../../core/config/index.js';
import { get_runtime_directory } from '../../core/utils.js';
import {
create_build,
find_deps,
get_default_config,
remove_svelte_kit,
is_http_method
} from './utils.js';
import { s } from '../../utils/misc.js';
/**
* @param {{
* hooks: string;
* config: import('types').ValidatedConfig;
* has_service_worker: boolean;
* runtime: string;
* template: string;
* }} opts
*/
const server_template = ({ config, hooks, has_service_worker, runtime, template }) => `
import root from '__GENERATED__/root.svelte';
import { respond } from '${runtime}/server/index.js';
import { set_paths, assets, base } from '${runtime}/paths.js';
import { set_prerendering } from '${runtime}/env.js';
const template = ({ head, body, assets, nonce }) => ${s(template)
.replace('%sveltekit.head%', '" + head + "')
.replace('%sveltekit.body%', '" + body + "')
.replace(/%sveltekit\.assets%/g, '" + assets + "')
.replace(/%sveltekit\.nonce%/g, '" + nonce + "')};
let read = null;
set_paths(${s(config.kit.paths)});
let default_protocol = 'https';
// allow paths to be globally overridden
// in svelte-kit preview and in prerendering
export function override(settings) {
default_protocol = settings.protocol || default_protocol;
set_paths(settings.paths);
set_prerendering(settings.prerendering);
read = settings.read;
}
export class Server {
constructor(manifest) {
this.options = {
csp: ${s(config.kit.csp)},
dev: false,
get_stack: error => String(error), // for security
handle_error: (error, event) => {
this.options.hooks.handleError({
error,
event,
// TODO remove for 1.0
// @ts-expect-error
get request() {
throw new Error('request in handleError has been replaced with event. See https://github.com/sveltejs/kit/pull/3384 for details');
}
});
error.stack = this.options.get_stack(error);
},
hooks: null,
hydrate: ${s(config.kit.browser.hydrate)},
manifest,
method_override: ${s(config.kit.methodOverride)},
paths: { base, assets },
prefix: assets + '/',
prerender: {
default: ${config.kit.prerender.default},
enabled: ${config.kit.prerender.enabled}
},
read,
root,
service_worker: ${has_service_worker ? "base + '/service-worker.js'" : 'null'},
router: ${s(config.kit.browser.router)},
template,
template_contains_nonce: ${template.includes('%sveltekit.nonce%')},
trailing_slash: ${s(config.kit.trailingSlash)}
};
}
async respond(request, options = {}) {
if (!(request instanceof Request)) {
throw new Error('The first argument to server.respond must be a Request object. See https://github.com/sveltejs/kit/pull/3384 for details');
}
if (!this.options.hooks) {
const module = await import(${s(hooks)});
this.options.hooks = {
getSession: module.getSession || (() => ({})),
handle: module.handle || (({ event, resolve }) => resolve(event)),
handleError: module.handleError || (({ error }) => console.error(error.stack)),
externalFetch: module.externalFetch || fetch
};
}
return respond(request, this.options, options);
}
}
`;
/**
* @param {{
* cwd: string;
* config: import('types').ValidatedConfig
* vite_config_env: import('vite').ConfigEnv
* manifest_data: import('types').ManifestData
* build_dir: string;
* output_dir: string;
* service_worker_entry_file: string | null;
* }} options
* @param {{ vite_manifest: import('vite').Manifest, assets: import('rollup').OutputAsset[] }} client
*/
export async function build_server(options, client) {
const {
cwd,
config,
vite_config_env,
manifest_data,
build_dir,
output_dir,
service_worker_entry_file
} = options;
let hooks_file = resolve_entry(config.kit.files.hooks);
if (!hooks_file || !fs.existsSync(hooks_file)) {
hooks_file = path.join(config.kit.outDir, 'build/hooks.js');
fs.writeFileSync(hooks_file, '');
}
/** @type {Record<string, string>} */
const input = {
index: `${build_dir}/index.js`
};
// add entry points for every endpoint...
manifest_data.routes.forEach((route) => {
const file = route.type === 'endpoint' ? route.file : route.shadow;
if (file) {
const resolved = path.resolve(cwd, file);
const relative = decodeURIComponent(path.relative(config.kit.files.routes, resolved));
const name = posixify(path.join('entries/endpoints', relative.replace(/\.js$/, '')));
input[name] = resolved;
}
});
// ...and every component used by pages...
manifest_data.components.forEach((file) => {
const resolved = path.resolve(cwd, file);
const relative = decodeURIComponent(path.relative(config.kit.files.routes, resolved));
const name = relative.startsWith('..')
? posixify(path.join('entries/fallbacks', path.basename(file)))
: posixify(path.join('entries/pages', relative));
input[name] = resolved;
});
// ...and every matcher
Object.entries(manifest_data.matchers).forEach(([key, file]) => {
const name = posixify(path.join('entries/matchers', key));
input[name] = path.resolve(cwd, file);
});
/** @type {(file: string) => string} */
const app_relative = (file) => {
const relative_file = path.relative(build_dir, path.resolve(cwd, file));
return relative_file[0] === '.' ? relative_file : `./${relative_file}`;
};
fs.writeFileSync(
input.index,
server_template({
config,
hooks: app_relative(hooks_file),
has_service_worker: config.kit.serviceWorker.register && !!service_worker_entry_file,
runtime: posixify(path.relative(build_dir, get_runtime_directory(config.kit))),
template: load_template(cwd, config)
})
);
const vite_config = await get_vite_config(vite_config_env);
const merged_config = merge_vite_configs(
get_default_config({ config, input, ssr: true, outDir: `${output_dir}/server` }),
vite_config
);
remove_svelte_kit(merged_config);
const { chunks } = await create_build(merged_config);
/** @type {import('vite').Manifest} */
const vite_manifest = JSON.parse(fs.readFileSync(`${output_dir}/server/manifest.json`, 'utf-8'));
mkdirp(`${output_dir}/server/nodes`);
mkdirp(`${output_dir}/server/stylesheets`);
const stylesheet_lookup = new Map();
client.assets.forEach((asset) => {
if (asset.fileName.endsWith('.css')) {
if (asset.source.length < config.kit.inlineStyleThreshold) {
const index = stylesheet_lookup.size;
const file = `${output_dir}/server/stylesheets/${index}.js`;
fs.writeFileSync(file, `// ${asset.fileName}\nexport default ${s(asset.source)};`);
stylesheet_lookup.set(asset.fileName, index);
}
}
});
manifest_data.components.forEach((component, i) => {
const entry = find_deps(client.vite_manifest, component, true);
const imports = [`import * as module from '../${vite_manifest[component].file}';`];
const exports = [
'export { module };',
`export const index = ${i};`,
`export const file = '${entry.file}';`,
`export const imports = ${s(entry.imports)};`,
`export const stylesheets = ${s(entry.stylesheets)};`
];
/** @type {string[]} */
const styles = [];
entry.stylesheets.forEach((file) => {
if (stylesheet_lookup.has(file)) {
const index = stylesheet_lookup.get(file);
const name = `stylesheet_${index}`;
imports.push(`import ${name} from '../stylesheets/${index}.js';`);
styles.push(`\t${s(file)}: ${name}`);
}
});
if (styles.length > 0) {
exports.push(`export const inline_styles = () => ({\n${styles.join(',\n')}\n});`);
}
const out = `${output_dir}/server/nodes/${i}.js`;
fs.writeFileSync(out, `${imports.join('\n')}\n\n${exports.join('\n')}\n`);
});
return {
chunks,
vite_manifest,
methods: get_methods(cwd, chunks, manifest_data)
};
}
/**
* @param {string} cwd
* @param {import('rollup').OutputChunk[]} output
* @param {import('types').ManifestData} manifest_data
*/
function get_methods(cwd, output, manifest_data) {
/** @type {Record<string, string[]>} */
const lookup = {};
output.forEach((chunk) => {
if (!chunk.facadeModuleId) return;
const id = chunk.facadeModuleId.slice(cwd.length + 1);
lookup[id] = chunk.exports;
});
/** @type {Record<string, import('types').HttpMethod[]>} */
const methods = {};
manifest_data.routes.forEach((route) => {
const file = route.type === 'endpoint' ? route.file : route.shadow;
if (file && lookup[file]) {
methods[file] = lookup[file].filter(is_http_method);
}
});
return methods;
}