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rollupPlugin.ts
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rollupPlugin.ts
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/* eslint-disable global-require */
/* eslint-disable no-param-reassign */
import path, { sep } from 'path';
import CleanCSS from 'clean-css';
import { Plugin } from 'rollup';
import { compile, preprocess } from 'svelte/compiler';
import sparkMd5 from 'spark-md5';
import fs from 'fs-extra';
import devalue from 'devalue';
import btoa from 'btoa';
// eslint-disable-next-line import/no-unresolved
import { CompileOptions } from 'svelte/types/compiler/interfaces';
import del from 'del';
import { fork, ChildProcess } from 'child_process';
import chokidar from 'chokidar';
import partialHydration from '../partialHydration/partialHydration';
import windowsPathFix from '../utils/windowsPathFix';
import { SettingsOptions } from '../utils/types';
const mapIntro = `/*# sourceMappingURL=data:application/json;charset=utf-8;base64,`;
export const encodeSourceMap = (map) => {
if (!map || !map.toString) return '';
return `${mapIntro}${btoa(map.toString())} */`;
};
export const cssFilePriority = (pathStr) => {
const normalizedPath = windowsPathFix(pathStr);
if (normalizedPath.includes('node_modules')) return 6;
if (normalizedPath.includes('src/layouts')) return 3;
if (normalizedPath.includes('src/routes')) return 2;
if (normalizedPath.includes('src/components')) return 1;
return 0;
};
export function logDependency(importee, importer, memoryCache) {
if (importee === 'svelte/internal' || importee === 'svelte') return;
if (importer) {
const parsedImporter = path.parse(importer);
// The following two expressions are used to determine if we are trying to import
// a svelte file from an external dependency and ensure that we add the correct path to that dependency
const externalDependencyImport = path.resolve(
parsedImporter.dir.substr(0, parsedImporter.dir.lastIndexOf('src')),
'node_modules',
importee,
);
const isExternalDependency = fs.pathExistsSync(externalDependencyImport);
if (!memoryCache.dependencies[importer]) memoryCache.dependencies[importer] = new Set();
if (importee.includes('node_modules')) {
memoryCache.dependencies[importer].add(importee);
} else if (importer.includes('node_modules')) {
const fullImportee = path.resolve(parsedImporter.dir, importee);
memoryCache.dependencies[importer].add(fullImportee);
} else if (importee.includes('.svelte') && isExternalDependency) {
memoryCache.dependencies[importer].add(externalDependencyImport);
} else if ((parsedImporter.ext === '.svelte' && importee.includes('.svelte')) || importee.includes('.css')) {
const fullImportee = path.resolve(parsedImporter.dir, importee);
memoryCache.dependencies[importer].add(fullImportee);
} else {
memoryCache.dependencies[importer].add(importee);
}
}
}
export const getDependencies = (file, memoryCache) => {
let dependencies = new Set([file]);
if (memoryCache.dependencies[file]) {
[...memoryCache.dependencies[file].values()]
.filter((d) => d !== file)
.forEach((dependency) => {
dependencies = new Set([...dependencies, ...getDependencies(dependency, memoryCache)]);
});
}
return [...dependencies.values()];
};
export const sortCss = (css) => {
return css
.sort((a, b) => b[1].priority - a[1].priority)
.reduce((out, cv) => {
const o = {};
o[cv[0]] = { styles: cv[1].code, sourceMap: cv[1].map };
out.push(o);
return out;
}, []);
};
export const getCssFromCache = (arr, rollupCache) => {
const css = [];
for (const id of arr) {
if (rollupCache.has(`css${id}`)) css.push([id, rollupCache.get(`css${id}`)]);
}
return css;
};
// eslint-disable-next-line consistent-return
export function load(id) {
const extension = path.extname(id);
// capture imported css
if (extension === '.css') {
const code = fs.readFileSync(id, 'utf-8');
this.cache.set(`css${id}`, {
code,
map: '',
priority: 5,
});
return '';
}
}
export type RollupCacheElder = {
dependencies: {
[name: string]: Set<string>;
};
};
let cache: RollupCacheElder = {
dependencies: {},
};
const production = process.env.NODE_ENV === 'production' || !process.env.ROLLUP_WATCH;
let srcWatcher;
export interface IElderjsRollupConfig {
type: 'ssr' | 'client';
svelteConfig: any;
legacy?: boolean;
elderConfig: SettingsOptions;
startDevServer?: boolean;
}
export default function elderjsRollup({
elderConfig,
svelteConfig,
type = 'ssr',
legacy = false,
startDevServer = false,
}: IElderjsRollupConfig): Partial<Plugin> {
const cleanCss = new CleanCSS({
sourceMap: !production,
sourceMapInlineSources: !production,
level: 1,
rebaseTo: elderConfig.$$internal.distElder,
});
const compilerOptions: CompileOptions = {
hydratable: true,
generate: 'ssr',
css: false,
dev: !production,
legacy: false,
format: 'esm',
};
if (type === 'client') {
compilerOptions.generate = 'dom';
compilerOptions.format = 'esm';
}
if (legacy) {
compilerOptions.legacy = true;
}
const extensions = (svelteConfig && svelteConfig.extensions) || ['.svelte'];
const preprocessors =
svelteConfig && Array.isArray(svelteConfig.preprocess)
? [...svelteConfig.preprocess, partialHydration]
: [partialHydration];
async function prepareCss(css = []) {
const sorted = sortCss(css);
return {
...cleanCss.minify(sorted),
included: sorted ? sorted.map((m) => Object.keys(m)[0]) : [],
};
}
let styleCssHash;
let styleCssMapHash;
/**
* Dev server bootstrapping and restarting.
*/
let childProcess: ChildProcess;
let bootingServer = false;
function forkServer(count = 0) {
if (production) return;
if (!bootingServer) {
bootingServer = true;
const serverJs = path.resolve(process.cwd(), elderConfig.srcDir, './server.js');
if (!fs.existsSync(serverJs)) {
console.error(`No server file found at ${serverJs}, unable to start dev server.`);
return;
}
setTimeout(() => {
// prevent multiple calls
if (childProcess) childProcess.kill('SIGINT');
bootingServer = false;
childProcess = fork(serverJs);
childProcess.on('exit', (code) => {
if (code !== null) {
console.log(`> Elder.js process exited with code ${code}`);
}
});
childProcess.on('error', (err) => {
console.error(err);
if (count < 1) {
forkServer(count + 1);
}
});
}, 10);
}
}
function handleChange(watchedPath) {
const parsed = path.parse(watchedPath);
if (parsed.ext !== '.svelte') {
// prevents double reload as the compiled svelte templates are output
forkServer();
}
}
function startServerAndWatcher() {
// notes: This is hard to reason about.
// This should only after the initial client rollup as finished as it runs last. The srcWatcher should then live between reloads
// until the watch process is killed.
//
// this should watch the ./src, elder.config.js, and the client side folders... trigging a restart of the server when something changes
// We don't want to change when a svelte file changes because it will cause a double reload when rollup outputs the rebundled file.
if (!production && type === 'client' && !srcWatcher && startDevServer) {
srcWatcher = chokidar.watch(
[
path.resolve(process.cwd(), './src'),
path.resolve(process.cwd(), './elder.config.js'),
elderConfig.$$internal.distElder,
path.join(elderConfig.$$internal.ssrComponents, 'components'),
path.join(elderConfig.$$internal.ssrComponents, 'layouts'),
path.join(elderConfig.$$internal.ssrComponents, 'routes'),
],
{
ignored: '*.svelte',
usePolling: !/^(win32|darwin)$/.test(process.platform),
},
);
srcWatcher.on('change', handleChange);
srcWatcher.on('add', handleChange);
forkServer();
}
}
return {
name: 'rollup-plugin-elder',
watchChange(id) {
// clean out dependency relationships on a file change.
const prior = this.cache.get('dependencies');
prior[id] = new Set();
if (!cache) cache = { dependencies: {} };
cache.dependencies = prior;
},
/**
* Essentially what is happening here is that we need to say we're going to
* emit these files before we know the content.
* We are given a hash that we later use to populate them with data.
*/
buildStart() {
// kill server to prevent failures.
if (childProcess) childProcess.kill('SIGINT');
// create placeholder files to be filled later.
if (type === 'ssr') {
styleCssHash = this.emitFile({
type: 'asset',
name: 'svelte.css',
});
if (!production) {
styleCssMapHash = this.emitFile({
type: 'asset',
name: 'svelte.css.map',
});
}
}
// cleaning up folders that need to be deleted.
// this shouldn't happen on legacy as it runs last and would result in deleting needed code.
if (type === 'ssr' && legacy === false) {
del.sync(elderConfig.$$internal.ssrComponents);
del.sync(path.resolve(elderConfig.$$internal.distElder, `.${sep}assets${sep}`));
} else if (type === 'client' && legacy === false) {
del.sync(path.resolve(elderConfig.$$internal.distElder, `.${sep}svelte${sep}`));
}
},
resolveId(importee, importer) {
// build list of dependencies so we know what CSS to inject into the export.
logDependency(importee, importer, cache);
// below largely adapted from the rollup svelte plugin
// ----------------------------------------------
if (!importer || importee[0] === '.' || importee[0] === '\0' || path.isAbsolute(importee)) return null;
// if this is a bare import, see if there's a valid pkg.svelte
const parts = importee.split('/');
let dir;
let pkg;
let name = parts.shift();
if (name[0] === '@') {
name += `/${parts.shift()}`;
}
try {
const file = `.${path.sep}${['node_modules', name, 'package.json'].join(path.sep)}`;
const resolved = path.resolve(process.cwd(), file);
dir = path.dirname(resolved);
// eslint-disable-next-line import/no-dynamic-require
pkg = require(resolved);
} catch (err) {
if (err.code === 'MODULE_NOT_FOUND') {
if (err.message && name !== 'svelte') console.log(err);
return null;
}
throw err;
}
// use pkg.svelte
if (parts.length === 0 && pkg.svelte) {
const svelteResolve = path.resolve(dir, pkg.svelte);
// console.log('-----------------', svelteResolve, name);
logDependency(svelteResolve, name, cache);
return svelteResolve;
}
return null;
},
load,
async transform(code, id) {
try {
const extension = path.extname(id);
// eslint-disable-next-line no-bitwise
if (!~extensions.indexOf(extension)) return null;
// look in the cache
const digest = sparkMd5.hash(code + JSON.stringify(compilerOptions));
if (this.cache.has(digest)) {
return this.cache.get(digest);
}
const filename = path.relative(elderConfig.rootDir, id);
const processed = await preprocess(code, preprocessors, { filename });
// @ts-ignore - these types aren't in the type files... but if we don't pass in a map things break.
if (processed.map) compilerOptions.sourcemap = processed.map;
const compiled = await compile(processed.code, { ...compilerOptions, filename });
(compiled.warnings || []).forEach((warning) => {
if (warning.code === 'css-unused-selector') return;
this.warn(warning);
});
const dependencies = getDependencies(id, cache);
compiled.js.dependencies = [...dependencies, ...processed.dependencies];
if (this.addWatchFile) {
this.addWatchFile(id);
compiled.js.dependencies.map((d) => this.addWatchFile(d));
}
if (type === 'ssr') {
this.cache.set(`css${id}`, {
code: compiled.css.code || '',
map: compiled.css.map || '',
priority: cssFilePriority(id),
});
}
this.cache.set(digest, compiled.js);
return compiled.js;
} catch (e) {
console.error('> Elder.js error in rollupPlugin > transform.');
throw e;
}
},
// eslint-disable-next-line consistent-return
async renderChunk(code, chunk) {
if (chunk.isEntry) {
if (type === 'ssr') {
const trackedDeps = getDependencies(chunk.facadeModuleId, cache);
const cssEntries = getCssFromCache(trackedDeps, this.cache);
const cssOutput = await prepareCss(cssEntries);
code += `\nmodule.exports._css = ${devalue(cssOutput.styles)};`;
code += `\nmodule.exports._cssMap = ${devalue(encodeSourceMap(cssOutput.sourceMap))};`;
code += `\nmodule.exports._cssIncluded = ${JSON.stringify(
cssOutput.included.map((d) => path.relative(elderConfig.rootDir, d)),
)}`;
return { code, map: null };
}
}
},
/**
* generateBundle is used to write all of the CSS to the file system
* @param options
* @param bundle
* @param isWrite
*/
// eslint-disable-next-line consistent-return
async generateBundle() {
// IMPORTANT!!!
// all css is only available on the ssr version...
// but we need to move the css to the client folder.
if (type === 'ssr') {
const cssEntries = getCssFromCache([...this.getModuleIds()], this.cache);
const { styles, sourceMap } = await prepareCss(cssEntries);
if (styleCssMapHash) {
// set the source later when we have it.
this.setAssetSource(styleCssMapHash, sourceMap.toString());
const sourceMapFile = this.getFileName(styleCssMapHash);
const sourceMapFileRel = `/${path.relative(
elderConfig.distDir,
path.resolve(elderConfig.$$internal.distElder, sourceMapFile),
)}`;
this.setAssetSource(styleCssHash, `${styles}\n /*# sourceMappingURL=${sourceMapFileRel} */`);
} else {
this.setAssetSource(styleCssHash, styles);
}
}
},
writeBundle() {
if (type === 'ssr') {
// copy over assets from the ssr folder to the client folder
const ssrAssets = path.resolve(elderConfig.rootDir, `.${sep}___ELDER___${sep}compiled${sep}assets`);
const clientAssets = path.resolve(elderConfig.$$internal.distElder, `.${sep}assets${sep}`);
fs.ensureDirSync(clientAssets);
const open = fs.readdirSync(ssrAssets);
if (open.length > 0) {
open.forEach((name) => {
fs.copyFileSync(path.join(ssrAssets, name), path.join(clientAssets, name));
});
}
}
startServerAndWatcher();
this.cache.set('dependencies', cache.dependencies);
},
};
}