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dev-bundler.ts
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dev-bundler.ts
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import { pathToFileURL } from 'url'
import { existsSync } from 'fs'
import { resolve } from 'pathe'
import * as vite from 'vite'
import { ExternalsOptions, isExternal as _isExternal, ExternalsDefaults } from 'externality'
import { hashId, uniq } from './utils'
export interface TransformChunk {
id: string,
code: string,
deps: string[],
parents: string[]
}
export interface SSRTransformResult {
code: string,
map: object,
deps: string[]
dynamicDeps: string[]
}
export interface TransformOptions {
viteServer: vite.ViteDevServer
}
function isExternal (opts: TransformOptions, id: string) {
// Externals
const ssrConfig = (opts.viteServer.config as any).ssr
const externalOpts: ExternalsOptions = {
inline: [
/virtual:/,
/\.ts$/,
...ExternalsDefaults.inline,
...ssrConfig.noExternal
],
external: [
...ssrConfig.external,
/node_modules/
],
resolve: {
type: 'module',
extensions: ['.ts', '.js', '.json', '.vue', '.mjs', '.jsx', '.tsx', '.wasm']
}
}
return _isExternal(id, opts.viteServer.config.root, externalOpts)
}
async function transformRequest (opts: TransformOptions, id: string) {
// Virtual modules start with `\0`
if (id && id.startsWith('/@id/__x00__')) {
id = '\0' + id.slice('/@id/__x00__'.length)
}
if (id && id.startsWith('/@id/')) {
id = id.slice('/@id/'.length)
}
if (id && id.startsWith('/@fs/')) {
// Absolute path
id = id.slice('/@fs'.length)
// On Windows, this may be `/C:/my/path` at this point, in which case we want to remove the `/`
if (id.match(/^\/\w:/)) {
id = id.slice(1)
}
} else if (!id.includes('entry') && id.startsWith('/')) {
// Relative to the root directory
const resolvedPath = resolve(opts.viteServer.config.root, '.' + id)
if (existsSync(resolvedPath)) {
id = resolvedPath
}
}
if (await isExternal(opts, id)) {
return {
code: `(global, exports, importMeta, ssrImport, ssrDynamicImport, ssrExportAll) => import('${(pathToFileURL(id))}').then(r => { exports.default = r.default; ssrExportAll(r) })`,
deps: [],
dynamicDeps: []
}
}
// Transform
const res: SSRTransformResult = await opts.viteServer.transformRequest(id, { ssr: true }).catch((err) => {
// eslint-disable-next-line no-console
console.warn(`[SSR] Error transforming ${id}: ${err}`)
// console.error(err)
}) as SSRTransformResult || { code: '', map: {}, deps: [], dynamicDeps: [] }
// Wrap into a vite module
const code = `async function (global, __vite_ssr_exports__, __vite_ssr_import_meta__, __vite_ssr_import__, __vite_ssr_dynamic_import__, __vite_ssr_exportAll__) {
${res.code || '/* empty */'};
}`
return { code, deps: res.deps || [], dynamicDeps: res.dynamicDeps || [] }
}
async function transformRequestRecursive (opts: TransformOptions, id, parent = '<entry>', chunks: Record<string, TransformChunk> = {}) {
if (chunks[id]) {
chunks[id].parents.push(parent)
return
}
const res = await transformRequest(opts, id)
const deps = uniq([...res.deps, ...res.dynamicDeps])
chunks[id] = {
id,
code: res.code,
deps,
parents: [parent]
} as TransformChunk
for (const dep of deps) {
await transformRequestRecursive(opts, dep, id, chunks)
}
return Object.values(chunks)
}
export async function bundleRequest (opts: TransformOptions, entryURL: string) {
const chunks = await transformRequestRecursive(opts, entryURL)
const listIds = (ids: string[]) => ids.map(id => `// - ${id} (${hashId(id)})`).join('\n')
const chunksCode = chunks.map(chunk => `
// --------------------
// Request: ${chunk.id}
// Parents: \n${listIds(chunk.parents)}
// Dependencies: \n${listIds(chunk.deps)}
// --------------------
const ${hashId(chunk.id)} = ${chunk.code}
`).join('\n')
const manifestCode = 'const __modules__ = {\n' +
chunks.map(chunk => ` '${chunk.id}': ${hashId(chunk.id)}`).join(',\n') + '\n}'
// https://github.com/vitejs/vite/blob/main/packages/vite/src/node/ssr/ssrModuleLoader.ts
const ssrModuleLoader = `
const __pendingModules__ = new Map()
const __pendingImports__ = new Map()
const __ssrContext__ = { global: globalThis }
function __ssrLoadModule__(url, urlStack = []) {
const pendingModule = __pendingModules__.get(url)
if (pendingModule) { return pendingModule }
const modulePromise = __instantiateModule__(url, urlStack)
__pendingModules__.set(url, modulePromise)
modulePromise.catch(() => { __pendingModules__.delete(url) })
.finally(() => { __pendingModules__.delete(url) })
return modulePromise
}
async function __instantiateModule__(url, urlStack) {
const mod = __modules__[url]
if (mod.stubModule) { return mod.stubModule }
const stubModule = { [Symbol.toStringTag]: 'Module' }
Object.defineProperty(stubModule, '__esModule', { value: true })
mod.stubModule = stubModule
// https://vitejs.dev/guide/api-hmr.html
const importMeta = { url, hot: { accept() {}, prune() {}, dispose() {}, invalidate() {}, decline() {}, on() {} } }
urlStack = urlStack.concat(url)
const isCircular = url => urlStack.includes(url)
const pendingDeps = []
const ssrImport = async (dep) => {
// TODO: Handle externals if dep[0] !== '.' | '/'
if (!isCircular(dep) && !__pendingImports__.get(dep)?.some(isCircular)) {
pendingDeps.push(dep)
if (pendingDeps.length === 1) {
__pendingImports__.set(url, pendingDeps)
}
await __ssrLoadModule__(dep, urlStack)
if (pendingDeps.length === 1) {
__pendingImports__.delete(url)
} else {
pendingDeps.splice(pendingDeps.indexOf(dep), 1)
}
}
return __modules__[dep].stubModule
}
function ssrDynamicImport (dep) {
// TODO: Handle dynamic import starting with . relative to url
return ssrImport(dep)
}
function ssrExportAll(sourceModule) {
for (const key in sourceModule) {
if (key !== 'default') {
try {
Object.defineProperty(stubModule, key, {
enumerable: true,
configurable: true,
get() { return sourceModule[key] }
})
} catch (_err) { }
}
}
}
await mod(
__ssrContext__.global,
stubModule,
importMeta,
ssrImport,
ssrDynamicImport,
ssrExportAll
)
return stubModule
}
`
const code = [
chunksCode,
manifestCode,
ssrModuleLoader,
`export default await __ssrLoadModule__('${entryURL}')`
].join('\n\n')
return {
code,
ids: chunks.map(i => i.id)
}
}