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type App,
type VNode,
createApp,
createVNode,
ssrContextKey,
ssrUtils,
} from 'vue'
import { isPromise, isString } from '@vue/shared'
import { type SSRBuffer, type SSRContext, renderComponentVNode } from './render'
import type { Readable, Writable } from 'node:stream'
import { resolveTeleports } from './renderToString'
const { isVNode } = ssrUtils
export interface SimpleReadable {
push(chunk: string | null): void
destroy(err: any): void
}
async function unrollBuffer(
buffer: SSRBuffer,
stream: SimpleReadable,
): Promise<void> {
if (buffer.hasAsync) {
for (let i = 0; i < buffer.length; i++) {
let item = buffer[i]
if (isPromise(item)) {
item = await item
}
if (isString(item)) {
stream.push(item)
} else {
await unrollBuffer(item, stream)
}
}
} else {
// sync buffer can be more efficiently unrolled without unnecessary await
// ticks
unrollBufferSync(buffer, stream)
}
}
function unrollBufferSync(buffer: SSRBuffer, stream: SimpleReadable) {
for (let i = 0; i < buffer.length; i++) {
let item = buffer[i]
if (isString(item)) {
stream.push(item)
} else {
// since this is a sync buffer, child buffers are never promises
unrollBufferSync(item as SSRBuffer, stream)
}
}
}
export function renderToSimpleStream<T extends SimpleReadable>(
input: App | VNode,
context: SSRContext,
stream: T,
): T {
if (isVNode(input)) {
// raw vnode, wrap with app (for context)
return renderToSimpleStream(
createApp({ render: () => input }),
context,
stream,
)
}
// rendering an app
const vnode = createVNode(input._component, input._props)
vnode.appContext = input._context
// provide the ssr context to the tree
input.provide(ssrContextKey, context)
Promise.resolve(renderComponentVNode(vnode))
.then(buffer => unrollBuffer(buffer, stream))
.then(() => resolveTeleports(context))
.then(() => {
if (context.__watcherHandles) {
for (const unwatch of context.__watcherHandles) {
unwatch()
}
}
})
.then(() => stream.push(null))
.catch(error => {
stream.destroy(error)
})
return stream
}
/**
* @deprecated
*/
export function renderToStream(
input: App | VNode,
context: SSRContext = {},
): Readable {
console.warn(
`[@vue/server-renderer] renderToStream is deprecated - use renderToNodeStream instead.`,
)
return renderToNodeStream(input, context)
}
export function renderToNodeStream(
input: App | VNode,
context: SSRContext = {},
): Readable {
const stream: Readable = __CJS__
? new (require('node:stream').Readable)({ read() {} })
: null
if (!stream) {
throw new Error(
`ESM build of renderToStream() does not support renderToNodeStream(). ` +
`Use pipeToNodeWritable() with an existing Node.js Writable stream ` +
`instance instead.`,
)
}
return renderToSimpleStream(input, context, stream)
}
export function pipeToNodeWritable(
input: App | VNode,
context: SSRContext | undefined = {},
writable: Writable,
): void {
renderToSimpleStream(input, context, {
push(content) {
if (content != null) {
writable.write(content)
} else {
writable.end()
}
},
destroy(err) {
writable.destroy(err)
},
})
}
export function renderToWebStream(
input: App | VNode,
context: SSRContext = {},
): ReadableStream {
if (typeof ReadableStream !== 'function') {
throw new Error(
`ReadableStream constructor is not available in the global scope. ` +
`If the target environment does support web streams, consider using ` +
`pipeToWebWritable() with an existing WritableStream instance instead.`,
)
}
const encoder = new TextEncoder()
let cancelled = false
return new ReadableStream({
start(controller) {
renderToSimpleStream(input, context, {
push(content) {
if (cancelled) return
if (content != null) {
controller.enqueue(encoder.encode(content))
} else {
controller.close()
}
},
destroy(err) {
controller.error(err)
},
})
},
cancel() {
cancelled = true
},
})
}
export function pipeToWebWritable(
input: App | VNode,
context: SSRContext | undefined = {},
writable: WritableStream,
): void {
const writer = writable.getWriter()
const encoder = new TextEncoder()
// #4287 CloudFlare workers do not implement `ready` property
let hasReady = false
try {
hasReady = isPromise(writer.ready)
} catch (e: any) {}
renderToSimpleStream(input, context, {
async push(content) {
if (hasReady) {
await writer.ready
}
if (content != null) {
return writer.write(encoder.encode(content))
} else {
return writer.close()
}
},
destroy(err) {
// TODO better error handling?
// eslint-disable-next-line no-console
console.log(err)
writer.close()
},
})
}
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