import { InvariantError } from '../../shared/lib/invariant-error';
// React's RSC prerender function will emit an incomplete flight stream when using `prerender`. If the connection
// closes then whatever hanging chunks exist will be errored. This is because prerender (an experimental feature)
// has not yet implemented a concept of resume. For now we will simulate a paused connection by wrapping the stream
// in one that doesn't close even when the underlying is complete.
export class ReactServerResult {
    constructor(stream){
        this._stream = stream;
    }
    tee() {
        if (this._stream === null) {
            throw Object.defineProperty(new Error('Cannot tee a ReactServerResult that has already been consumed'), "__NEXT_ERROR_CODE", {
                value: "E106",
                enumerable: false,
                configurable: true
            });
        }
        const tee = this._stream.tee();
        this._stream = tee[0];
        return tee[1];
    }
    consume() {
        if (this._stream === null) {
            throw Object.defineProperty(new Error('Cannot consume a ReactServerResult that has already been consumed'), "__NEXT_ERROR_CODE", {
                value: "E470",
                enumerable: false,
                configurable: true
            });
        }
        const stream = this._stream;
        this._stream = null;
        return stream;
    }
}
export async function createReactServerPrerenderResult(underlying) {
    const chunks = [];
    const { prelude } = await underlying;
    const reader = prelude.getReader();
    while(true){
        const { done, value } = await reader.read();
        if (done) {
            return new ReactServerPrerenderResult(chunks);
        } else {
            chunks.push(value);
        }
    }
}
export async function createReactServerPrerenderResultFromRender(underlying) {
    const chunks = [];
    const reader = underlying.getReader();
    while(true){
        const { done, value } = await reader.read();
        if (done) {
            break;
        } else {
            chunks.push(value);
        }
    }
    return new ReactServerPrerenderResult(chunks);
}
export class ReactServerPrerenderResult {
    assertChunks(expression) {
        if (this._chunks === null) {
            throw Object.defineProperty(new InvariantError(`Cannot \`${expression}\` on a ReactServerPrerenderResult that has already been consumed.`), "__NEXT_ERROR_CODE", {
                value: "E593",
                enumerable: false,
                configurable: true
            });
        }
        return this._chunks;
    }
    consumeChunks(expression) {
        const chunks = this.assertChunks(expression);
        this.consume();
        return chunks;
    }
    consume() {
        this._chunks = null;
    }
    constructor(chunks){
        this._chunks = chunks;
    }
    asUnclosingStream() {
        const chunks = this.assertChunks('asUnclosingStream()');
        return createUnclosingStream(chunks);
    }
    consumeAsUnclosingStream() {
        const chunks = this.consumeChunks('consumeAsUnclosingStream()');
        return createUnclosingStream(chunks);
    }
    asStream() {
        const chunks = this.assertChunks('asStream()');
        return createClosingStream(chunks);
    }
    consumeAsStream() {
        const chunks = this.consumeChunks('consumeAsStream()');
        return createClosingStream(chunks);
    }
}
function createUnclosingStream(chunks) {
    let i = 0;
    return new ReadableStream({
        async pull (controller) {
            if (i < chunks.length) {
                controller.enqueue(chunks[i++]);
            }
        // we intentionally keep the stream open. The consumer will clear
        // out chunks once finished and the remaining memory will be GC'd
        // when this object goes out of scope
        }
    });
}
function createClosingStream(chunks) {
    let i = 0;
    return new ReadableStream({
        async pull (controller) {
            if (i < chunks.length) {
                controller.enqueue(chunks[i++]);
            } else {
                controller.close();
            }
        }
    });
}
export async function processPrelude(unprocessedPrelude) {
    const [prelude, peek] = unprocessedPrelude.tee();
    const reader = peek.getReader();
    const firstResult = await reader.read();
    reader.cancel();
    const preludeIsEmpty = firstResult.done === true;
    return {
        prelude,
        preludeIsEmpty
    };
}

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