assistant-stream/dist/core/utils/stream/LineDecoderStream.js

Streaming utilities for AI assistants

// src/core/utils/stream/LineDecoderStream.ts
const DEFAULT_MAX_LINE_LENGTH = 16777216;
var LineDecoderStream = class extends TransformStream {
	buffer = "";
	skipNextLineFeed = false;
	constructor(options) {
		const maxLineLength = options?.maxLineLength ?? DEFAULT_MAX_LINE_LENGTH;
		if (!Number.isSafeInteger(maxLineLength) || maxLineLength <= 0) throw new RangeError("maxLineLength must be a positive safe integer");
		super({
			transform: (chunk, controller) => {
				let lineStart = 0;
				for (let i = 0; i < chunk.length; i++) {
					const character = chunk[i];
					if (this.skipNextLineFeed) {
						this.skipNextLineFeed = false;
						if (character === "\n") {
							lineStart = i + 1;
							continue;
						}
					}
					if (character === "\n" || character === "\r") {
						this.append(chunk.slice(lineStart, i), maxLineLength);
						controller.enqueue(this.buffer);
						this.buffer = "";
						this.skipNextLineFeed = character === "\r";
						lineStart = i + 1;
					}
				}
				this.append(chunk.slice(lineStart), maxLineLength);
			},
			flush: () => {
				if (this.buffer) throw new Error(`Stream ended with an incomplete line (${this.buffer.length} characters)`);
			}
		});
	}
	append(value, maxLineLength) {
		const nextLength = this.buffer.length + value.length;
		if (nextLength > maxLineLength) {
			this.buffer = "";
			throw new Error(`Stream line exceeds maxLineLength (${nextLength} > ${maxLineLength})`);
		}
		this.buffer += value;
	}
};
export { LineDecoderStream };

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