Website Structure

Frontend-Learner/node_modules/get-stream/source/contents.js

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+export const getStreamContents = async (stream, {init, convertChunk, getSize, truncateChunk, addChunk, getFinalChunk, finalize}, {maxBuffer = Number.POSITIVE_INFINITY} = {}) => {
+	if (!isAsyncIterable(stream)) {
+		throw new Error('The first argument must be a Readable, a ReadableStream, or an async iterable.');
+	}
+
+	const state = init();
+	state.length = 0;
+
+	try {
+		for await (const chunk of stream) {
+			const chunkType = getChunkType(chunk);
+			const convertedChunk = convertChunk[chunkType](chunk, state);
+			appendChunk({convertedChunk, state, getSize, truncateChunk, addChunk, maxBuffer});
+		}
+
+		appendFinalChunk({state, convertChunk, getSize, truncateChunk, addChunk, getFinalChunk, maxBuffer});
+		return finalize(state);
+	} catch (error) {
+		error.bufferedData = finalize(state);
+		throw error;
+	}
+};
+
+const appendFinalChunk = ({state, getSize, truncateChunk, addChunk, getFinalChunk, maxBuffer}) => {
+	const convertedChunk = getFinalChunk(state);
+	if (convertedChunk !== undefined) {
+		appendChunk({convertedChunk, state, getSize, truncateChunk, addChunk, maxBuffer});
+	}
+};
+
+const appendChunk = ({convertedChunk, state, getSize, truncateChunk, addChunk, maxBuffer}) => {
+	const chunkSize = getSize(convertedChunk);
+	const newLength = state.length + chunkSize;
+
+	if (newLength <= maxBuffer) {
+		addNewChunk(convertedChunk, state, addChunk, newLength);
+		return;
+	}
+
+	const truncatedChunk = truncateChunk(convertedChunk, maxBuffer - state.length);
+
+	if (truncatedChunk !== undefined) {
+		addNewChunk(truncatedChunk, state, addChunk, maxBuffer);
+	}
+
+	throw new MaxBufferError();
+};
+
+const addNewChunk = (convertedChunk, state, addChunk, newLength) => {
+	state.contents = addChunk(convertedChunk, state, newLength);
+	state.length = newLength;
+};
+
+const isAsyncIterable = stream => typeof stream === 'object' && stream !== null && typeof stream[Symbol.asyncIterator] === 'function';
+
+const getChunkType = chunk => {
+	const typeOfChunk = typeof chunk;
+
+	if (typeOfChunk === 'string') {
+		return 'string';
+	}
+
+	if (typeOfChunk !== 'object' || chunk === null) {
+		return 'others';
+	}
+
+	// eslint-disable-next-line n/prefer-global/buffer
+	if (globalThis.Buffer?.isBuffer(chunk)) {
+		return 'buffer';
+	}
+
+	const prototypeName = objectToString.call(chunk);
+
+	if (prototypeName === '[object ArrayBuffer]') {
+		return 'arrayBuffer';
+	}
+
+	if (prototypeName === '[object DataView]') {
+		return 'dataView';
+	}
+
+	if (
+		Number.isInteger(chunk.byteLength)
+		&& Number.isInteger(chunk.byteOffset)
+		&& objectToString.call(chunk.buffer) === '[object ArrayBuffer]'
+	) {
+		return 'typedArray';
+	}
+
+	return 'others';
+};
+
+const {toString: objectToString} = Object.prototype;
+
+export class MaxBufferError extends Error {
+	name = 'MaxBufferError';
+
+	constructor() {
+		super('maxBuffer exceeded');
+	}
+}