Prisma MCP Server

import readline from 'node:readline' import { Readable } from 'node:stream' import { describe, expect, test } from 'vitest' /** * Verify node:readline correctly handles multibyte UTF-8 characters split across chunks. * * This is a regression test for https://github.com/prisma/prisma/issues/27695 * * Note: Integration tests can't reliably reproduce chunk splitting, so these unit tests * directly control chunk boundaries. */ /** * Helper function to collect lines from a readline interface */ async function collectLines(stream: Readable): Promise<string[]> { const rl = readline.createInterface({ input: stream, crlfDelay: Infinity, }) const lines: string[] = [] rl.on('line', (line) => lines.push(line)) return new Promise((resolve) => { rl.on('close', () => resolve(lines)) }) } /** * Helper function to create a readable stream from chunks */ function createStreamFromChunks(chunks: Buffer[]): Readable { let index = 0 return new Readable({ read() { if (index < chunks.length) { this.push(chunks[index]) index++ } else { this.push(null) } }, }) } describe('readline multibyte UTF-8 handling', () => { test('handles single Japanese character (3 bytes) split across chunks', async () => { // 「あ」is UTF-8 encoded as [0xE3, 0x81, 0x82] const chunk1 = Buffer.from([0xe3, 0x81]) // First 2 bytes const chunk2 = Buffer.from([0x82, 0x0a]) // Last byte + newline const stream = createStreamFromChunks([chunk1, chunk2]) const lines = await collectLines(stream) expect(lines).toEqual(['あ']) }) test('handles multiple lines with multibyte characters split across chunks', async () => { // Multiple lines: "日本語\n😀" (no trailing newline) // 日: [0xE6, 0x97, 0xA5] // 本: [0xE6, 0x9C, 0xAC] // 語: [0xE8, 0xAA, 0x9E] // 😀: [0xF0, 0x9F, 0x98, 0x80] const line1 = Buffer.from('日本語\n', 'utf8') const line2 = Buffer.from('😀', 'utf8') // No newline at end const fullBuffer = Buffer.concat([line1, line2]) // Split in the middle of the second line (within the emoji) const splitPoint = line1.length + 2 // Split after first 2 bytes of emoji const chunk1 = fullBuffer.subarray(0, splitPoint) const chunk2 = fullBuffer.subarray(splitPoint) const stream = createStreamFromChunks([chunk1, chunk2]) const lines = await collectLines(stream) expect(lines).toEqual(['日本語', '😀']) }) })