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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
export async function readStdin(): Promise<string> {
const MAX_STDIN_SIZE = 8 * 1024 * 1024; // 8MB
return new Promise((resolve, reject) => {
let data = '';
let totalSize = 0;
process.stdin.setEncoding('utf8');
const onReadable = () => {
let chunk;
while ((chunk = process.stdin.read()) !== null) {
if (totalSize + chunk.length > MAX_STDIN_SIZE) {
const remainingSize = MAX_STDIN_SIZE - totalSize;
data += chunk.slice(0, remainingSize);
console.warn(
`Warning: stdin input truncated to ${MAX_STDIN_SIZE} bytes.`,
);
process.stdin.destroy(); // Stop reading further
break;
}
data += chunk;
totalSize += chunk.length;
}
};
const onEnd = () => {
cleanup();
resolve(data);
};
const onError = (err: Error) => {
cleanup();
reject(err);
};
const cleanup = () => {
process.stdin.removeListener('readable', onReadable);
process.stdin.removeListener('end', onEnd);
process.stdin.removeListener('error', onError);
};
process.stdin.on('readable', onReadable);
process.stdin.on('end', onEnd);
process.stdin.on('error', onError);
});
}
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