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When using Bun.spawn(), the child process inherits the stderr of the spawning process. If instead you’d prefer to read and handle stderr, set the stderr option to "pipe". 
const proc = Bun.spawn(['echo', 'hello'], {
	stderr: 'pipe',
});

proc.stderr; // => ReadableStream
To read stderr until the child process exits, use .text() 
const proc = Bun.spawn(['echo', 'hello'], {
	stderr: 'pipe',
});

const errors: string = await proc.stderr.text();
if (errors) {
	// handle errors
}
See Docs > API > Child processes for complete documentation.