Function buildBody

cli/src/http/body.ts:42–63

(input: BuildBodyInput)

// json wins over body when both are provided; tests assert single-source-of-truth via type system,
// but at runtime we still prefer json explicitly.
export function buildBody(input: BuildBodyInput): BuildBodyResult {
  const { json, body, method } = input
  const isPayloadMethod = method !== 'GET' && method !== 'HEAD'

  if (json !== undefined) {
    if (!isPayloadMethod)
      return { body: undefined, contentType: undefined }
    if (isJSONSerializable(json))
      return { body: JSON.stringify(json), contentType: 'application/json' }
    return { body: json as BodyInit, contentType: undefined }
  }

  // A raw `body` is passed through untouched. This is replay-safe only for buffered
  // payloads (string, Blob, FormData, typed arrays) — a single-shot ReadableStream
  // would be consumed on the first attempt and replay empty on retry. Safe today
  // because the only stream/multipart caller (file-upload) uses POST, which is not
  // in RETRY_METHODS; revisit if a ReadableStream body is ever sent over GET/PUT/DELETE.
  if (body !== undefined && isPayloadMethod)
    return { body, contentType: undefined }

  return { body: undefined, contentType: undefined }
}