Function safeBodyText

packages/core/sdk/src/oauth-helpers.ts:552–558

(read: () => Promise<string>)

 *  not expect. The read is passed as a thunk so that `.clone()` throwing on an
 *  already-consumed body is caught here too, rather than escaping as a defect. */
const safeBodyText = async (read: () => Promise<string>): Promise<string | null> =>
  Promise.resolve()
    .then(read)
    .then(
      (value) => value,
      () => null,
    );

/** Structurally probe an untrusted upstream body. Returns `undefined` rather
 *  than a fabricated value when it is not JSON; the caller's schema decode