31   const branch1 = branch[0];  constant
33   const reader1 = branch1.getReader();
66   const branch1 = branch[0];  constant
68   const reader1 = branch1.getReader();
124   const branch1 = branches[0];  constant
126   branch1.cancel();
129     readableStreamToArray(branch1).then(chunks => {
150   const branch1 = branches[0];  constant
155     readableStreamToArray(branch1).then(chunks => {
173   const [branch1, branch2] = stream.tee();
186     const reader1 = branch1.getReader();
296   const [branch1, branch2] = rs.tee();
298   const cancel1 = branch1.cancel();
315   const [branch1, branch2] = rs.tee();
317   const cancel1 = branch1.cancel();