fix(fetch): use structuredClone in clone body steps #1697
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Codecov ReportBase: 94.09% // Head: 94.08% // Decreases project coverage by
Additional details and impacted files@@ Coverage Diff @@
## main #1697 +/- ##
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- Coverage 94.09% 94.08% -0.01%
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Files 53 53
Lines 4912 4923 +11
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+ Hits 4622 4632 +10
- Misses 290 291 +1
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ronag
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`5.11.0` includes nodejs/undici#1643. There are some non-trivial changes required to upgrade to `5.14.0`: - Since `undici@5.12.0` (nodejs/undici#1697), `structuredClone` is used on bodies, which may be byte streams. Due to a Node bug (nodejs/node#45955), readable byte streams cannot be transferred, breaking `fetch`. - Since `undici@5.14.0` (nodejs/undici#1793), global `ReadableStream` and `TransformStream` are used if available. In the Vitest environment, (which modifies the global scope unlike Jest which runs tests in a VM context), if the `streams_enable_constructors` compatibility flag isn't enabled, `fetch` breaks as `ReadableStream`s can't be constructed.
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Refs: #1666 (comment)
Enables the following WPTs (only Safari currently passes these tests, and the same 2 tests fail here):
https://wpt.fyi/results/fetch/api/response/response-clone.any.html?label=master&label=experimental&aligned&view=subtest
The spec does tell implementations to clone the stream, but you have to go down a few layers:
Let « out1, out2 » be the result of teeing body’s stream.
To tee a ReadableStream stream, return ? ReadableStreamTee(stream, true).
ReadableStreamTee(stream, cloneForBranch2) will tee a given readable stream.
The second argument, cloneForBranch2, governs whether or not the data from the original stream will be cloned (using HTML’s serializable objects framework) before appearing in the second of the returned branches.