TransformStream creates a readable/writable pair with processing logic in between. The transform() function executes on write, not on read. Processing of the transform happens eagerly as data arrives, regardless of whether any consumer is ready. This causes unnecessary work when consumers are slow, and the backpressure signaling between the two sides has gaps that can cause unbounded buffering under load. The expectation in the spec is that the producer of the data being transformed is paying attention to the writer.ready signal on the writable side of the transform but quite often producers just simply ignore it.
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The couple are part of a group, Truth for Our Babies, who are campaigning for an independent investigation into maternity services at the University Hospitals Sussex NHS Trust. Earlier this month, BBC News and the New Statesman found that at least 55 babies over a five-year period might have survived with better care.
His book, Lost Moon: The Perilous Voyage of Apollo 13, became the famous 1995 movie, starring Tom Hanks as Jim Lovell.