This glue code is responsible for re-encoding WebAssembly data into JavaScript data and vice versa. For example, when returning a string from JavaScript to WebAssembly, the glue code may need to call a malloc function in the WebAssembly module and re-encode the string at the resulting address, after which the module is responsible for eventually calling free.
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When a host runtime provides a byte-oriented ReadableStream from the runtime itself, for instance, as the body of a fetch Response, it is often far easier for the runtime itself to provide an optimized implementation of BYOB reads, but those still need to be capable of handling both default and BYOB reading patterns and that requirement brings with it a fair amount of complexity.
Here are common examples you'll run into across the difficulty levels: