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Improve instantiateStreaming fallback #1723

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merged 1 commit into from
Aug 15, 2019
Merged

Improve instantiateStreaming fallback #1723

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18 changes: 12 additions & 6 deletions crates/cli-support/src/js/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -536,13 +536,19 @@ impl<'a> Context<'a> {
if (typeof WebAssembly.instantiateStreaming === 'function') {{
result = WebAssembly.instantiateStreaming(response, imports)
.catch(e => {{
console.warn(\"`WebAssembly.instantiateStreaming` failed. Assuming this is \
because your server does not serve wasm with \
`application/wasm` MIME type. Falling back to \
`WebAssembly.instantiate` which is slower. Original \
error:\\n\", e);
return response
.then(r => r.arrayBuffer())
.then(r => {{
if (r.headers.get('Content-Type') != 'application/wasm') {{
console.warn(\"`WebAssembly.instantiateStreaming` failed \
because your server does not serve wasm with \
`application/wasm` MIME type. Falling back to \
`WebAssembly.instantiate` which is slower. Original \
error:\\n\", e);
return r.arrayBuffer();
}} else {{
throw e;
}}
}})
.then(bytes => WebAssembly.instantiate(bytes, imports));
}});
}} else {{
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