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Merge pull request #1723 from alexcrichton/instntiate-streaming

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Improve instantiateStreaming fallback
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Alex Crichton 2019-08-15 11:55:51 -05:00 committed by GitHub
commit bd7c90788a
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 6 deletions
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18
crates/cli-support/src/js/mod.rs
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@ -536,13 +536,19 @@ impl<'a> Context<'a> {
if (typeof WebAssembly.instantiateStreaming === 'function') {{ if (typeof WebAssembly.instantiateStreaming === 'function') {{
result = WebAssembly.instantiateStreaming(response, imports) result = WebAssembly.instantiateStreaming(response, imports)
.catch(e => {{ .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 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)); .then(bytes => WebAssembly.instantiate(bytes, imports));
}}); }});
}} else {{ }} else {{