Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Allow passing a WebAssembly.Module in --no-modules #969

Merged
merged 1 commit into from
Oct 16, 2018
Merged

Allow passing a WebAssembly.Module in --no-modules #969

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
47 changes: 26 additions & 21 deletions crates/cli-support/src/js/mod.rs
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -418,27 +418,32 @@ impl<'a> Context<'a> {
let mut js = if self.config.no_modules {
format!(
"\
(function() {{
var wasm;
const __exports = {{}};
{globals}
function init(wasm_path) {{
const fetchPromise = fetch(wasm_path);
let resultPromise;
if (typeof WebAssembly.instantiateStreaming === 'function') {{
resultPromise = WebAssembly.instantiateStreaming(fetchPromise, {{ './{module}': __exports }});
}} else {{
resultPromise = fetchPromise
.then(response => response.arrayBuffer())
.then(buffer => WebAssembly.instantiate(buffer, {{ './{module}': __exports }}));
}}
return resultPromise.then(({{instance}}) => {{
wasm = init.wasm = instance.exports;
return;
}});
}};
self.{global_name} = Object.assign(init, __exports);
}})();",
(function() {{
var wasm;
const __exports = {{}};
{globals}
function init(path_or_module) {{
let instantiation;
const imports = {{ './{module}': __exports }};
if (path_or_module instanceof WebAssembly.Module) {{
instantiation = WebAssembly.instantiate(path_or_module, imports);
}} else {{
const data = fetch(path_or_module);
if (typeof WebAssembly.instantiateStreaming === 'function') {{
instantiation = WebAssembly.instantiateStreaming(data, imports);
}} else {{
instantiation = data
.then(response => response.arrayBuffer())
.then(buffer => WebAssembly.instantiate(buffer, imports));
}}
}}
return instantiation.then(({{instance}}) => {{
wasm = init.wasm = instance.exports;
return;
}});
}};
self.{global_name} = Object.assign(init, __exports);
}})();",
globals = self.globals,
module = module_name,
global_name = self.config.no_modules_global
Expand Down
12 changes: 6 additions & 6 deletions guide/src/reference/no-esm.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -59,14 +59,14 @@ for the wasm-module-to-be. The page is configured with one exported global, in
this case `wasm_bindgen`. The name of this global can be configured with the
`--no-modules-global` option.

The global `wasm_bindgen` is a function that takes one argument, the path to the
wasm file. When invoked `wasm_bindgen` will return a promise for when the wasm
file is ready-to-go. After that all exported functionality on
`wasm_bindgen` will be functional.
The global `wasm_bindgen` is a function that takes one argument: either the path
to the wasm file to fetch or a `WebAssembly.Module`. When invoked `wasm_bindgen`
will return a promise for when the wasm module is ready-to-go. After that all
exported functionality on `wasm_bindgen` will be functional.

In the example above, after calling `wasm_bindgen('./hello_bg.wasm')` we wait
for the wasm module to be compiled, and afterwards we're invoking our `greet`
export.
for the wasm module to be fetched and compiled, and afterwards we're invoking
our `greet` export.

Note that exports are available for binding before the wasm module has been
instantiated, for example this would have also worked:
Expand Down