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Merged
chenjiahan merged 3 commits into from
Jan 16, 2026
Merged

feat!: enable asyncWebAssembly by default #12764

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cb3b646
feat: enable asyncWebAssembly by default
LingyuCoder Jan 16, 2026
0d81017
fix
LingyuCoder Jan 16, 2026
a8ef55b
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chenjiahan Jan 16, 2026
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2 changes: 1 addition & 1 deletion crates/rspack/src/builder/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -3728,7 +3728,7 @@ impl ExperimentsBuilder {
// Builder specific
let future_defaults = w!(self.future_defaults, false);
w!(self.css, *future_defaults);
w!(self.async_web_assembly, *future_defaults);
w!(self.async_web_assembly, true);
w!(self.output_module, false);

Ok(Experiments {
Expand Down
1 change: 1 addition & 0 deletions crates/rspack/tests/snapshots/defaults__default_options-2.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ expression: builder_context
---
BuilderContext {
plugins: [
AsyncWebAssemblyModulesPlugin,
ArrayPushCallbackChunkFormatPlugin,
EnableChunkLoadingPlugin(
Jsonp,
Expand Down
213 changes: 213 additions & 0 deletions crates/rspack/tests/snapshots/defaults__default_options.snap
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Original file line number Diff line number Diff line change
Expand Up @@ -1190,6 +1190,219 @@ CompilerOptions {
},
extract_source_map: None,
},
ModuleRule {
rspack_resource: None,
test: Some(
"Func(...)",
),
include: None,
exclude: None,
resource: None,
resource_query: None,
resource_fragment: None,
dependency: None,
issuer: None,
issuer_layer: None,
scheme: None,
mimetype: None,
description_data: None,
with: None,
one_of: None,
rules: Some(
[
ModuleRule {
rspack_resource: None,
test: None,
include: None,
exclude: None,
resource: None,
resource_query: None,
resource_fragment: None,
dependency: None,
issuer: None,
issuer_layer: None,
scheme: None,
mimetype: None,
description_data: Some(
{
"type": RuleSetConditionWithEmpty {
condition: "module",
match_when_empty: OnceCell {
value: None,
},
},
},
),
with: None,
one_of: None,
rules: None,
effect: ModuleRuleEffect {
side_effects: None,
type: None,
layer: None,
use: ,
parser: None,
generator: None,
resolve: Some(
Resolve {
extensions: None,
alias: None,
prefer_relative: None,
prefer_absolute: None,
symlinks: None,
main_files: None,
main_fields: None,
condition_names: None,
tsconfig: None,
modules: None,
fallback: None,
fully_specified: Some(
true,
),
exports_fields: None,
extension_alias: None,
alias_fields: None,
roots: None,
restrictions: None,
imports_fields: None,
by_dependency: None,
description_files: None,
enforce_extension: None,
pnp: None,
builtin_modules: false,
},
),
enforce: Normal,
extract_source_map: None,
},
extract_source_map: None,
},
],
),
effect: ModuleRuleEffect {
side_effects: None,
type: Some(
WasmAsync,
),
layer: None,
use: ,
parser: None,
generator: None,
resolve: None,
enforce: Normal,
extract_source_map: None,
},
extract_source_map: None,
},
ModuleRule {
rspack_resource: None,
test: None,
include: None,
exclude: None,
resource: None,
resource_query: None,
resource_fragment: None,
dependency: None,
issuer: None,
issuer_layer: None,
scheme: None,
mimetype: Some(
RuleSetConditionWithEmpty {
condition: "application/wasm",
match_when_empty: OnceCell {
value: None,
},
},
),
description_data: None,
with: None,
one_of: None,
rules: Some(
[
ModuleRule {
rspack_resource: None,
test: None,
include: None,
exclude: None,
resource: None,
resource_query: None,
resource_fragment: None,
dependency: None,
issuer: None,
issuer_layer: None,
scheme: None,
mimetype: None,
description_data: Some(
{
"type": RuleSetConditionWithEmpty {
condition: "module",
match_when_empty: OnceCell {
value: None,
},
},
},
),
with: None,
one_of: None,
rules: None,
effect: ModuleRuleEffect {
side_effects: None,
type: None,
layer: None,
use: ,
parser: None,
generator: None,
resolve: Some(
Resolve {
extensions: None,
alias: None,
prefer_relative: None,
prefer_absolute: None,
symlinks: None,
main_files: None,
main_fields: None,
condition_names: None,
tsconfig: None,
modules: None,
fallback: None,
fully_specified: Some(
true,
),
exports_fields: None,
extension_alias: None,
alias_fields: None,
roots: None,
restrictions: None,
imports_fields: None,
by_dependency: None,
description_files: None,
enforce_extension: None,
pnp: None,
builtin_modules: false,
},
),
enforce: Normal,
extract_source_map: None,
},
extract_source_map: None,
},
],
),
effect: ModuleRuleEffect {
side_effects: None,
type: Some(
WasmAsync,
),
layer: None,
use: ,
parser: None,
generator: None,
resolve: None,
enforce: Normal,
extract_source_map: None,
},
extract_source_map: None,
},
ModuleRule {
rspack_resource: None,
test: None,
Expand Down
3 changes: 2 additions & 1 deletion packages/rspack/src/config/defaults.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -210,7 +210,8 @@ const applyInfrastructureLoggingDefaults = (

const applyExperimentsDefaults = (experiments: ExperimentsNormalized) => {
D(experiments, 'futureDefaults', false);
D(experiments, 'asyncWebAssembly', experiments.futureDefaults);
// IGNORE(experiments.asyncWebAssembly): Rspack enable async WebAssembly by default
D(experiments, 'asyncWebAssembly', true);
D(experiments, 'css', experiments.futureDefaults ? true : undefined);
D(experiments, 'deferImport', false);

Expand Down
2 changes: 1 addition & 1 deletion packages/rspack/src/config/types.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -2741,7 +2741,7 @@ export type Experiments = {
/**
* Enable async WebAssembly.
* Support the new WebAssembly according to the [updated specification](https://github.com/WebAssembly/esm-integration), it makes a WebAssembly module an async module.
* @default false
* @default true
*/
asyncWebAssembly?: boolean;
/**
Expand Down
6 changes: 5 additions & 1 deletion tests/rspack-test/configCases/wasm/missing-wasm-experiment/rspack.config.js
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Original file line number Diff line number Diff line change
@@ -1,2 +1,6 @@
/** @type {import("@rspack/core").Configuration} */
module.exports = {};
module.exports = {
experiments: {
asyncWebAssembly: false,
},
};
30 changes: 29 additions & 1 deletion tests/rspack-test/defaultsCases/default/base.js
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Original file line number Diff line number Diff line change
Expand Up @@ -20,7 +20,7 @@ module.exports = {
},
},
experiments: Object {
asyncWebAssembly: false,
asyncWebAssembly: true,
buildHttp: undefined,
css: undefined,
deferImport: false,
Expand Down Expand Up @@ -147,6 +147,34 @@ module.exports = {
},
type: javascript/esm,
},
Object {
rules: Array [
Object {
descriptionData: Object {
type: module,
},
resolve: Object {
fullySpecified: true,
},
},
],
test: /\\\\\\.wasm\\$/i,
type: webassembly/async,
},
Object {
mimetype: application/wasm,
rules: Array [
Object {
descriptionData: Object {
type: module,
},
resolve: Object {
fullySpecified: true,
},
},
],
type: webassembly/async,
},
Object {
dependency: url,
oneOf: Array [
Expand Down
38 changes: 1 addition & 37 deletions tests/rspack-test/defaultsCases/experiments/async-wasm.js
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Original file line number Diff line number Diff line change
Expand Up @@ -3,41 +3,5 @@ module.exports = {
description: "async wasm",
options: () => ({ experiments: { asyncWebAssembly: true } }),
diff: e =>
e.toMatchInlineSnapshot(`
- Expected
+ Received

@@ ... @@
- "asyncWebAssembly": false,
+ "asyncWebAssembly": true,
@@ ... @@
+ },
+ Object {
+ "rules": Array [
+ Object {
+ "descriptionData": Object {
+ "type": "module",
+ },
+ "resolve": Object {
+ "fullySpecified": true,
+ },
+ },
+ ],
+ "test": /\\.wasm$/i,
+ "type": "webassembly/async",
+ },
+ Object {
+ "mimetype": "application/wasm",
+ "rules": Array [
+ Object {
+ "descriptionData": Object {
+ "type": "module",
+ },
+ "resolve": Object {
+ "fullySpecified": true,
+ },
+ },
+ ],
+ "type": "webassembly/async",
`)
e.toMatchInlineSnapshot(`Compared values have no visual difference.`)
};
42 changes: 5 additions & 37 deletions tests/rspack-test/defaultsCases/experiments/both-wasm.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,42 +6,10 @@ module.exports = {
}),
diff: e =>
e.toMatchInlineSnapshot(`
- Expected
+ Received
- Expected
+ Received

@@ ... @@
- "asyncWebAssembly": false,
+ "asyncWebAssembly": true,
@@ ... @@
+ "syncWebAssembly": true,
@@ ... @@
+ },
+ Object {
+ "rules": Array [
+ Object {
+ "descriptionData": Object {
+ "type": "module",
+ },
+ "resolve": Object {
+ "fullySpecified": true,
+ },
+ },
+ ],
+ "test": /\\.wasm$/i,
+ "type": "webassembly/async",
+ },
+ Object {
+ "mimetype": "application/wasm",
+ "rules": Array [
+ Object {
+ "descriptionData": Object {
+ "type": "module",
+ },
+ "resolve": Object {
+ "fullySpecified": true,
+ },
+ },
+ ],
+ "type": "webassembly/async",
`)
@@ ... @@
+ "syncWebAssembly": true,
`)
};
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