Support WASM on Flutter web

[Rexios80]

I tried to migrate this package to package:web but I ran into the following issue:

IsarError: DbError (10): disk I/O error
main.dart.mjs:56 at Error._throwWithCurrentStackTrace (http://localhost:59602/main.dart.wasm:wasm-function[915]:0xe32a7)
main.dart.mjs:56     at _extension#14|throwError (http://localhost:59602/main.dart.wasm:wasm-function[11616]:0x1b89b0)
main.dart.mjs:56     at _extension#14|checkNoError (http://localhost:59602/main.dart.wasm:wasm-function[11604]:0x1b8727)
main.dart.mjs:56     at new _IsarImpl.open (http://localhost:59602/main.dart.wasm:wasm-function[14711]:0x1f34a9)
main.dart.mjs:56     at Isar.open (http://localhost:59602/main.dart.wasm:wasm-function[14709]:0x1f32c9)
main.dart.mjs:56     at _CounterAppState.initState (http://localhost:59602/main.dart.wasm:wasm-function[5834]:0x139aa5)
main.dart.mjs:56     at StatefulElement._firstBuild (http://localhost:59602/main.dart.wasm:wasm-function[5833]:0x139a58)
main.dart.mjs:56     at ComponentElement.mount (http://localhost:59602/main.dart.wasm:wasm-function[5820]:0x13979d)
main.dart.mjs:56 Another exception was thrown: Instance of 'DiagnosticsProperty<void>'

This only happens when running with WASM enabled. It must be something to do with FFI, but looking into that is beyond my abilities. Any help with this would be appreciated. I tried to regenerate the FFI bindings but that failed as well probably due to environment config issues.

[nomad2569]

I tried building WASM with your branch, but I encountered the following error message. Is there any ideas?

Target dart2wasm failed: ProcessException: Process exited abnormally with exit code 64:
*NOTE*: Compilation to WasmGC is experimental.
The support may change, or be removed, with no advance notice.


Unhandled exception:
Constant InstanceConstant(const _FfiAbiSpecificMapping{_FfiAbiSpecificMapping.nativeTypes: const <Type?>[Int32, Int64, Int32, Int64, Int64, Int64, Int64,
Int64, Int32, Int64, Int64, Int32, Int64, Int32, Int64, Int32, Int64, Int64, Int64, Int64, Int32, Int64]}) references field
_FfiAbiSpecificMapping.nativeTypes which is not retained
#0      _TreeShakerConstantVisitor.visitInstanceConstant.<anonymous closure> (package:vm/transformations/type_flow/transformer.dart:2257)
#1      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633)
#2      _TreeShakerConstantVisitor.visitInstanceConstant (package:vm/transformations/type_flow/transformer.dart:2255)
#3      InstanceConstant.accept (package:kernel/ast.dart:14144)
#4      _TreeShakerConstantVisitor.analyzeConstant (package:vm/transformations/type_flow/transformer.dart:2190)
#5      _TreeShakerConstantVisitor.visitInstanceConstant.<anonymous closure> (package:vm/transformations/type_flow/transformer.dart:2260)
#6      _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:633)
#7      _TreeShakerConstantVisitor.visitInstanceConstant (package:vm/transformations/type_flow/transformer.dart:2255)
#8      InstanceConstant.accept (package:kernel/ast.dart:14144)
#9      _TreeShakerConstantVisitor.analyzeConstant (package:vm/transformations/type_flow/transformer.dart:2190)
#10     _TreeShakerPass1.visitConstant (package:vm/transformations/type_flow/transformer.dart:1558)
#11     ConstantExpression.transformOrRemoveChildren (package:kernel/ast.dart:8723)
#12     RemovingTransformer.defaultTreeNode (package:kernel/visitor.dart:2164)
#13     TreeVisitor1Default.defaultMember (package:kernel/visitor.dart:747)
#14     ExpressionVisitor1DefaultMixin.visitConstantExpression (package:kernel/visitor.dart:2368)
#15     ConstantExpression.accept1 (package:kernel/ast.dart:8707)
#16     RemovingTransformer.transformOrRemove (package:kernel/visitor.dart:1917)
#17     RemovingTransformer.transformList (package:kernel/visitor.dart:2141)
#18     RemovingTransformer.transformExpressionList (package:kernel/visitor.dart:2067)
#19     TreeShaker.addClassUsedInType (package:vm/transformations/type_flow/transformer.dart:878)
#20     _TreeShakerTypeVisitor.visitInterfaceType (package:vm/transformations/type_flow/transformer.dart:1098)
#21     InterfaceType.accept (package:kernel/ast.dart:11536)
#22     visitList (package:kernel/ast.dart:14913)
#23     FunctionType.visitChildren (package:kernel/ast.dart:11646)
#24     RecursiveVisitor.defaultNode (package:kernel/visitor.dart:1725)
#25     VisitorDefault.defaultDartType (package:kernel/visitor.dart:1524)
#26     DartTypeVisitorDefaultMixin.visitFutureOrType (package:kernel/visitor.dart:789)
#27     FunctionType.accept (package:kernel/ast.dart:11637)
#28     visitList (package:kernel/ast.dart:14913)
#29     InterfaceType.visitChildren (package:kernel/ast.dart:11545)
#30     _TreeShakerTypeVisitor.visitInterfaceType (package:vm/transformations/type_flow/transformer.dart:1099)
#31     InterfaceType.accept (package:kernel/ast.dart:11536)
#32     visitList (package:kernel/ast.dart:14913)
#33     InterfaceType.visitChildren (package:kernel/ast.dart:11545)
#34     _TreeShakerTypeVisitor.visitInterfaceType (package:vm/transformations/type_flow/transformer.dart:1099)
#35     InterfaceType.accept (package:kernel/ast.dart:11536)
#36     _TreeShakerPass1.visitDartType (package:vm/transformations/type_flow/transformer.dart:1247)
#37     VariableDeclaration.transformOrRemoveChildren (package:kernel/ast.dart:10817)
#38     RemovingTransformer.defaultTreeNode (package:kernel/visitor.dart:2164)
#39     TreeVisitor1Default.defaultMember (package:kernel/visitor.dart:747)
#40     StatementVisitor1DefaultMixin.visitVariableDeclaration (package:kernel/visitor.dart:2597)
#41     VariableDeclaration.accept1 (package:kernel/ast.dart:10795)
#42     RemovingTransformer.transformOrRemove (package:kernel/visitor.dart:1917)
#43     RemovingTransformer.transformList (package:kernel/visitor.dart:2141)
#44     RemovingTransformer.transformStatementList (package:kernel/visitor.dart:2095)
#45     AssertBlock.transformOrRemoveChildren (package:kernel/ast.dart:9311)
#46     RemovingTransformer.defaultTreeNode (package:kernel/visitor.dart:2164)
#47     TreeVisitor1Default.defaultMember (package:kernel/visitor.dart:747)
#48     StatementVisitor1DefaultMixin.visitBlock (package:kernel/visitor.dart:2546)
#49     Block.accept1 (package:kernel/ast.dart:9250)
#50     RemovingTransformer.transform (package:kernel/visitor.dart:1881)
#51     BlockExpression.transformOrRemoveChildren (package:kernel/ast.dart:8853)
#52     RemovingTransformer.defaultTreeNode (package:kernel/visitor.dart:2164)
#53     TreeVisitor1Default.defaultMember (package:kernel/visitor.dart:747)
#54     ExpressionVisitor1DefaultMixin.visitBlockExpression (package:kernel/visitor.dart:2402)
#55     BlockExpression.accept1 (package:kernel/ast.dart:8835)
#56     RemovingTransformer.transformOrRemove (package:kernel/visitor.dart:1917)
#57     RemovingTransformer.transformOrRemoveExpression (package:kernel/visitor.dart:1890)
#58     Field.transformOrRemoveChildren (package:kernel/ast.dart:2559)
#59     _TreeShakerPass1.visitField (package:vm/transformations/type_flow/transformer.dart:1319)
#60     Field.accept1 (package:kernel/ast.dart:2530)
#61     RemovingTransformer.transformOrRemove (package:kernel/visitor.dart:1917)
#62     RemovingTransformer.transformList (package:kernel/visitor.dart:2141)
#63     RemovingTransformer.transformFieldList (package:kernel/visitor.dart:2041)
#64     Library.transformOrRemoveChildren (package:kernel/ast.dart:626)
#65     RemovingTransformer.defaultTreeNode (package:kernel/visitor.dart:2164)
#66     TreeVisitor1DefaultMixin.visitLibrary (package:kernel/visitor.dart:680)
#67     Library.accept1 (package:kernel/ast.dart:588)
#68     RemovingTransformer.transformOrRemove (package:kernel/visitor.dart:1917)
#69     RemovingTransformer.transformList (package:kernel/visitor.dart:2141)
#70     RemovingTransformer.transformLibraryList (package:kernel/visitor.dart:1960)
#71     Component.transformOrRemoveChildren (package:kernel/ast.dart:14779)
#72     _TreeShakerPass1.transformComponent (package:vm/transformations/type_flow/transformer.dart:1156)
#73     TreeShaker.transformComponent (package:vm/transformations/type_flow/transformer.dart:831)
#74     transformComponent (package:vm/transformations/type_flow/transformer.dart:134)
#75     compileToModule (package:dart2wasm/compile.dart:156)
<asynchronous suspension>
#76     generateWasm (package:dart2wasm/generate_wasm.dart:24)
<asynchronous suspension>
#77     main (file:///Volumes/Work/s/w/ir/x/w/sdk/pkg/dart2wasm/bin/dart2wasm.dart:10)
<asynchronous suspension>

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