Error: Unexpected section: 0xfe

[topheman]

Hello,

I am using the wasm-bindgen crate in this project, which is really likely to your example project.

I've got wasm-pack@0.8.1 installed and wasm-tool/wasm-pack-plugin@0.4.2

If I upgrade wasm-bindgen to v0.2.35 and above, I get the following error in webpack :

ERROR in ./crate/pkg/ball_wasm_bg.wasm
Module parse failed: Unexpected section: 0xfe
You may need an appropriate loader to handle this file type.
Error: Unexpected section: 0xfe
    at new CompileError (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/@webassemblyjs/helper-api-error/lib/index.js:40:109)
    at parseSection (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/@webassemblyjs/wasm-parser/lib/decoder.js:1542:11)
    at Object.decode (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/@webassemblyjs/wasm-parser/lib/decoder.js:1559:25)
    at decode (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/@webassemblyjs/wasm-parser/lib/index.js:240:21)
    at WebAssemblyParser.parse (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/webpack/lib/wasm/WebAssemblyParser.js:74:19)
    at doBuild.err (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/webpack/lib/NormalModule.js:460:32)
    at runLoaders (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/webpack/lib/NormalModule.js:342:12)
    at /Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/loader-runner/lib/LoaderRunner.js:370:3
    at iterateNormalLoaders (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/loader-runner/lib/LoaderRunner.js:211:10)
    at Array.<anonymous> (/Users/Tophe/projects/rust/rust-wasm-experiments/node_modules/loader-runner/lib/LoaderRunner.js:202:4)
 @ ./crate/pkg/ball_wasm.js 2:0-39 42:71-82 43:45-56 55:34-69 62:73-84 63:47-58 77:15-37 96:8-31 102:8-28 213:16-38 303:4-24 322:15-36 329:15-36 338:15-36 345:15-36 354:15-41 361:15-41 385:19-32 394:15-29 407:15-51 418:16-44 429:15-45 442:15-58 451:15-31 457:4-34 473:19-42 490:15-39 511:15-39 520:15-38 533:15-41 549:19-48 568:12-42 574:12-32 595:15-68 605:8-34 611:8-28
 @ ./js/index.js

ERROR in chunk 0
258426ffd4ef125a122b.module.wasm
/Users/Tophe/projects/rust/rust-wasm-experiments/crate/pkg/ball_wasm_bg.wasm
unexpected end

According to their changelog, this is when wasm-bindgen adopted the walrus crate to perform its transformations of the wasm that rustc/LLVM emits - see rustwasm/wasm-bindgen#1237

For the moment, I can make it work by using wasm-bindgen@0.2.34

I checked, you don't have the same error in your examples, do you have any insights about this ?

Tophe

[fitzgen]

Can you make sure that your webpack and dependencies are all on their latest versions? I believe this should be fixed in newer releases.

[topheman]

Thanks @fitzgen it now works with the latest webpack version.