Add a flag to remove producers section

[alexcrichton]

This should help handle instances like the recent Webpack bug and is
also a useful flag in its own right. For now it's set to false, but if
the Webpack bug persists through to tomorrow we likely want to publish a
version of wasm-bindgen with it default set to true.

[xtuc]

Thanks for the quick fix! And sorry for the delay.

I think that you can go ahead and merge it, I believe the Webpack folks are busy at a conf.

[fitzgen]

Looks like we are still hitting the bug?

https://travis-ci.com/rustwasm/wasm-bindgen/jobs/177863766#L873-L889

Error: Unexpected section: 0xfe
    at new CompileError (/home/travis/build/rustwasm/wasm-bindgen/node_modules/@webassemblyjs/helper-api-error/lib/index.js:40:109)
    at parseSection (/home/travis/build/rustwasm/wasm-bindgen/node_modules/@webassemblyjs/wasm-parser/lib/decoder.js:1542:11)
    at Object.decode (/home/travis/build/rustwasm/wasm-bindgen/node_modules/@webassemblyjs/wasm-parser/lib/decoder.js:1559:25)
    at decode (/home/travis/build/rustwasm/wasm-bindgen/node_modules/@webassemblyjs/wasm-parser/lib/index.js:240:21)
    at WebAssemblyParser.parse (/home/travis/build/rustwasm/wasm-bindgen/node_modules/webpack/lib/wasm/WebAssemblyParser.js:74:19)
    at doBuild.err (/home/travis/build/rustwasm/wasm-bindgen/node_modules/webpack/lib/NormalModule.js:460:32)
    at runLoaders (/home/travis/build/rustwasm/wasm-bindgen/node_modules/webpack/lib/NormalModule.js:342:12)
    at /home/travis/build/rustwasm/wasm-bindgen/node_modules/loader-runner/lib/LoaderRunner.js:373:3
    at iterateNormalLoaders (/home/travis/build/rustwasm/wasm-bindgen/node_modules/loader-runner/lib/LoaderRunner.js:214:10)
    at Array.<anonymous> (/home/travis/build/rustwasm/wasm-bindgen/node_modules/loader-runner/lib/LoaderRunner.js:205:4)
    at Storage.finished (/home/travis/build/rustwasm/wasm-bindgen/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:43:16)
    at provider (/home/travis/build/rustwasm/wasm-bindgen/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:79:9)
    at /home/travis/build/rustwasm/wasm-bindgen/node_modules/graceful-fs/graceful-fs.js:90:16
    at FSReqWrap.readFileAfterClose [as oncomplete] (internal/fs/read_file_context.js:53:3)
 @ ./pkg/add.js 2:0-33 10:11-19
 @ ./index.js

[fitzgen]

Ah, looks like CI wasn't updated to use this flag for the examples. Want to do that to verify the work around?

[alexcrichton]

Oh FWIW this isn't switching the defaults it's just adding an option. I figured we'd give Webpack a bit to release a new version as it just got fixed today. If it persists though I figured we'd temporarily change the defaults.