I am just trying to add wasmJs to one of my multi-...

# webassembly

[Michael Paus]

I am just trying to add wasmJs to one of my multi-platform libraries but that breaks my tests because some tests read some reference values from a large binary file via kotlinx-io. But file IO does not seem to be supported for wasmJs which is somehow understandable because the browser does not have a concept of a file system but what other possibility do you have to get this test data into your tests?

[Igor Yakovlev]

Hi, the kotlinx-io does support wasmJs target, as far as I know just like kotlin-js do. As far as i remember it use nodejs API for that.

[Michael Paus]

But when I run my test on wasmJs I only get a:

UnsupportedOperationException: Module os could not be loaded
UnsupportedOperationException: Module os could not be loaded
	at kotlin.captureStackTrace(/var/folders/0q/r4k4hbd13_s0p0thlz2hs8b80000gn/T/_karma_webpack_930887/commons.js:133)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlin.captureStackTrace__externalAdapter(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlin.Throwable.<init>(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlin.Throwable.<init>(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlin.Exception.<init>(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlin.RuntimeException.<init>(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlin.UnsupportedOperationException.<init>(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at <de.mpmediasoft.mpcore.gis:gis_test>.kotlinx.io.node.loadModule(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at lambda.invoke(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)
	at lambda.invoke(<http://localhost:9876/ktlibs-gis-wasm-js-test.wasm>)

On all other targets (Android, JVM, iOS) this test it running nicely.

Other tests, which don’t try to do any IO, are working on wasmJs too.