I'm trying to compile my project in such a way that I can pass a javascript typed array into an exported wasm function.

From every tutorial I read online in order to do this I have to copy the buffer of the typed array into the wasm heap like this:

var buf = Module._malloc(desiredLength);
Module.HEAPU8.set(typedArray, buf);
Module.ccall('my_function', 'number', ['number'], [buf]);

However when I try to run this code in the browser I get this error:

Module._malloc is not a function

This is what I am using to compile my c++ code:

emcc myProject.cpp -s WASM=1 -s EXPORTED_FUNCTIONS="['_processData']" -s "EXTRA_EXPORTED_RUNTIME_METHODS=['ccall', 'cwrap']" -O3 -o index.js

Is there any reason for this error? Did I set something up incorrectly? Any help would be much appreciated.