Building works the same on all platforms:
npm run build
This will lint the sources, test the sources, compile a UMD version, a CJS version, a ES bundle, compile a minified browser version, test everything and generate documentation files.
There must be no errors or warnings during the build.
The dist files are generated in the dist/ folder.
The API documentation is generated in the docs/ folder.
Mind that wavefile uses Google Closure Compiler with compilation level set to ADVANCED, so properties that have not been exported will be renamed (and likely result in errors in the compiled browser version).