Globals

The globals section is where we can import and export values in and out of WebAssembly modules. In a WebAssembly module, you can import either mutable or immutable values from JavaScript. Additionally, WebAssembly also supports wasmValue, an internal immutable value inside the WebAssembly module itself.

Let's create a file called globals.wat and add the following contents to it:

$ touch globals.wat
(module
     (global $mutableValue (import "js" "mutableGlobal")
       (mut i32))
     (global $immutableValue (import "js"
       "immutableGlobal") i32)
     (global $wasmValue i32 (i32.const 10))
     (func (export "getWasmValue") (result i32)
        (global.get $wasmValue))
     (func...