feat(wasm-dpp): implement function to produce generics from JsValue

packages/wasm-dpp/README.md

@@ -14,7 +14,8 @@ The WASM JavaScript binding of the Rust implementation of the [Dash Platform Pro
 In order for this binding to work, you have to have a rs-platform cloned
 alongside platform repo, so you can have access to the rust dpp.
 
-## IMPORTANT! Build on a Mac
+## IMPORTANT! 
+### Build on a Mac
 
 To build on a mac, you need to perform two steps. First, install `clang`
 from the homebrew. XCode's `clang` doesn't ship with the WASM support. Second,
@@ -24,6 +25,9 @@ instead.
 
 Alternatively, you can add the following to the `yarn workspace @dashevo/wasm-dpp build:node:mac` instead.
 
+### Class names minification
+Library consumers must ignore class names minification for `@dashevo/wasm-dpp` library in their bundlers.  
+
 ## Table of Contents
 
 - [Install](#install)

packages/wasm-dpp/package.json

@@ -74,6 +74,7 @@
     "stream-browserify": "^3.0.0",
     "stream-http": "^3.2.0",
     "string_decoder": "^1.3.0",
+    "terser-webpack-plugin": "^5.3.1",
     "ts-loader": "^8.0.2",
     "typescript": "^3.9.5",
     "url": "^0.11.0",

packages/wasm-dpp/src/utils.rs

@@ -6,6 +6,7 @@ use dpp::{
 use js_sys::Function;
 use serde::de::DeserializeOwned;
 use serde_json::Value;
+use wasm_bindgen::convert::RefFromWasmAbi;
 use wasm_bindgen::prelude::*;
 
 use crate::errors::{from_dpp_err, RustConversionError};
@@ -121,3 +122,33 @@ impl<T> WithJsError<T> for Result<T, serde_json::Error> {
         }
     }
 }
+
+pub fn generic_of_js_val<T: RefFromWasmAbi<Abi = u32>>(
+    js_value: &JsValue,
+    class_name: &str,
+) -> Result<T::Anchor, JsValue> {
+    if !js_value.is_object() {
+        return Err(JsValue::from_str(
+            format!("Value supplied as {} is not an object", class_name).as_str(),
+        ));
+    }
+
+    let ctor_name = js_sys::Object::get_prototype_of(js_value)
+        .constructor()
+        .name();
+
+    if ctor_name == class_name {
+        let ptr = js_sys::Reflect::get(js_value, &JsValue::from_str("ptr"))?;
+        let ptr_u32: u32 = ptr
+            .as_f64()
+            .ok_or(JsValue::from("Invalid JS object pointer"))? as u32;
+        let reference = unsafe { T::ref_from_abi(ptr_u32) };
+        Ok(reference)
+    } else {
+        let error_string = format!(
+            "JS object constructor name mismatch. Expected {}, provided {}.",
+            class_name, ctor_name
+        );
+        Err(JsValue::from(&error_string))
+    }
+}

packages/wasm-dpp/webpack.config.js

@@ -1,5 +1,6 @@
 const path = require('path');
 const webpack = require('webpack');
+const TerserPlugin = require('terser-webpack-plugin');
 
 module.exports = {
   entry: './lib/index.ts',
@@ -14,6 +15,14 @@ module.exports = {
     // as webpack names global object "self" for some reason
     globalObject: 'this',
   },
+  optimization: {
+    minimize: true,
+    minimizer: [new TerserPlugin({
+      terserOptions: {
+        keep_classnames: true,
+      },
+    })],
+  },
   mode: 'production',
   module: {
     rules: [

yarn.lock

@@ -1962,6 +1962,7 @@ __metadata:
     stream-browserify: ^3.0.0
     stream-http: ^3.2.0
     string_decoder: ^1.3.0
+    terser-webpack-plugin: ^5.3.1
     ts-loader: ^8.0.2
     typescript: ^3.9.5
     url: ^0.11.0