Documentation and exports cleanup (#13)

Author: acolytec3

README.md

@@ -17,42 +17,47 @@ Clone this repo and build following the [Compilation] instructions below.
 Import the module:
 
 ```
-import { ec_add, ec_mul, ec_pairing } from 'rustbn'
+import { initRustBN } from 'rustbn'
+
+const bn128 = await initRustBN()
 ```
 
 Curve Addition
 
 ```
 let inputHexString = ...
-let outputHexString = ec_add(inputHexString)
+let outputHexString = bn128.ec_add(inputHexString)
 ```
 
 Curve Multiplication
 
 ```
 let inputHexString = ...
-let outputHexString = ec_mul(inputHexString)
+let outputHexString = bn128.ec_mul(inputHexString)
 ```
 
 Curve Pairing
 ```
 let inputHexString = ...
-let outputHexString = ec_pairing(inputHexString)
+let outputHexString = bn128.ec_pairing(inputHexString)
 ```
 
 ## Developer
 
 ### Building the module
 
 For basic setup:
+
 - Install `rust` and `wasm-pack` via the [`wasm-pack` prerequisites](https://rustwasm.github.io/docs/wasm-pack/prerequisites/index.html)
 - Clone this repo
 - Install JS dependencies - `npm i`
-- Run `npm run build`
+- Run `npm run build:wasm` to compile the Rust code to WASM
+- Run `npm run wasm2b64` to convert the WASM bytecode to a base64 string consumable by the Typescript wrapper
+- Run `npm run build` to build the final JS outputs
 
 ### Build Outputs
 
-The build process outputs both CommonJS and ESM builds of the library and specifies entry points based on the `main` and `module` fields in `package.json`.  The CommonJS build is the direct output of `wasm-pack build --target nodejs` while the ESM build is a customized version of the output from `wasm-pack build --target web` that removes the need to use a bundler by converting the wasm bytecode to a base64 string and then placed in a JSON object that ESM environments can load directly.  Note, the ESM glue code is found in [`src.ts`](./src.ts/rustbn.ts)
+The build process outputs both CommonJS and ESM builds of the library and specifies entry points based on the `main`, `module`, and alternatively the `exports` fields in `package.json`. Both builds start with the wasm build from `wasm-bindgen` which is then loaded by a Typescript wrapper of the WASM output.  Our Typescript code is slightly different than the original Javascript generated by `wasm-bindgen` because the default ESM output would require a bundler.  
 
 ## License
 

package.json

@@ -24,13 +24,14 @@
     "build": "rm -rf dist && scripts/ts-build.sh",
     "prepare": "npm run build",
     "test": "vitest run test/*",
+    "build:wasm": "wasm-pack build --target web -d wasm",
     "wasm2b64": "node scripts/wasmToB64.js"
   },
   "main": "dist/cjs/rustbn.js",
   "module": "dist/esm/rustbn.js",
   "exports": {
-    "require": "dist/cjs/rustbn.js",
-    "import": "dist/esm/rustbn.js"
+    "require": "./dist/cjs/rustbn.js",
+    "import": "./dist/esm/rustbn.js"
   },
   "dependencies": {
     "@scure/base": "^1.1.5"