Fix cjs build

.babelrc

@@ -0,0 +1,12 @@
+{
+  "presets": [
+    [ "@babel/preset-env", { "modules": "auto" } ]
+  ],
+  "plugins": [
+    "@babel/transform-runtime",
+     ["@babel/plugin-proposal-class-properties", { "loose": true }]
+  ],
+  "ignore": [
+    "**/*.test.js"
+  ]
+}

.gitignore

@@ -4,6 +4,7 @@ node_modules
 # builds
 build
 dist
+lib
 .rpt2_cache
 
 # misc

package.json

@@ -4,16 +4,14 @@
   "description": "Library for interacting with the serum dex",
   "license": "MIT",
   "repository": "serum-foundation/serum-js",
-  "main": "dist/index.js",
-  "module": "dist/index.module.js",
-  "unpkg": "dist/index.umd.js",
+  "main": "lib/index.js",
   "source": "src/index.js",
   "engines": {
     "node": ">=10"
   },
   "scripts": {
-    "build": "microbundle",
-    "start": "microbundle watch",
+    "build": "yarn babel src --out-dir lib",
+    "start": "yarn babel src --out-dir lib --watch",
     "prepare": "run-s build",
     "test": "run-s test:unit test:lint test:build",
     "test:build": "run-s build",
@@ -24,6 +22,11 @@
     "deploy": "gh-pages -d example/build"
   },
   "devDependencies": {
+    "@babel/cli": "^7.10.5",
+    "@babel/core": "^7.11.1",
+    "@babel/plugin-proposal-class-properties": "^7.10.4",
+    "@babel/plugin-transform-runtime": "^7.11.0",
+    "@babel/preset-env": "^7.11.0",
     "@solana/web3.js": "^0.64.0",
     "babel-eslint": "^10.0.3",
     "cross-env": "^7.0.2",
@@ -38,15 +41,14 @@
     "eslint-plugin-react": "^7.17.0",
     "eslint-plugin-standard": "^4.0.1",
     "gh-pages": "^2.2.0",
-    "microbundle": "^0.12.3",
     "npm-run-all": "^4.1.5",
     "prettier": "^2.0.4",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-scripts": "^3.4.1"
   },
   "files": [
-    "dist"
+    "lib"
   ],
   "jest": {
     "transformIgnorePatterns": [
@@ -61,5 +63,11 @@
     "@solana/web3.js": "^0.64.0",
     "bn.js": "^5.1.2",
     "buffer-layout": "^1.2.0"
-  }
+  },
+  "browserslist": [
+    ">0.2%",
+    "not dead",
+    "not op_mini all",
+    "maintained node versions"
+  ]
 }

src/index.js

@@ -1 +1 @@
-export { Slab } from './slab';
+export { MarketState, Orderbook } from './market-state';

src/instructions.js

@@ -1,35 +1,11 @@
 import { blob, Layout, struct, u16, u32, u8, union } from 'buffer-layout';
-import { u64 } from './layout';
+import { u64, VersionedLayout } from './layout';
 import { PublicKey } from '@solana/web3.js';
 
 export const DEX_PROGRAM_ID = new PublicKey(
   '6iM2JjaPVViB2u82aVjf3ZfHDNHQ4G635XgnvgN6CNhY',
 );
 
-class VersionedLayout extends Layout {
-  constructor(version, inner, property) {
-    super(inner.span > 0 ? inner.span + 1 : inner.span, property);
-    this.version = version;
-    this.inner = inner;
-  }
-
-  decode(b, offset = 0) {
-    if (b.readUInt8(offset) !== this._version) {
-      throw new Error('invalid version');
-    }
-    return this.inner.decode(b, offset + 1);
-  }
-
-  encode(src, b, offset = 0) {
-    b.writeUInt8(this.version, offset);
-    return 1 + this.inner.encode(src, b, offset + 1);
-  }
-
-  getSpan(b, offset = 0) {
-    return 1 + this.inner.getSpan(b, offset + 1);
-  }
-}
-
 export const INSTRUCTION_LAYOUT = new VersionedLayout(
   0,
   union(u32('instruction')),

src/layout.js

@@ -81,9 +81,41 @@ export class WideBits extends Layout {
   }
 }
 
+export class VersionedLayout extends Layout {
+  constructor(version, inner, property) {
+    super(inner.span > 0 ? inner.span + 1 : inner.span, property);
+    this.version = version;
+    this.inner = inner;
+  }
+
+  decode(b, offset = 0) {
+    if (b.readUInt8(offset) !== this._version) {
+      throw new Error('invalid version');
+    }
+    return this.inner.decode(b, offset + 1);
+  }
+
+  encode(src, b, offset = 0) {
+    b.writeUInt8(this.version, offset);
+    return 1 + this.inner.encode(src, b, offset + 1);
+  }
+
+  getSpan(b, offset = 0) {
+    return 1 + this.inner.getSpan(b, offset + 1);
+  }
+}
+
 export function setLayoutDecoder(layout, decoder) {
   const originalDecode = layout.decode;
   layout.decode = function decode(b, offset = 0) {
     return decoder(originalDecode.call(this, b, offset));
   };
 }
+
+export function setLayoutEncoder(layout, encoder) {
+  const originalEncode = layout.encode;
+  layout.encode = function encode(src, b, offset) {
+    return originalEncode(encoder(src), b, offset);
+  };
+  return layout;
+}