Refactor web3Wrapper to a separate package

6 files changed, 88 insertions, 0 deletions

diff --git a/packages/utils/README.md b/packages/utils/README.md
new file mode 100644
index 000000000..5191e0350
--- /dev/null
+++ b/packages/utils/README.md
@@ -0,0 +1,10 @@
+utils
+------
+
+Utils to be shared across 0x projects and packages
+
+## Install
+
+```bash
+yarn add @0xproject/utils
+```
diff --git a/packages/utils/package.json b/packages/utils/package.json
new file mode 100644
index 000000000..f49a95f28
--- /dev/null
+++ b/packages/utils/package.json
@@ -0,0 +1,33 @@
+{
+  "name": "@0xproject/utils",
+  "version": "0.0.1",
+  "description": "0x TS utils",
+  "main": "lib/index.js",
+  "types": "lib/index.d.ts",
+  "scripts": {
+    "build": "tsc",
+    "clean": "shx rm -rf lib",
+    "lint": "tslint --project . 'src/**/*.ts'"
+  },
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/0xProject/0x.js.git"
+  },
+  "bugs": {
+    "url": "https://github.com/0xProject/0x.js/issues"
+  },
+  "homepage": "https://github.com/0xProject/0x.js/packages/utils/README.md",
+  "devDependencies": {
+    "@0xproject/tslint-config": "^0.2.0",
+    "@types/lodash": "^4.14.86",
+    "npm-run-all": "^4.1.2",
+    "shx": "^0.2.2",
+    "tslint": "5.8.0",
+    "typescript": "~2.6.1"
+  },
+  "dependencies": {
+    "bignumber.js": "~4.1.0",
+    "lodash": "^4.17.4"
+  }
+}
diff --git a/packages/utils/src/index.ts b/packages/utils/src/index.ts
new file mode 100644
index 000000000..a61f04ad2
--- /dev/null
+++ b/packages/utils/src/index.ts
@@ -0,0 +1 @@
+export {promisify} from './promisify';
diff --git a/packages/utils/src/promisify.ts b/packages/utils/src/promisify.ts
new file mode 100644
index 000000000..c114cf32f
--- /dev/null
+++ b/packages/utils/src/promisify.ts
@@ -0,0 +1,24 @@
+import * as _ from 'lodash';
+
+/**
+ * Transforms callback-based function -- func(arg1, arg2 .. argN, callback) -- into an ES6-compatible Promise.
+ * Promisify provides a default callback of the form (error, result) and rejects when `error` is not null. You can also
+ * supply thisArg object as the second argument which will be passed to `apply`.
+ */
+export function promisify<T>(
+    originalFn: (
+        ...args: any[],
+        // HACK: This can't be properly typed without variadic kinds https://github.com/Microsoft/TypeScript/issues/5453
+    ) => void,
+    thisArg?: any,
+): (...callArgs: any[]) => Promise<T> {
+    const promisifiedFunction = async (...callArgs: any[]): Promise<T> => {
+        return new Promise<T>((resolve, reject) => {
+            const callback = (err: Error|null, data?: T) => {
+                _.isNull(err) ? resolve(data) : reject(err);
+            };
+            originalFn.apply(thisArg, [...callArgs, callback]);
+        });
+    };
+    return promisifiedFunction;
+}
diff --git a/packages/utils/tsconfig.json b/packages/utils/tsconfig.json
new file mode 100644
index 000000000..111df6d3b
--- /dev/null
+++ b/packages/utils/tsconfig.json
@@ -0,0 +1,15 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "target": "es5",
+    "lib": [ "es2017", "dom"],
+    "outDir": "lib",
+    "sourceMap": true,
+    "declaration": true,
+    "noImplicitAny": true,
+    "strictNullChecks": true
+  },
+  "include": [
+    "./src/**/*"
+  ]
+}
diff --git a/packages/utils/tslint.json b/packages/utils/tslint.json
new file mode 100644
index 000000000..a07795151
--- /dev/null
+++ b/packages/utils/tslint.json
@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "@0xproject/tslint-config"
+  ]
+}