7 files changed, 184 insertions, 0 deletions
diff --git a/packages/base-contract/.npmignore b/packages/base-contract/.npmignore
new file mode 100644
index 000000000..ad5ffcd56
--- /dev/null
+++ b/packages/base-contract/.npmignore
@@ -0,0 +1,5 @@
+.*
+yarn-error.log
+/scripts/
+/src/
+tsconfig.json
diff --git a/packages/base-contract/CHANGELOG.md b/packages/base-contract/CHANGELOG.md
new file mode 100644
index 000000000..74e983f1c
--- /dev/null
+++ b/packages/base-contract/CHANGELOG.md
@@ -0,0 +1,5 @@
+# CHANGELOG
+
+## v0.0.1 - _TBD, 2018_
+
+    * Initial release (#TBD)
diff --git a/packages/base-contract/README.md b/packages/base-contract/README.md
new file mode 100644
index 000000000..ff0d4d303
--- /dev/null
+++ b/packages/base-contract/README.md
@@ -0,0 +1,53 @@
+## @0xproject/base-contract
+
+BaseContract to derive all auto-generated wrappers from
+
+## Installation
+
+```bash
+yarn add @0xproject/base-contract
+```
+
+## Usage
+
+```javascript
+import { BaseContract } from '@0xproject/base-contract';
+```
+
+## Contributing
+
+We strongly recommend that the community help us make improvements and determine the future direction of the protocol. To report bugs within this package, please create an issue in this repository.
+
+Please read our [contribution guidelines](../../CONTRIBUTING.md) before getting started.
+
+### Install Dependencies
+
+If you don't have yarn workspaces enabled (Yarn < v1.0) - enable them:
+
+```bash
+yarn config set workspaces-experimental true
+```
+
+Then install dependencies
+
+```bash
+yarn install
+```
+
+### Build
+
+```bash
+yarn build
+```
+
+or
+
+```bash
+yarn build:watch
+```
+
+### Lint
+
+```bash
+yarn lint
+```
diff --git a/packages/base-contract/package.json b/packages/base-contract/package.json
new file mode 100644
index 000000000..6edbed161
--- /dev/null
+++ b/packages/base-contract/package.json
@@ -0,0 +1,39 @@
+{
+    "name": "@0xproject/base-contract",
+    "version": "0.0.1",
+    "description": "0x Base TS contract",
+    "main": "lib/index.js",
+    "types": "lib/index.d.ts",
+    "scripts": {
+        "build:watch": "tsc -w",
+        "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/base-contract/README.md",
+    "devDependencies": {
+        "@0xproject/tslint-config": "^0.4.9",
+        "@types/lodash": "^4.14.86",
+        "npm-run-all": "^4.1.2",
+        "shx": "^0.2.2",
+        "tslint": "5.8.0",
+        "typescript": "2.7.1",
+        "ethers-typescript-typings": "^0.0.1",
+        "web3-typescript-typings": "^0.9.11"
+    },
+    "dependencies": {
+        "@0xproject/types": "^0.2.3",
+        "@0xproject/web3-wrapper": "^0.1.14",
+        "ethers-contracts": "^2.2.1",
+        "lodash": "^4.17.4",
+        "web3": "^0.20.0"
+    }
+}
diff --git a/packages/base-contract/src/index.ts b/packages/base-contract/src/index.ts
new file mode 100644
index 000000000..cc1e16a13
--- /dev/null
+++ b/packages/base-contract/src/index.ts
@@ -0,0 +1,68 @@
+import { TxData, TxDataPayable } from '@0xproject/types';
+import { Web3Wrapper } from '@0xproject/web3-wrapper';
+import * as ethersContracts from 'ethers-contracts';
+import * as _ from 'lodash';
+import * as Web3 from 'web3';
+
+export class BaseContract {
+    protected _ethersInterface: ethersContracts.Interface;
+    protected _web3Wrapper: Web3Wrapper;
+    public abi: Web3.ContractAbi;
+    public address: string;
+    protected static _transformABIData(
+        abis: Web3.DataItem[],
+        values: any[],
+        transformation: (type: string, value: any) => any,
+    ): any {
+        return _.map(values, (value: any, i: number) =>
+            BaseContract._transformTypedData(abis[i].type, value, transformation),
+        );
+    }
+    protected static _lowercaseAddress(type: string, value: string): string {
+        return type === 'address' ? value.toLowerCase() : value;
+    }
+    protected static _bigNumberToString(type: string, value: string): string {
+        return _.isObject(value) && (value as any).isBigNumber ? value.toString() : value;
+    }
+    private static _transformTypedData(
+        type: string,
+        values: any,
+        transformation: (type: string, value: any) => any,
+    ): any {
+        const trailingArrayRegex = /\[\d*\]$/;
+        if (type.match(trailingArrayRegex)) {
+            const arrayItemType = type.replace(trailingArrayRegex, '');
+            return _.map(values, value => this._transformTypedData(arrayItemType, value, transformation));
+        } else {
+            return transformation(type, values);
+        }
+    }
+    protected async _applyDefaultsToTxDataAsync<T extends Partial<TxData | TxDataPayable>>(
+        txData: T,
+        estimateGasAsync?: (txData: T) => Promise<number>,
+    ): Promise<TxData> {
+        // Gas amount sourced with the following priorities:
+        // 1. Optional param passed in to public method call
+        // 2. Global config passed in at library instantiation
+        // 3. Gas estimate calculation + safety margin
+        const removeUndefinedProperties = _.pickBy;
+        const txDataWithDefaults = {
+            to: this.address,
+            ...removeUndefinedProperties(this._web3Wrapper.getContractDefaults()),
+            ...removeUndefinedProperties(txData as any),
+            // HACK: TS can't prove that T is spreadable.
+            // Awaiting https://github.com/Microsoft/TypeScript/pull/13288 to be merged
+        };
+        if (_.isUndefined(txDataWithDefaults.gas) && !_.isUndefined(estimateGasAsync)) {
+            const estimatedGas = await estimateGasAsync(txData);
+            txDataWithDefaults.gas = estimatedGas;
+        }
+        return txDataWithDefaults;
+    }
+    constructor(web3Wrapper: Web3Wrapper, abi: Web3.ContractAbi, address: string) {
+        this._web3Wrapper = web3Wrapper;
+        this.abi = abi;
+        this.address = address;
+        this._ethersInterface = new ethersContracts.Interface(abi);
+    }
+}
diff --git a/packages/base-contract/tsconfig.json b/packages/base-contract/tsconfig.json
new file mode 100644
index 000000000..8114d99cd
--- /dev/null
+++ b/packages/base-contract/tsconfig.json
@@ -0,0 +1,11 @@
+{
+    "extends": "../../tsconfig",
+    "compilerOptions": {
+        "outDir": "lib"
+    },
+    "include": [
+        "./src/**/*",
+        "../../node_modules/web3-typescript-typings/index.d.ts",
+        "../../node_modules/ethers-typescript-typings/index.d.ts"
+    ]
+}
diff --git a/packages/base-contract/tslint.json b/packages/base-contract/tslint.json
new file mode 100644
index 000000000..ffaefe83a
--- /dev/null
+++ b/packages/base-contract/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": ["@0xproject/tslint-config"]
+}