Merge branch 'development' into feature/addSubproviders

* development: (50 commits)
  Add PR number to changelog
  Address feedback
  Add requestId to subscription messages and update json-schemas
  Remove isomorphic-fetch types from contracts package
  Update README
  Regenerate files
  Make it private
  Change package name
  Update README
  Make fileExtension configurable
  Rename abi-gen to typed-contracts
  Add docs for typed-contracts
  Remove TODOs
  Introduce separate ContextData type and rework it
  Check ABI is defined
  Introduce a const for 'contract.mustache'
  Improve error message
  Reuse util
  Fix a typo
  Introduce a const for 'function'
  ...

# Conflicts:
#	yarn.lock

2 files changed, 42 insertions, 0 deletions

diff --git a/packages/0x.js/src/utils/class_utils.ts b/packages/0x.js/src/utils/class_utils.ts
new file mode 100644
index 000000000..04e60ee57
--- /dev/null
+++ b/packages/0x.js/src/utils/class_utils.ts
@@ -0,0 +1,18 @@
+import * as _ from 'lodash';
+
+export const classUtils = {
+    // This is useful for classes that have nested methods. Nested methods don't get bound out of the box.
+    bindAll(self: any, exclude: string[] = ['contructor'], thisArg?: any): void {
+        for (const key of Object.getOwnPropertyNames(self)) {
+            const val = self[key];
+            if (!_.includes(exclude, key)) {
+                if (_.isFunction(val)) {
+                    self[key] = val.bind(thisArg || self);
+                } else if (_.isObject(val)) {
+                    classUtils.bindAll(val, exclude, self);
+                }
+            }
+        }
+        return self;
+    },
+};
diff --git a/packages/0x.js/src/utils/promisify.ts b/packages/0x.js/src/utils/promisify.ts
new file mode 100644
index 000000000..c114cf32f
--- /dev/null
+++ b/packages/0x.js/src/utils/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;
+}