Add stablecoin conversion

README.md

@@ -413,11 +413,22 @@ authedClient.marginTransfer(params, callback);
 
 ```js
 const params = {
-  repay_only: false,
+  repay_only: false
 };
 authedClient.closePosition(params, callback);
 ```
 
+* [`convert`](https://docs.gdax.com/#create-conversion)
+
+```js
+const params = {
+  from: 'USD',
+  to: 'USDC',
+  amount: '100'
+};
+authedClient.convert(params, callback);
+```
+
 * [`deposit`, `withdraw`](https://docs.gdax.com/#deposits)
 
 ```js

index.d.ts

@@ -261,6 +261,9 @@ declare module 'gdax' {
         closePosition(params: any, callback: callback<any>): void;
         closePosition(params: any): Promise<any>;
 
+        convert(params: any, callback: callback<any>): void;
+        convert(params: any): Promise<any>;
+
         deposit(params: any, callback: callback<any>): void;
         deposit(params: any): Promise<any>;
 

lib/clients/authenticated.js

@@ -243,6 +243,11 @@ class AuthenticatedClient extends PublicClient {
     this._requireParams(params, ['repay_only']);
     return this.post(['position/close'], { body: params }, callback);
   }
+
+  convert(params, callback) {
+    this._requireParams(params, ['from', 'to', 'amount']);
+    return this.post(['conversions'], { body: params }, callback);
+  }
 
   deposit(params, callback) {
     this._requireParams(params, ['amount', 'currency', 'coinbase_account_id']);

tests/authenticated.spec.js

@@ -709,6 +709,36 @@ suite('AuthenticatedClient', () => {
       .catch(err => assert.ifError(err) || assert.fail());
   });
 
+  test('.convert()', done => {
+    const transfer = {
+      from: 'USD',
+      to: 'USDC',
+      amount: '100',
+    };
+
+    const expectedTransfer = transfer;
+
+    nock(EXCHANGE_API_URL)
+      .post('/conversions', expectedTransfer)
+      .times(2)
+      .reply(200, {});
+
+    let cbtest = new Promise((resolve, reject) => {
+      authClient.convert(transfer, err => {
+        if (err) {
+          reject(err);
+        }
+        resolve();
+      });
+    });
+
+    let promisetest = authClient.convert(transfer);
+
+    Promise.all([cbtest, promisetest])
+      .then(() => done())
+      .catch(err => assert.ifError(err) || assert.fail());
+  });
+
   test('.deposit()', done => {
     const transfer = {
       amount: 10480,
@@ -736,7 +766,7 @@ suite('AuthenticatedClient', () => {
 
     Promise.all([cbtest, promisetest])
       .then(() => done())
-      .catch(err => assert.ifError(err) || assert.fail);
+      .catch(err => assert.ifError(err) || assert.fail());
   });
 
   test('.depositPayment()', done => {
@@ -766,7 +796,7 @@ suite('AuthenticatedClient', () => {
 
     Promise.all([cbtest, promisetest])
       .then(() => done())
-      .catch(err => assert.ifError(err) || assert.fail);
+      .catch(err => assert.ifError(err) || assert.fail());
   });
 
   test('.depositCrypto()', done => {
@@ -823,7 +853,7 @@ suite('AuthenticatedClient', () => {
 
     Promise.all([cbtest, promisetest])
       .then(() => done())
-      .catch(err => assert.ifError(err) || assert.fail);
+      .catch(err => assert.ifError(err) || assert.fail());
   });
 
   test('.withdraw()', done => {
@@ -883,7 +913,7 @@ suite('AuthenticatedClient', () => {
 
     Promise.all([cbtest, promisetest])
       .then(() => done())
-      .catch(err => assert.ifError(err) || assert.fail);
+      .catch(err => assert.ifError(err) || assert.fail());
   });
 
   test('.createReport()', done => {