build: Initial linting setup (#1560)

* sets up linting config and runs `yarn lint --fix` once, so that all changes will show up correctly in future PRs.

* Note that there are still a lot of linter errors.

test/setupClient.ts

@@ -1,41 +1,36 @@
-import {Client, BroadcastClient} from 'xrpl-local'
-import {createMockRippled} from './mockRippled'
-import {getFreePort} from './testUtils'
+import { Client, BroadcastClient } from "xrpl-local";
+
+import { createMockRippled } from "./mockRippled";
+import { getFreePort } from "./testUtils";
 
 function setupMockRippledConnection(testcase, port) {
   return new Promise<void>((resolve, reject) => {
-    testcase.mockRippled = createMockRippled(port)
-    testcase._mockedServerPort = port
-    testcase.client = new Client('ws://localhost:' + port)
-    testcase.client
-      .connect()
-      .then(resolve)
-      .catch(reject)
-  })
+    testcase.mockRippled = createMockRippled(port);
+    testcase._mockedServerPort = port;
+    testcase.client = new Client(`ws://localhost:${port}`);
+    testcase.client.connect().then(resolve).catch(reject);
+  });
 }
 
 function setupMockRippledConnectionForBroadcast(testcase, ports) {
   return new Promise<void>((resolve, reject) => {
-    const servers = ports.map((port) => 'ws://localhost:' + port)
-    testcase.mocks = ports.map((port) => createMockRippled(port))
-    testcase.client = new BroadcastClient(servers)
-    testcase.client
-      .connect()
-      .then(resolve)
-      .catch(reject)
-  })
+    const servers = ports.map((port) => `ws://localhost:${port}`);
+    testcase.mocks = ports.map((port) => createMockRippled(port));
+    testcase.client = new BroadcastClient(servers);
+    testcase.client.connect().then(resolve).catch(reject);
+  });
 }
 
 function setup(this: any) {
   return getFreePort().then((port) => {
-    return setupMockRippledConnection(this, port)
-  })
+    return setupMockRippledConnection(this, port);
+  });
 }
 
 function setupBroadcast(this: any) {
   return Promise.all([getFreePort(), getFreePort()]).then((ports) => {
-    return setupMockRippledConnectionForBroadcast(this, ports)
-  })
+    return setupMockRippledConnectionForBroadcast(this, ports);
+  });
 }
 
 function teardown(this: any, done) {
@@ -43,18 +38,18 @@ function teardown(this: any, done) {
     .disconnect()
     .then(() => {
       if (this.mockRippled != null) {
-        this.mockRippled.close()
+        this.mockRippled.close();
       } else {
-        this.mocks.forEach((mock) => mock.close())
+        this.mocks.forEach((mock) => mock.close());
       }
-      setImmediate(done)
+      setImmediate(done);
     })
-    .catch(done)
+    .catch(done);
 }
 
 export default {
-  setup: setup,
-  teardown: teardown,
-  setupBroadcast: setupBroadcast,
-  createMockRippled: createMockRippled
-}
+  setup,
+  teardown,
+  setupBroadcast,
+  createMockRippled,
+};