debugger: enable linter on internal/inspector/inspect_client

PR-URL: #38417
Backport-PR-URL: #39446
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

lib/internal/inspector/inspect_client.js

@@ -20,17 +20,28 @@
  * IN THE SOFTWARE.
  */
 
-// TODO(trott): enable ESLint
-/* eslint-disable */
+// TODO(aduh95): use errors exported by the internal/errors module
+/* eslint-disable no-restricted-syntax */
 
 'use strict';
+
+const {
+  ArrayPrototypePush,
+  Error,
+  ErrorCaptureStackTrace,
+  FunctionPrototypeBind,
+  JSONParse,
+  JSONStringify,
+  ObjectKeys,
+  Promise,
+} = primordials;
+
 const Buffer = require('buffer').Buffer;
 const { EventEmitter } = require('events');
 const http = require('http');
 const URL = require('url');
-const util = require('util');
 
-const debuglog = util.debuglog('inspect');
+const debuglog = require('internal/util/debuglog').debuglog('inspect');
 
 const kOpCodeText = 0x1;
 const kOpCodeClose = 0x8;
@@ -49,14 +60,10 @@ const kTwoBytePayloadLengthField = 126;
 const kEightBytePayloadLengthField = 127;
 const kMaskingKeyWidthInBytes = 4;
 
-function isEmpty(obj) {
-  return Object.keys(obj).length === 0;
-}
-
 function unpackError({ code, message, data }) {
   const err = new Error(`${message} - ${data}`);
   err.code = code;
-  Error.captureStackTrace(err, unpackError);
+  ErrorCaptureStackTrace(err, unpackError);
   return err;
 }
 
@@ -169,7 +176,7 @@ function decodeFrameHybi17(data) {
 class Client extends EventEmitter {
   constructor() {
     super();
-    this.handleChunk = this._handleChunk.bind(this);
+    this.handleChunk = FunctionPrototypeBind(this._handleChunk, this);
 
     this._port = undefined;
     this._host = undefined;
@@ -202,7 +209,7 @@ class Client extends EventEmitter {
       }
       let payload;
       try {
-        payload = JSON.parse(payloadStr);
+        payload = JSONParse(payloadStr);
       } catch (parseError) {
         parseError.string = payloadStr;
         throw parseError;
@@ -247,9 +254,9 @@ class Client extends EventEmitter {
       const data = { id: ++this._lastId, method, params };
       this._pending[data.id] = (error, result) => {
         if (error) reject(unpackError(error));
-        else resolve(isEmpty(result) ? undefined : result);
+        else resolve(ObjectKeys(result).length ? result : undefined);
       };
-      const json = JSON.stringify(data);
+      const json = JSONStringify(data);
       debuglog('> %s', json);
       this._socket.write(encodeFrameHybi17(Buffer.from(json)));
     });
@@ -273,15 +280,15 @@ class Client extends EventEmitter {
             return;
           }
           try {
-            resolve(JSON.parse(resBody));
-          } catch (parseError) {
+            resolve(JSONParse(resBody));
+          } catch {
             reject(new Error(`Response didn't contain JSON: ${resBody}`));
 
           }
         }
 
         httpRes.on('error', reject);
-        httpRes.on('data', (chunk) => chunks.push(chunk));
+        httpRes.on('data', (chunk) => ArrayPrototypePush(chunks, chunk));
         httpRes.on('end', parseChunks);
       }
 
@@ -290,17 +297,16 @@ class Client extends EventEmitter {
     });
   }
 
-  connect(port, host) {
+  async connect(port, host) {
     this._port = port;
     this._host = host;
-    return this._discoverWebsocketPath()
-      .then((urlPath) => this._connectWebsocket(urlPath));
+    const urlPath = await this._discoverWebsocketPath();
+    return this._connectWebsocket(urlPath);
   }
 
-  _discoverWebsocketPath() {
-    return this._fetchJSON('/json')
-      .then(({ 0: { webSocketDebuggerUrl } }) =>
-        URL.parse(webSocketDebuggerUrl).path);
+  async _discoverWebsocketPath() {
+    const { 0: { webSocketDebuggerUrl } } = await this._fetchJSON('/json');
+    return URL.parse(webSocketDebuggerUrl).path;
   }
 
   _connectWebsocket(urlPath) {