feat(ShardingManager): add execArgv option (#2585)

src/sharding/Shard.js

@@ -14,9 +14,8 @@ class Shard extends EventEmitter {
   /**
    * @param {ShardingManager} manager Manager that is spawning this shard
    * @param {number} id ID of this shard
-   * @param {string[]} [args=[]] Command line arguments to pass to the script
    */
-  constructor(manager, id, args = []) {
+  constructor(manager, id) {
     super();
 
     /**
@@ -35,7 +34,13 @@ class Shard extends EventEmitter {
      * Arguments for the shard's process
      * @type {string[]}
      */
-    this.args = args;
+    this.args = manager.args;
+
+    /**
+     * Arguments for the shard's process executable
+     * @type {string[]}
+     */
+    this.execArgv = manager.execArgv;
 
     /**
      * Environment variables for the shard's process
@@ -91,7 +96,9 @@ class Shard extends EventEmitter {
   async spawn(waitForReady = true) {
     if (this.process) throw new Error('SHARDING_PROCESS_EXISTS', this.id);
 
-    this.process = childProcess.fork(path.resolve(this.manager.file), this.args, { env: this.env })
+    this.process = childProcess.fork(path.resolve(this.manager.file), this.args, {
+      env: this.env, execArgv: this.execArgv,
+    })
       .on('message', this._handleMessage.bind(this))
       .on('exit', this._exitListener);
 

src/sharding/ShardingManager.js

@@ -22,6 +22,7 @@ class ShardingManager extends EventEmitter {
    * @param {number|string} [options.totalShards='auto'] Number of shards to spawn, or "auto"
    * @param {boolean} [options.respawn=true] Whether shards should automatically respawn upon exiting
    * @param {string[]} [options.shardArgs=[]] Arguments to pass to the shard script when spawning
+   * @param {string[]} [options.execArgv=[]] Arguments to pass to the shard script executable when spawning
    * @param {string} [options.token] Token to use for automatic shard count and passing to shards
    */
   constructor(file, options = {}) {
@@ -30,6 +31,7 @@ class ShardingManager extends EventEmitter {
       totalShards: 'auto',
       respawn: true,
       shardArgs: [],
+      execArgv: [],
       token: null,
     }, options);
 
@@ -70,6 +72,12 @@ class ShardingManager extends EventEmitter {
      */
     this.shardArgs = options.shardArgs;
 
+    /**
+     * An array of arguments to pass to the executable
+     * @type {string[]}
+     */
+    this.execArgv = options.execArgv;
+
     /**
      * Token to use for obtaining the automatic shard count, and passing to shards
      * @type {?string}
@@ -90,7 +98,7 @@ class ShardingManager extends EventEmitter {
    * @returns {Shard}
    */
   createShard(id = this.shards.size) {
-    const shard = new Shard(this, id, this.shardArgs);
+    const shard = new Shard(this, id);
     this.shards.set(id, shard);
     /**
      * Emitted upon creating a shard.