fix: handle epipe errors

Author: jdx

example/ls.ts

@@ -12,6 +12,7 @@ class LS extends Command {
     dir: flags.string({
       char: 'd',
       default: process.cwd(),
+      required: true,
     }),
   }
 
@@ -25,4 +26,4 @@ class LS extends Command {
 }
 
 LS.run()
-.catch(require('@oclif/errors/handle'))
+  .then(() => {}, require('@oclif/errors/handle'))

src/command.ts

@@ -112,6 +112,7 @@ export default abstract class Command {
     const g: any = global
     g['http-call'] = g['http-call'] || {}
     g['http-call']!.userAgent = this.config.userAgent
+    this._swallowEPIPE()
     if (this._helpOverride()) return this._help()
   }
 
@@ -164,4 +165,15 @@ export default abstract class Command {
     this.log(this.config.userAgent)
     return this.exit(0)
   }
+
+  /**
+   * swallows stdout epipe errors
+   * this occurs when stdout closes such as when piping to head
+   */
+  protected _swallowEPIPE() {
+    process.stdout.on('error', err => {
+      if (err && err.code === 'EPIPE') return
+      throw err
+    })
+  }
 }