fixup

Author: ronag

lib/internal/streams/body.js

@@ -44,6 +44,7 @@ const {
   codes: {
     ERR_INVALID_ARG_TYPE,
     ERR_INVALID_RETURN_VALUE,
+    ERR_INVALID_STATE,
   },
 } = require('internal/errors');
 
@@ -213,8 +214,7 @@ class Body {
     const { readable } = this[kState];
 
     if (readable === null) {
-      // TODO: What error?
-      throw new Error('readable consumed');
+      throw new ERR_INVALID_STATE('Body is not readable');
     }
 
     this[kState].readable = null;
@@ -226,8 +226,7 @@ class Body {
     const { writable } = this[kState];
 
     if (writable === null) {
-      // TODO: What error?
-      throw new Error('writable consumed');
+      throw new ERR_INVALID_STATE('Body is not writable');
     }
 
     this[kState].writable = null;
@@ -237,13 +236,11 @@ class Body {
 
   nodeStream() {
     if (this.readable === null) {
-      // TODO: What error?
-      throw new Error('readable consumed');
+      throw new ERR_INVALID_STATE('Body is not readable');
     }
 
     if (this.writable === null) {
-      // TODO: What error?
-      throw new Error('writable consumed');
+      throw new ERR_INVALID_STATE('Body is not writable');
     }
 
     if (this[kState].readable === this[kState].writable) {