From a77ffdb7ea4ec66983d3481cc486c821a5df6b1b Mon Sep 17 00:00:00 2001
From: flywind <xzsflywind@gmail.com>
Date: Sat, 9 Apr 2022 23:52:11 +0800
Subject: [PATCH] fix #17286 nim check -b:js works (#19704)

* fix #17286 nim check -b:js works

* fix
---
 compiler/main.nim     |  2 ++
 tests/misc/t17286.nim | 16 ++++++++++++++++
 2 files changed, 18 insertions(+)
 create mode 100644 tests/misc/t17286.nim

diff --git a/compiler/main.nim b/compiler/main.nim
index e27a4f6d1e..a4425e510c 100644
--- a/compiler/main.nim
+++ b/compiler/main.nim
@@ -65,6 +65,8 @@ proc commandCheck(graph: ModuleGraph) =
   if optWasNimscript in conf.globalOptions:
     defineSymbol(conf.symbols, "nimscript")
     defineSymbol(conf.symbols, "nimconfig")
+  elif conf.backend == backendJs:
+    setTarget(conf.target, osJS, cpuJS)
   semanticPasses(graph)  # use an empty backend for semantic checking only
   compileProject(graph)
 
diff --git a/tests/misc/t17286.nim b/tests/misc/t17286.nim
new file mode 100644
index 0000000000..3a54e624eb
--- /dev/null
+++ b/tests/misc/t17286.nim
@@ -0,0 +1,16 @@
+discard """
+  cmd: "nim check -b:js $file"
+  action: "compile"
+"""
+
+# bug #17286
+
+import std/compilesettings
+
+static:
+  doAssert querySetting(backend) == "js"
+  doAssert defined(js)
+  doAssert not defined(c)
+
+import random
+randomize()
\ No newline at end of file