diff --git a/preludes/javascript.js b/preludes/javascript.js
new file mode 100644
index 000000000..6c55780d6
--- /dev/null
+++ b/preludes/javascript.js
@@ -0,0 +1,2 @@
+// can't quite define console.log in a way we can evaluate yet, but...
+function log(x) { return __semantic_print(x) }
diff --git a/src/Language/Preluded.hs b/src/Language/Preluded.hs
index 1a74ebe3a..2400d6887 100644
--- a/src/Language/Preluded.hs
+++ b/src/Language/Preluded.hs
@@ -7,6 +7,7 @@ module Language.Preluded
 import GHC.TypeLits
 import qualified Language.Python.Assignment as Python
 import qualified Language.Ruby.Assignment as Ruby
+import qualified Language.TypeScript.Assignment as TypeScript
 
 class Preluded syntax where
   type PreludePath syntax :: Symbol
@@ -16,3 +17,6 @@ instance Preluded Ruby.Term where
 
 instance Preluded Python.Term where
   type PreludePath Python.Term = "preludes/python.py"
+
+instance Preluded TypeScript.Term where
+  type PreludePath TypeScript.Term = "preludes/javascript.js"
diff --git a/src/Parsing/Parser.hs b/src/Parsing/Parser.hs
index 06602cbbd..a21431599 100644
--- a/src/Parsing/Parser.hs
+++ b/src/Parsing/Parser.hs
@@ -73,7 +73,7 @@ someAnalysisParser :: ( ApplyAll' typeclasses Go.Syntax
                    -> Language                                         -- ^ The 'Language' to select.
                    -> SomeAnalysisParser typeclasses (Record Location) -- ^ A 'SomeAnalysisParser abstracting the syntax type to be produced.
 someAnalysisParser _ Go         = SomeAnalysisParser goParser Nothing
-someAnalysisParser _ JavaScript = SomeAnalysisParser typescriptParser Nothing
+someAnalysisParser _ JavaScript = SomeAnalysisParser typescriptParser $ Just (File (TypeLevel.symbolVal (Proxy :: Proxy (PreludePath TypeScript.Term))) (Just JavaScript))
 someAnalysisParser _ PHP        = SomeAnalysisParser phpParser Nothing
 someAnalysisParser _ Python     = SomeAnalysisParser pythonParser $ Just (File (TypeLevel.symbolVal (Proxy :: Proxy (PreludePath Python.Term))) (Just Python))
 someAnalysisParser _ Ruby       = SomeAnalysisParser rubyParser $ Just (File (TypeLevel.symbolVal (Proxy :: Proxy (PreludePath Ruby.Term))) (Just Ruby))
diff --git a/src/Semantic/Util.hs b/src/Semantic/Util.hs
index d7da02ba1..6c0e3cb77 100644
--- a/src/Semantic/Util.hs
+++ b/src/Semantic/Util.hs
@@ -24,6 +24,7 @@ import           Semantic.Task
 
 import qualified Language.Python.Assignment as Python
 import qualified Language.Ruby.Assignment as Ruby
+import qualified Language.TypeScript.Assignment as TypeScript
 
 justEvaluating
   = runM
@@ -79,7 +80,7 @@ evalGoProject path = justEvaluating =<< evaluateProject goParser Language.Go Not
 evalRubyProject path = justEvaluating =<< evaluateProject rubyParser Language.Ruby rubyPrelude path
 evalPHPProject path = justEvaluating =<< evaluateProject phpParser Language.PHP Nothing path
 evalPythonProject path = justEvaluating =<< evaluateProject pythonParser Language.Python pythonPrelude path
-evalJavaScriptProject path = justEvaluating =<< evaluateProject typescriptParser Language.JavaScript Nothing path
+evalJavaScriptProject path = justEvaluating =<< evaluateProject typescriptParser Language.JavaScript javaScriptPrelude path
 evalTypeScriptProjectQuietly path = evaluatingWithHoles =<< evaluateProject typescriptParser Language.TypeScript Nothing path
 evalTypeScriptProject path = justEvaluating =<< evaluateProject typescriptParser Language.TypeScript Nothing path
 
@@ -87,6 +88,7 @@ typecheckGoFile path = checking =<< evaluateProjectWithCaching goParser Language
 
 rubyPrelude = Just $ File (TypeLevel.symbolVal (Proxy :: Proxy (PreludePath Ruby.Term))) (Just Language.Ruby)
 pythonPrelude = Just $ File (TypeLevel.symbolVal (Proxy :: Proxy (PreludePath Python.Term))) (Just Language.Python)
+javaScriptPrelude = Just $ File (TypeLevel.symbolVal (Proxy :: Proxy (PreludePath TypeScript.Term))) (Just Language.JavaScript)
 
 -- Evaluate a project, starting at a single entrypoint.
 evaluateProject parser lang prelude path = evaluatePackageWith id withTermSpans <$> runTask (readProject Nothing path lang [] >>= parsePackage parser prelude)