diff --git a/packages/squiggle-lang/__tests__/TS/JS_test.ts b/packages/squiggle-lang/__tests__/TS/JS_test.ts
index 33b55fb5..871248da 100644
--- a/packages/squiggle-lang/__tests__/TS/JS_test.ts
+++ b/packages/squiggle-lang/__tests__/TS/JS_test.ts
@@ -1,6 +1,6 @@
 import { SqProject, SqValue } from "../../src/js";
 import { SqNumberValue } from "../../src/js/SqValue";
-import { failDefault, testRun } from "./TestHelpers";
+import { testRun } from "./TestHelpers";
 
 function Ok<b>(x: b) {
   return { tag: "Ok", value: x };
@@ -9,28 +9,11 @@ function Ok<b>(x: b) {
 describe("Simple calculations and results", () => {
   test("mean(normal(5,2))", () => {
     const result = testRun("mean(normal(5,2))"); // FIXME
-    expect(result.tag).toEqual("Number");
-    switch (result.tag) {
-      case "Number":
-        expect(result.value).toEqual(5);
-        break;
-      default:
-        fail();
-    }
-    //   tag: "number",
-    //   value: 5,
-    // });
+    expect(result.value).toEqual(5);
   });
   test("10+10", () => {
     let result = testRun("10 + 10") as SqNumberValue;
-    expect(result.tag).toEqual("Number");
-    switch (result.tag) {
-      case "Number":
-        expect(result.value).toEqual(20);
-        break;
-      default:
-        fail();
-    }
+    expect(result.value).toEqual(20);
   });
 });
 // describe("Log function", () => {
diff --git a/packages/squiggle-lang/__tests__/TS/PointSet_test.ts b/packages/squiggle-lang/__tests__/TS/PointSet_test.ts
index 11812681..60a8e4e4 100644
--- a/packages/squiggle-lang/__tests__/TS/PointSet_test.ts
+++ b/packages/squiggle-lang/__tests__/TS/PointSet_test.ts
@@ -1,5 +1,5 @@
 // import { errorValueToString } from "../../src/js/index";
-import { testRun, expectErrorToBeBounded } from "./TestHelpers";
+import { testRun, expectErrorToBeBounded, SqValueTag } from "./TestHelpers";
 import * as fc from "fast-check";
 
 describe("Mean of mixture is weighted average of means", () => {
@@ -20,7 +20,7 @@ describe("Mean of mixture is weighted average of means", () => {
           let lognormalWeight = y / weightDenom;
           let betaMean = 1 / (1 + b / a);
           let lognormalMean = m + s ** 2 / 2;
-          if (res.tag === "Number") {
+          if (res.tag === SqValueTag.Number) {
             expectErrorToBeBounded(
               res.value,
               betaWeight * betaMean + lognormalWeight * lognormalMean,
diff --git a/packages/squiggle-lang/__tests__/TS/SampleSet_test.ts b/packages/squiggle-lang/__tests__/TS/SampleSet_test.ts
index a072f2df..1fac3905 100644
--- a/packages/squiggle-lang/__tests__/TS/SampleSet_test.ts
+++ b/packages/squiggle-lang/__tests__/TS/SampleSet_test.ts
@@ -1,4 +1,4 @@
-import { expectErrorToBeBounded, failDefault, testRun } from "./TestHelpers";
+import { expectErrorToBeBounded, testRun, SqValueTag } from "./TestHelpers";
 import * as fc from "fast-check";
 
 // Beware: float64Array makes it appear in an infinite loop.
@@ -19,7 +19,7 @@ let arrayGen = () =>
 let makeSampleSet = (samples: number[]) => {
   let sampleList = samples.map((x) => x.toFixed(20)).join(",");
   let result = testRun(`SampleSet.fromList([${sampleList}])`);
-  if (result.tag === "Distribution") {
+  if (result.tag === SqValueTag.Distribution) {
     return result.value;
   } else {
     fail("Expected to be distribution");
@@ -104,7 +104,7 @@ describe("cumulative density function", () => {
         } else if (typeof cdfValue == "number") {
           expect(Math.round(1e5 * cdfValue) / 1e5).toBeLessThanOrEqual(1);
         } else {
-          failDefault();
+          fail();
         }
       })
     );
@@ -166,7 +166,7 @@ describe("mean is mean", () => {
               1
             );
           } else {
-            failDefault();
+            fail();
           }
         }
       )
@@ -191,7 +191,7 @@ describe("mean is mean", () => {
               1
             );
           } else {
-            failDefault();
+            fail();
           }
         }
       )
diff --git a/packages/squiggle-lang/__tests__/TS/TestHelpers.ts b/packages/squiggle-lang/__tests__/TS/TestHelpers.ts
index 05b14408..ceb807e6 100644
--- a/packages/squiggle-lang/__tests__/TS/TestHelpers.ts
+++ b/packages/squiggle-lang/__tests__/TS/TestHelpers.ts
@@ -1,4 +1,5 @@
-import { run, SqValue } from "../../src/js";
+import { run, SqValueTag } from "../../src/js";
+export { SqValueTag };
 
 export function testRun(x: string) {
   const { result, bindings } = run(x); // FIXME - set environment
@@ -20,10 +21,6 @@ export function testRun(x: string) {
   }
 }
 
-export function failDefault() {
-  expect("be reached").toBe("codepath should never");
-}
-
 /**
  * This appears also in `TestHelpers.res`. According to https://www.math.net/percent-error, it computes
  * absolute error when numerical stability concerns make me not want to compute relative error.