diff --git a/compiler/forget/src/HIR/BuildHIR.ts b/compiler/forget/src/HIR/BuildHIR.ts
index 4c7b7f453c..4053d3657b 100644
--- a/compiler/forget/src/HIR/BuildHIR.ts
+++ b/compiler/forget/src/HIR/BuildHIR.ts
@@ -1415,6 +1415,15 @@ function lowerExpression(
         loc: exprLoc,
       };
     }
+    case "UnaryExpression": {
+      let expr = exprPath as NodePath<t.UnaryExpression>;
+      return {
+        kind: "UnaryExpression",
+        operator: expr.node.operator,
+        value: lowerExpressionToPlace(builder, expr.get("argument")),
+        loc: exprLoc,
+      };
+    }
     default: {
       builder.pushError({
         reason: `(BuildHIR::lowerExpression) Handle ${exprPath.type} expressions`,
diff --git a/compiler/forget/src/Inference/InferReferenceEffects.ts b/compiler/forget/src/Inference/InferReferenceEffects.ts
index c5b94a31fe..1ee90e9335 100644
--- a/compiler/forget/src/Inference/InferReferenceEffects.ts
+++ b/compiler/forget/src/Inference/InferReferenceEffects.ts
@@ -559,7 +559,6 @@ function inferBlock(env: Environment, block: BasicBlock) {
         break;
       }
       case "UnaryExpression": {
-        // TODO check that value must be a primitive, or make conditional based on the operator
         valueKind = ValueKind.Immutable;
         effectKind = Effect.Read;
         break;
diff --git a/compiler/forget/src/__tests__/fixtures/hir/unary-expr.expect.md b/compiler/forget/src/__tests__/fixtures/hir/unary-expr.expect.md
new file mode 100644
index 0000000000..1c44af6054
--- /dev/null
+++ b/compiler/forget/src/__tests__/fixtures/hir/unary-expr.expect.md
@@ -0,0 +1,121 @@
+
+## Input
+
+```javascript
+function component(a) {
+  let t = { t: a };
+  let z = +t.t;
+  let q = -t.t;
+  let p = void t.t;
+  let n = delete t.t;
+  let m = !t.t;
+  let e = ~t.t;
+  let f = typeof t.t;
+  return { z, p, q, n, m, e, f };
+}
+
+```
+
+## Code
+
+```javascript
+function component(a) {
+  const $ = React.useMemoCache();
+  const c_0 = $[0] !== a;
+  let t;
+  if (c_0) {
+    t = { t: a };
+    $[0] = a;
+    $[1] = t;
+  } else {
+    t = $[1];
+  }
+  const c_2 = $[2] !== t.t;
+  let z;
+  if (c_2) {
+    z = +t.t;
+    $[2] = t.t;
+    $[3] = z;
+  } else {
+    z = $[3];
+  }
+  const c_4 = $[4] !== t.t;
+  let q;
+  if (c_4) {
+    q = -t.t;
+    $[4] = t.t;
+    $[5] = q;
+  } else {
+    q = $[5];
+  }
+  const c_6 = $[6] !== t.t;
+  let p;
+  if (c_6) {
+    p = void t.t;
+    $[6] = t.t;
+    $[7] = p;
+  } else {
+    p = $[7];
+  }
+  const c_8 = $[8] !== t.t;
+  let n;
+  if (c_8) {
+    n = delete t.t;
+    $[8] = t.t;
+    $[9] = n;
+  } else {
+    n = $[9];
+  }
+  const c_10 = $[10] !== t.t;
+  let m;
+  if (c_10) {
+    m = !t.t;
+    $[10] = t.t;
+    $[11] = m;
+  } else {
+    m = $[11];
+  }
+  const c_12 = $[12] !== t.t;
+  let e;
+  if (c_12) {
+    e = ~t.t;
+    $[12] = t.t;
+    $[13] = e;
+  } else {
+    e = $[13];
+  }
+  const c_14 = $[14] !== t.t;
+  let f;
+  if (c_14) {
+    f = typeof t.t;
+    $[14] = t.t;
+    $[15] = f;
+  } else {
+    f = $[15];
+  }
+  const c_16 = $[16] !== z;
+  const c_17 = $[17] !== p;
+  const c_18 = $[18] !== q;
+  const c_19 = $[19] !== n;
+  const c_20 = $[20] !== m;
+  const c_21 = $[21] !== e;
+  const c_22 = $[22] !== f;
+  let t23;
+  if (c_16 || c_17 || c_18 || c_19 || c_20 || c_21 || c_22) {
+    t23 = { z: z, p: p, q: q, n: n, m: m, e: e, f: f };
+    $[16] = z;
+    $[17] = p;
+    $[18] = q;
+    $[19] = n;
+    $[20] = m;
+    $[21] = e;
+    $[22] = f;
+    $[23] = t23;
+  } else {
+    t23 = $[23];
+  }
+  return t23;
+}
+
+```
+      
\ No newline at end of file
diff --git a/compiler/forget/src/__tests__/fixtures/hir/unary-expr.js b/compiler/forget/src/__tests__/fixtures/hir/unary-expr.js
new file mode 100644
index 0000000000..d93dd3ab0a
--- /dev/null
+++ b/compiler/forget/src/__tests__/fixtures/hir/unary-expr.js
@@ -0,0 +1,11 @@
+function component(a) {
+  let t = { t: a };
+  let z = +t.t;
+  let q = -t.t;
+  let p = void t.t;
+  let n = delete t.t;
+  let m = !t.t;
+  let e = ~t.t;
+  let f = typeof t.t;
+  return { z, p, q, n, m, e, f };
+}