diff --git a/packages/components/package.json b/packages/components/package.json
index 218747b9..e9549700 100644
--- a/packages/components/package.json
+++ b/packages/components/package.json
@@ -89,6 +89,7 @@
     "@types/react": "17.0.43"
   },
   "source": "./src/index.ts",
+  "browser": "dist/bundle.js",
   "main": "dist/src/index.js",
   "types": "dist/src/index.d.ts"
 }
diff --git a/packages/components/src/components/SquiggleChart.tsx b/packages/components/src/components/SquiggleChart.tsx
index 7dda92e4..a6bf12af 100644
--- a/packages/components/src/components/SquiggleChart.tsx
+++ b/packages/components/src/components/SquiggleChart.tsx
@@ -3,10 +3,12 @@ import _ from "lodash";
 import styled from "styled-components";
 import {
   run,
+  runPartial,
   errorValueToString,
   squiggleExpression,
+  bindings,
+  samplingParams,
 } from "@quri/squiggle-lang";
-import type { samplingParams } from "@quri/squiggle-lang";
 import { NumberShower } from "./NumberShower";
 import { DistributionChart } from "./DistributionChart";
 import { ErrorBox } from "./ErrorBox";
@@ -148,6 +150,8 @@ export interface SquiggleChartProps {
   /** CSS width of the element */
   width?: number;
   height?: number;
+  /** Bindings of previous variables declared */
+  bindings?: bindings;
 }
 
 export const SquiggleChart: React.FC<SquiggleChartProps> = ({
@@ -156,6 +160,7 @@ export const SquiggleChart: React.FC<SquiggleChartProps> = ({
   outputXYPoints = 1000,
   onChange = () => {},
   height = 60,
+  bindings = {},
   width = NaN,
 }: SquiggleChartProps) => {
   const target = React.useRef(null);
@@ -167,7 +172,7 @@ export const SquiggleChart: React.FC<SquiggleChartProps> = ({
     sampleCount: sampleCount,
     xyPointLength: outputXYPoints,
   };
-  let expressionResult = run(squiggleString, samplingInputs);
+  let expressionResult = run(squiggleString, bindings, samplingInputs);
   let internal: JSX.Element;
   if (expressionResult.tag === "Ok") {
     let expression = expressionResult.value;
diff --git a/packages/components/src/components/SquiggleEditor.tsx b/packages/components/src/components/SquiggleEditor.tsx
index 580db580..f85cf1e8 100644
--- a/packages/components/src/components/SquiggleEditor.tsx
+++ b/packages/components/src/components/SquiggleEditor.tsx
@@ -3,7 +3,9 @@ import * as ReactDOM from "react-dom";
 import { SquiggleChart } from "./SquiggleChart";
 import { CodeEditor } from "./CodeEditor";
 import styled from "styled-components";
-import type { squiggleExpression } from "@quri/squiggle-lang";
+import type { squiggleExpression, bindings } from "@quri/squiggle-lang";
+import { runPartial, errorValueToString } from "@quri/squiggle-lang";
+import { ErrorBox } from "./ErrorBox";
 
 export interface SquiggleEditorProps {
   /** The input string for squiggle */
@@ -26,6 +28,8 @@ export interface SquiggleEditorProps {
   onChange?(expr: squiggleExpression): void;
   /** The width of the element */
   width: number;
+  /** Previous variable declarations */
+  bindings: bindings;
 }
 
 const Input = styled.div`
@@ -46,6 +50,7 @@ export let SquiggleEditor: React.FC<SquiggleEditorProps> = ({
   diagramCount,
   onChange,
   environment,
+  bindings = {},
 }: SquiggleEditorProps) => {
   let [expression, setExpression] = React.useState(initialSquiggleString);
   return (
@@ -71,6 +76,7 @@ export let SquiggleEditor: React.FC<SquiggleEditorProps> = ({
         diagramCount={diagramCount}
         environment={environment}
         onChange={onChange}
+        bindings={bindings}
       />
     </div>
   );
@@ -107,3 +113,76 @@ export function renderSquiggleEditorToDom(props: SquiggleEditorProps) {
   );
   return parent;
 }
+
+export interface SquigglePartialProps {
+  /** The input string for squiggle */
+  initialSquiggleString?: string;
+  /** If the output requires monte carlo sampling, the amount of samples */
+  sampleCount?: number;
+  /** The amount of points returned to draw the distribution */
+  outputXYPoints?: number;
+  kernelWidth?: number;
+  pointDistLength?: number;
+  /** If the result is a function, where the function starts */
+  diagramStart?: number;
+  /** If the result is a function, where the function ends */
+  diagramStop?: number;
+  /** If the result is a function, how many points along the function it samples */
+  diagramCount?: number;
+  /** when the environment changes. Used again for notebook magic*/
+  onChange?(expr: bindings): void;
+  /** The width of the element */
+  width: number;
+  /** Previously declared variables */
+  bindings: bindings;
+}
+
+export let SquigglePartial: React.FC<SquigglePartialProps> = ({
+  initialSquiggleString = "",
+  onChange,
+  bindings,
+}: SquigglePartialProps) => {
+  let [expression, setExpression] = React.useState(initialSquiggleString);
+  let squiggleResult = runPartial(expression, bindings);
+  if (squiggleResult.tag == "Ok") {
+    if (onChange) onChange(squiggleResult.value);
+  }
+  return (
+    <div>
+      <Input>
+        <CodeEditor
+          value={expression}
+          onChange={setExpression}
+          oneLine={true}
+          showGutter={false}
+          height={20}
+        />
+      </Input>
+      {squiggleResult.tag == "Error" ? (
+        <ErrorBox heading="Error">
+          {errorValueToString(squiggleResult.value)}
+        </ErrorBox>
+      ) : (
+        <></>
+      )}
+    </div>
+  );
+};
+
+export function renderSquigglePartialToDom(props: SquigglePartialProps) {
+  let parent = document.createElement("div");
+  ReactDOM.render(
+    <SquigglePartial
+      {...props}
+      onChange={(bindings) => {
+        // @ts-ignore
+        parent.value = bindings;
+
+        parent.dispatchEvent(new CustomEvent("input"));
+        if (props.onChange) props.onChange(bindings);
+      }}
+    />,
+    parent
+  );
+  return parent;
+}
diff --git a/packages/components/src/index.ts b/packages/components/src/index.ts
index 364e6dcb..ffd9c8e0 100644
--- a/packages/components/src/index.ts
+++ b/packages/components/src/index.ts
@@ -1,7 +1,9 @@
 export { SquiggleChart } from "./components/SquiggleChart";
 export {
   SquiggleEditor,
+  SquigglePartial,
   renderSquiggleEditorToDom,
+  renderSquigglePartialToDom,
 } from "./components/SquiggleEditor";
 import SquigglePlayground, {
   renderSquigglePlaygroundToDom,
diff --git a/packages/squiggle-lang/__tests__/TS/JS_test.ts b/packages/squiggle-lang/__tests__/TS/JS_test.ts
index 43f981eb..33aae7db 100644
--- a/packages/squiggle-lang/__tests__/TS/JS_test.ts
+++ b/packages/squiggle-lang/__tests__/TS/JS_test.ts
@@ -1,23 +1,5 @@
-import {
-  run,
-  Distribution,
-  resultMap,
-  squiggleExpression,
-  errorValueToString,
-} from "../../src/js/index";
-
-let testRun = (x: string): squiggleExpression => {
-  let result = run(x, { sampleCount: 100, xyPointLength: 100 });
-  expect(result.tag).toEqual("Ok");
-  if (result.tag === "Ok") {
-    return result.value;
-  } else {
-    throw Error(
-      "Expected squiggle expression to evaluate but got error: " +
-        errorValueToString(result.value)
-    );
-  }
-};
+import { Distribution, resultMap } from "../../src/js/index";
+import { testRun } from "./TestHelpers";
 
 function Ok<b>(x: b) {
   return { tag: "Ok", value: x };
diff --git a/packages/squiggle-lang/__tests__/TS/TestHelpers.ts b/packages/squiggle-lang/__tests__/TS/TestHelpers.ts
index 3d4153ef..8ec0c3e1 100644
--- a/packages/squiggle-lang/__tests__/TS/TestHelpers.ts
+++ b/packages/squiggle-lang/__tests__/TS/TestHelpers.ts
@@ -8,7 +8,7 @@ import {
 } from "../../src/js/index";
 
 export function testRun(x: string): squiggleExpression {
-  let squiggleResult = run(x, { sampleCount: 1000, xyPointLength: 100 });
+  let squiggleResult = run(x, {}, { sampleCount: 1000, xyPointLength: 100 });
   // return squiggleResult.value
   if (squiggleResult.tag === "Ok") {
     return squiggleResult.value;
diff --git a/packages/squiggle-lang/src/js/index.ts b/packages/squiggle-lang/src/js/index.ts
index bc66ab99..fb67e47a 100644
--- a/packages/squiggle-lang/src/js/index.ts
+++ b/packages/squiggle-lang/src/js/index.ts
@@ -2,7 +2,9 @@ import * as _ from "lodash";
 import {
   genericDist,
   samplingParams,
-  evaluate,
+  evaluateUsingExternalBindings,
+  evaluatePartialUsingExternalBindings,
+  externalBindings,
   expressionValue,
   errorValue,
   distributionError,
@@ -46,7 +48,7 @@ import {
   Constructors_pointwiseLogarithm,
   Constructors_pointwisePower,
 } from "../rescript/Distributions/DistributionOperation/DistributionOperation.gen";
-export type { samplingParams, errorValue };
+export type { samplingParams, errorValue, externalBindings as bindings };
 
 export let defaultSamplingInputs: samplingParams = {
   sampleCount: 10000,
@@ -96,15 +98,28 @@ export type squiggleExpression =
 
 export function run(
   squiggleString: string,
+  bindings?: externalBindings,
   samplingInputs?: samplingParams
 ): result<squiggleExpression, errorValue> {
+  let b = bindings ? bindings : {};
   let si: samplingParams = samplingInputs
     ? samplingInputs
     : defaultSamplingInputs;
-  let result: result<expressionValue, errorValue> = evaluate(squiggleString);
+
+  let result: result<expressionValue, errorValue> =
+    evaluateUsingExternalBindings(squiggleString, b);
   return resultMap(result, (x) => createTsExport(x, si));
 }
 
+// Run Partial. A partial is a block of code that doesn't return a value
+export function runPartial(
+  squiggleString: string,
+  bindings: externalBindings,
+  _samplingInputs?: samplingParams
+): result<externalBindings, errorValue> {
+  return evaluatePartialUsingExternalBindings(squiggleString, bindings);
+}
+
 function createTsExport(
   x: expressionValue,
   sampEnv: samplingParams
@@ -166,7 +181,7 @@ function createTsExport(
   }
 }
 
-// Helper functions to convert the recsript representations that genType doesn't
+// Helper functions to convert the rescript representations that genType doesn't
 // cover
 function convertRawToTypescript(
   result: rescriptExport,
diff --git a/packages/squiggle-lang/src/rescript/TypescriptInterface.res b/packages/squiggle-lang/src/rescript/TypescriptInterface.res
index c4265178..f2758ba3 100644
--- a/packages/squiggle-lang/src/rescript/TypescriptInterface.res
+++ b/packages/squiggle-lang/src/rescript/TypescriptInterface.res
@@ -40,6 +40,12 @@ let evaluate = Reducer.evaluate
 @genType
 let evaluateUsingExternalBindings = Reducer.evaluateUsingExternalBindings
 
+@genType
+let evaluatePartialUsingExternalBindings = Reducer.evaluatePartialUsingExternalBindings
+
+@genType
+type externalBindings = Reducer.externalBindings
+
 @genType
 type expressionValue = ReducerInterface_ExpressionValue.expressionValue