diff --git a/package-lock.json b/package-lock.json
index d900ac83..f39e505e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -33,6 +33,7 @@
         "@typescript-eslint/parser": "^5.37.0",
         "babel-eslint": "^10.1.0",
         "babel-loader": "^9.1.2",
+        "check-dts": "^0.7.2",
         "core-js": "^3.25.2",
         "dox": "^1.0.0",
         "eslint": "^8.23.1",
@@ -4646,6 +4647,12 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/unist": {
+      "version": "2.0.10",
+      "resolved": "https://registry.npmjs.org/@types/unist/-/unist-2.0.10.tgz",
+      "integrity": "sha512-IfYcSBWE3hLpBg8+X2SEa8LVkJdJEkT2Ese2aaLs3ptGdVtABxndrMaxuFlQ1qdFf9Q5rDvDpxI3WwgvKFAsQA==",
+      "dev": true
+    },
     "node_modules/@types/ws": {
       "version": "8.5.4",
       "dev": true,
@@ -6475,6 +6482,27 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/check-dts": {
+      "version": "0.7.2",
+      "resolved": "https://registry.npmjs.org/check-dts/-/check-dts-0.7.2.tgz",
+      "integrity": "sha512-ZflsEhv7SXlgNECrNIw1WmMJZ1787KtS62anWknLPI+k9g9OY2eA/UfT+Tsb0i0eWLUZHtFfznrNtGlQJrGaKw==",
+      "dev": true,
+      "dependencies": {
+        "fast-glob": "^3.2.12",
+        "nanospinner": "^1.1.0",
+        "picocolors": "^1.0.0",
+        "vfile-location": "^4.1.0"
+      },
+      "bin": {
+        "check-dts": "bin.js"
+      },
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "typescript": ">=4.0.0"
+      }
+    },
     "node_modules/chokidar": {
       "version": "3.5.3",
       "dev": true,
@@ -13598,6 +13626,15 @@
         "node": "^10 || ^12 || ^13.7 || ^14 || >=15.0.1"
       }
     },
+    "node_modules/nanospinner": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/nanospinner/-/nanospinner-1.1.0.tgz",
+      "integrity": "sha512-yFvNYMig4AthKYfHFl1sLj7B2nkHL4lzdig4osvl9/LdGbXwrdFRoqBS98gsEsOakr0yH+r5NZ/1Y9gdVB8trA==",
+      "dev": true,
+      "dependencies": {
+        "picocolors": "^1.0.0"
+      }
+    },
     "node_modules/natural-compare": {
       "version": "1.4.0",
       "dev": true,
@@ -18815,6 +18852,19 @@
         "node": ">=8"
       }
     },
+    "node_modules/unist-util-stringify-position": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/unist-util-stringify-position/-/unist-util-stringify-position-3.0.3.tgz",
+      "integrity": "sha512-k5GzIBZ/QatR8N5X2y+drfpWG8IDBzdnVj6OInRNWm1oXrzydiaAT2OQiA8DPRRZyAKb9b6I2a6PxYklZD0gKg==",
+      "dev": true,
+      "dependencies": {
+        "@types/unist": "^2.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/universalify": {
       "version": "2.0.0",
       "dev": true,
@@ -18949,6 +18999,73 @@
         "node": ">=0.10.48"
       }
     },
+    "node_modules/vfile": {
+      "version": "5.3.7",
+      "resolved": "https://registry.npmjs.org/vfile/-/vfile-5.3.7.tgz",
+      "integrity": "sha512-r7qlzkgErKjobAmyNIkkSpizsFPYiUPuJb5pNW1RB4JcYVZhs4lIbVqk8XPk033CV/1z8ss5pkax8SuhGpcG8g==",
+      "dev": true,
+      "dependencies": {
+        "@types/unist": "^2.0.0",
+        "is-buffer": "^2.0.0",
+        "unist-util-stringify-position": "^3.0.0",
+        "vfile-message": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/vfile-location": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/vfile-location/-/vfile-location-4.1.0.tgz",
+      "integrity": "sha512-YF23YMyASIIJXpktBa4vIGLJ5Gs88UB/XePgqPmTa7cDA+JeO3yclbpheQYCHjVHBn/yePzrXuygIL+xbvRYHw==",
+      "dev": true,
+      "dependencies": {
+        "@types/unist": "^2.0.0",
+        "vfile": "^5.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/vfile-message": {
+      "version": "3.1.4",
+      "resolved": "https://registry.npmjs.org/vfile-message/-/vfile-message-3.1.4.tgz",
+      "integrity": "sha512-fa0Z6P8HUrQN4BZaX05SIVXic+7kE3b05PWAtPuYP9QLHsLKYR7/AlLW3NtOrpXRLeawpDLMsVkmk5DG0NXgWw==",
+      "dev": true,
+      "dependencies": {
+        "@types/unist": "^2.0.0",
+        "unist-util-stringify-position": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/vfile/node_modules/is-buffer": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.5.tgz",
+      "integrity": "sha512-i2R6zNFDwgEHJyQUtJEk0XFi1i0dPFn/oqjK3/vPCcDeJvW5NQ83V8QbicfF1SupOaB0h8ntgBC2YiE7dfyctQ==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/void-elements": {
       "version": "2.0.1",
       "dev": true,
diff --git a/package.json b/package.json
index 863ef044..7f81b750 100644
--- a/package.json
+++ b/package.json
@@ -22,7 +22,8 @@
     "build:site": "cp dist/function-plot.js site/js/function-plot.js",
     "start": "webpack-dev-server",
     "docs": "typedoc --excludeExternals --externalPattern \"**/node_modules/**\" --out site/docs src/index.ts",
-    "test": "jest"
+    "test": "jest",
+    "test:types": "check-dts test/** src/**"
   },
   "files": [
     "/dist"
@@ -67,6 +68,7 @@
     "@typescript-eslint/parser": "^5.37.0",
     "babel-eslint": "^10.1.0",
     "babel-loader": "^9.1.2",
+    "check-dts": "^0.7.2",
     "core-js": "^3.25.2",
     "dox": "^1.0.0",
     "eslint": "^8.23.1",
diff --git a/src/types.ts b/src/types.ts
index 1a0921a5..dd00723c 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -149,7 +149,7 @@ export interface FunctionPlotDatum {
    * - interval: uses the interval arithmetic sampler to render a disjoint set of rectangles
    * - scatter: dotted line
    */
-  graphType?: 'polyline' | 'interval' | 'scatter'
+  graphType?: 'polyline' | 'interval' | 'scatter' | 'text'
 
   /**
    * The type of function to render
diff --git a/test/types.ts b/test/types.ts
new file mode 100644
index 00000000..f3304a35
--- /dev/null
+++ b/test/types.ts
@@ -0,0 +1,21 @@
+// test with `npx check-dts`
+import functionPlot from '../src/'
+
+functionPlot({
+  target: '#playground',
+  data: [
+    {
+      graphType: 'text',
+      location: [1, 1],
+      text: 'hello world'
+    },
+    {
+      graphType: 'text',
+      location: [-1, -1],
+      text: 'foo bar',
+      attr: {
+        'text-anchor': 'end'
+      }
+    }
+  ]
+})