diff --git a/.eslintrc.js b/.eslintrc.js
index a87ad79..a37bcdd 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -4,7 +4,7 @@ module.exports = {
   parser: '@typescript-eslint/parser',
   plugins: ['@typescript-eslint'],
   root: true,
-  ignorePatterns: ['build'],
+  ignorePatterns: ['build', 'dist'],
   rules: {
     eqeqeq: ['error', 'always'],
   },
diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
new file mode 100644
index 0000000..0a1109a
--- /dev/null
+++ b/.github/workflows/node.js.yml
@@ -0,0 +1,25 @@
+# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
+
+name: Node.js CI
+
+on:
+  push:
+    branches: ['main']
+  pull_request:
+    branches: ['main']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js 18.x
+        uses: actions/setup-node@v3
+        with:
+          # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+          node-version: 18.x
+          cache: 'yarn'
+      - run: yarn --frozen-lockfile
+      - run: yarn lint
diff --git a/.prettierignore b/.prettierignore
index 0011dce..c310368 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,2 +1,3 @@
 # Build products
 build
+dist
diff --git a/package.json b/package.json
index 38a6c2e..1e3a5bd 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "serve:widget": "parcel serve ./src/*.html --dist-dir build",
     "cypress:open": "cypress open",
     "cypress:run": "cypress run",
-    "lint": "prettier --check . && eslint .",
+    "lint": "tsc --noEmit && prettier --check . && eslint .",
     "prepare": "husky install"
   },
   "browserslist": {
diff --git a/src/calculator-form.ts b/src/calculator-form.ts
index d3c1661..e7cbcd2 100644
--- a/src/calculator-form.ts
+++ b/src/calculator-form.ts
@@ -1,5 +1,5 @@
 import { html, css, nothing, TemplateResult } from 'lit';
-import { downIcon, questionIcon } from './icons';
+import { questionIcon } from './icons';
 import { select, multiselect, selectStyles, OptionParam } from './select';
 import { inputStyles } from './styles/input';
 import './currency-input';
diff --git a/src/calculator.ts b/src/calculator.ts
index 14e3e45..fec7649 100644
--- a/src/calculator.ts
+++ b/src/calculator.ts
@@ -12,7 +12,6 @@ import {
 } from './calculator-types';
 import { CALCULATOR_FOOTER } from './calculator-footer';
 import { fetchApi } from './api/fetch';
-import { NO_PROJECT } from './projects';
 import { downIcon } from './icons';
 
 const loadedTemplate = (
@@ -126,7 +125,7 @@ export class RewiringAmericaCalculator extends LitElement {
         tax_filing,
         household_size,
       });
-      return await fetchApi(
+      return await fetchApi<ICalculatedIncentiveResults>(
         this.apiKey,
         this.apiHost,
         '/api/v0/calculator',
diff --git a/src/state-calculator.ts b/src/state-calculator.ts
index b88b7df..55ade1a 100644
--- a/src/state-calculator.ts
+++ b/src/state-calculator.ts
@@ -23,6 +23,7 @@ import '@shoelace-style/shoelace/dist/components/spinner/spinner';
 import { STATES } from './states';
 import { authorityLogosStyles } from './authority-logos';
 import { APIResponse, APIUtilitiesResponse } from './api/calculator-types-v1';
+import { SlSelect } from '@shoelace-style/shoelace';
 
 const loadingTemplate = () => html`
   <div class="card card-content">
@@ -146,10 +147,10 @@ export class RewiringAmericaStateCalculator extends LitElement {
   override async firstUpdated() {
     // Give the browser a chance to paint
     await new Promise(r => setTimeout(r, 0));
-    const select = this.renderRoot.querySelector('sl-select');
+    const select = this.renderRoot.querySelector('sl-select') as SlSelect;
     const combobox = this.renderRoot
       .querySelector('sl-select')
-      ?.renderRoot.querySelector('div.select__combobox');
+      ?.renderRoot.querySelector('div.select__combobox') as HTMLElement;
 
     select?.addEventListener('keydown', event => {
       if (event.key === 'Tab' && select.open) {
diff --git a/src/state-incentive-details.ts b/src/state-incentive-details.ts
index 82dddef..100b576 100644
--- a/src/state-incentive-details.ts
+++ b/src/state-incentive-details.ts
@@ -445,10 +445,9 @@ export const stateIncentivesTemplate = (
     ]),
   ) as Record<Project, Incentive[]>;
 
-  const nonSelectedProjects = Object.entries(PROJECTS)
-    .filter(([project, _]) => !selectedProjects.includes(project as Project))
-    .sort(([a], [b]) => shortLabel(a).localeCompare(shortLabel(b)))
-    .map(([project, _]) => project);
+  const nonSelectedProjects = (Object.keys(PROJECTS) as Project[])
+    .filter(project => !selectedProjects.includes(project))
+    .sort((a, b) => shortLabel(a).localeCompare(shortLabel(b)));
 
   // Only offer "other" tabs if there are incentives for that project.
   const otherTabs = (
@@ -462,22 +461,19 @@ export const stateIncentivesTemplate = (
     .map(([project]) => project);
 
   const projectTab =
-    selectedProjectTab &&
-    selectedProjects.includes(selectedProjectTab as Project)
+    selectedProjectTab && selectedProjects.includes(selectedProjectTab)
       ? selectedProjectTab
       : selectedProjects[0];
   const otherTab =
-    selectedOtherTab &&
-    nonSelectedProjects.includes(selectedOtherTab as Project)
+    selectedOtherTab && nonSelectedProjects.includes(selectedOtherTab)
       ? selectedOtherTab
       : nonSelectedProjects[0];
 
   const selectedIncentives = incentivesByProject[projectTab] ?? [];
-  const selectedOtherIncentives =
-    incentivesByProject[otherTab as Project] ?? [];
+  const selectedOtherIncentives = incentivesByProject[otherTab] ?? [];
 
   const otherIncentivesLabel =
-    selectedIncentives.length == 0
+    selectedIncentives.length === 0
       ? 'Incentives available to you'
       : 'Other incentives available to you';
 
@@ -494,7 +490,7 @@ export const stateIncentivesTemplate = (
     selectedOtherIncentives,
     otherTabs,
     // If a nonexistent tab is selected, pretend the first one is selected.
-    otherTab as Project,
+    otherTab,
     onOtherTabSelected,
   )}
   ${authorityLogosTemplate(response)}`;