Update to TypeScript 5.x (#88)

As part of the migration from `importsNotUsedAsValues`, incorporate eslint
to get the same desired "type-only imports whenever possible" without
switching to the new `verbatimModuleSyntax` (which is challenging for
commonjs packages such as this, and would require rewriting all imports
and exports to use an older style).

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Trevor Scheer <trevor.scheer@gmail.com>

Author: renovate[bot]

.circleci/config.yml

@@ -40,6 +40,7 @@ jobs:
     steps:
       - setup-node:
           node-version: <<parameters.node-version>>
+      - run: npm run build
       - run: npm run test:ci
       - store_test_results:
           path: junit.xml
@@ -51,6 +52,13 @@ jobs:
       - setup-node
       - run: npm run prettier-check
 
+  Lint:
+    docker:
+    - image: cimg/base:stable
+    steps:
+      - setup-node
+      - run: npm run lint
+
   Spell Check:
     docker:
     - image: cimg/base:stable
@@ -71,4 +79,6 @@ workflows:
                 - "16"
                 - "18"
       - Prettier
-      - Spell Check
+      - Lint
+      - Spell Check
+      

.eslintrc.cjs

@@ -0,0 +1,17 @@
+module.exports = {
+  overrides: [
+    {
+      files: ['src/**/*.ts'],
+      parser: '@typescript-eslint/parser',
+      plugins: ['@typescript-eslint'],
+      parserOptions: {
+        project: 'tsconfig.eslint.json',
+        tsconfigRootDir: __dirname,
+      },
+      rules: {
+        '@typescript-eslint/consistent-type-imports': 'error',
+      },
+    },
+  ],
+  root: true,
+};