feat: Allow declared fields

src/index.ts

@@ -4,7 +4,10 @@ import { format, Options as PrettierOptions } from 'prettier';
 
 // @ts-expect-error We're only importing so we can create a config item, so we don't care about types
 import bts from '@babel/plugin-transform-typescript';
-const babelTsTransform = createConfigItem([bts, { onlyRemoveTypeImports: true }]);
+const babelTsTransform = createConfigItem([
+  bts,
+  { allowDeclareFields: true, onlyRemoveTypeImports: true },
+]);
 
 // @ts-expect-error We're only importing so we can create a config item, so we don't care about types
 import bsd from '@babel/plugin-syntax-decorators';

test/index.test.ts

@@ -139,4 +139,32 @@ export default class Baz {}
 `;
     expect(await removeTypes(contents)).toEqual(expected);
   });
+
+  it('removes declared properties', async () => {
+    const contents = `export default class Baz {
+  declare foo: string;
+}
+`;
+
+    const expected = `export default class Baz {}
+`;
+
+    expect(await removeTypes(contents)).toEqual(expected);
+  });
+
+  it('keeps declared properties with decorators', async () => {
+    const contents = `export default class Baz {
+  @service
+  declare foo: string;
+}
+`;
+
+    const expected = `export default class Baz {
+  @service
+  foo;
+}
+`;
+
+    expect(await removeTypes(contents)).toEqual(expected);
+  });
 });