feat(formatter): expose to public API

source/index.ts

@@ -1,4 +1,6 @@
 import tsd from './lib';
+import formatter from './lib/formatter';
 
 export * from './lib/assertions/assert';
+export {formatter};
 export default tsd;

source/test/cli.ts

@@ -2,6 +2,7 @@ import path from 'path';
 import test from 'ava';
 import execa from 'execa';
 import readPkgUp from 'read-pkg-up';
+import tsd, {formatter} from '..';
 
 interface ExecaError extends Error {
 	readonly exitCode: number;
@@ -95,3 +96,18 @@ test('cli typings and files flags', async t => {
 	t.is(exitCode, 1);
 	t.true(stderr.includes('✖  5:19  Argument of type number is not assignable to parameter of type string.'));
 });
+
+test('exported formatter matches tsd results', async t => {
+	const options = {
+		cwd: path.join(__dirname, 'fixtures/failure'),
+	};
+
+	const {stderr: cliResults} = await t.throwsAsync<ExecaError>(execa('../../../cli.js', options));
+
+	t.true(cliResults.includes('✖  5:19  Argument of type number is not assignable to parameter of type string.'));
+
+	const tsdResults = await tsd(options);
+	const formattedResults = formatter(tsdResults);
+
+	t.true(formattedResults.includes('✖  5:19  Argument of type number is not assignable to parameter of type string.'));
+});