feat: json plugin

.changeset/light-plums-decide.md

@@ -0,0 +1,6 @@
+---
+"pkgbld": minor
+"pkgbld-internal": minor
+---
+
+added json plugin

pkgbld/src/builtin-plugins/json.ts

@@ -0,0 +1,8 @@
+import { Priority } from '../priorities';
+import { Provider } from '../types';
+
+export default async function(provider: Provider) {
+    const pluginJson = await provider.import('@rollup/plugin-json');
+
+    provider.provide(() => pluginJson(), Priority.preprocess);
+}

pkgbld/src/get-plugins.ts

@@ -7,6 +7,7 @@ import resolve from './builtin-plugins/resolve';
 import terser from './builtin-plugins/terser';
 import typescript from './builtin-plugins/typescript';
 import binify from './builtin-plugins/binify';
+import json from './builtin-plugins/json';
 
 export const plugins = [
     clean,
@@ -16,7 +17,8 @@ export const plugins = [
     resolve,
     terser,
     typescript,
-    binify
+    binify,
+    json
 ];
 
 const noop = () => undefined;