chore: drop legacy hack

Latest diffpatch@0.6.0 ships without cruft (:tm:)

Author: nikku

package-lock.json

@@ -39,8 +39,7 @@
     "esm": "^3.0.24",
     "mocha": "^8.4.0",
     "npm-run-all": "^4.1.2",
-    "rollup": "^4.19.0",
-    "rollup-plugin-hypothetical": "^2.1.0"
+    "rollup": "^4.19.0"
   },
   "dependencies": {
     "diffpatch": "^0.6.0",

package.json

@@ -1,4 +1,3 @@
-import hypothetical from 'rollup-plugin-hypothetical';
 import nodeResolve from '@rollup/plugin-node-resolve';
 
 import pkg from './package.json';
@@ -19,17 +18,6 @@ export default [
 function pgl(plugins = []) {
 
   return [
-    hypothetical({
-      allowFallthrough: true,
-      files: {
-        'chalk': `
-          export default null;
-        `,
-        'diff-match-patch': `
-          export default null;
-        `
-      }
-    }),
     nodeResolve(),
     ...plugins
   ];