fix: add missing source copy

@packages/utils/package.json

@@ -37,6 +37,7 @@
   "license": "MIT",
   "dependencies": {
     "execa": "^3.4.0",
+    "fs-extra": "^8.1.0",
     "is-builtin-module": "3.0.0",
     "read-pkg": "5.2.0",
     "require-from-string": "2.0.2",
@@ -45,7 +46,8 @@
     "yargs": "^15.1.0"
   },
   "devDependencies": {
-    "@types/yargs": "^15.0.3",
-    "@types/tmp": "^0.1.0"
+    "@types/fs-extra": "^8.0.1",
+    "@types/tmp": "^0.1.0",
+    "@types/yargs": "^15.0.3"
   }
 }

@packages/utils/pkg-check.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 const path = require('path');
-const fs = require('fs');
+const fs = require('fs-extra');
 const zlib = require('zlib');
 
 const execa = require('execa');
@@ -150,6 +150,7 @@ async function getTarballFiles(source, options) {
 		unsafeCleanup: true
 	});
 	const cwd = tmpDir.name;
+	await fs.copy(source, cwd);
 	const tarball = path.join(cwd, 'test-archive.tgz');
 	await execa('yarn', ['pack', '--filename', tarball], {cwd: source});
 

yarn.lock

@@ -8576,7 +8576,7 @@ resolve@1.1.7:
   resolved "https://registry.npmjs.org/resolve/-/resolve-1.1.7.tgz#203114d82ad2c5ed9e8e0411b3932875e889e97b"
   integrity sha1-IDEU2CrSxe2ejgQRs5ModeiJ6Xs=
 
-resolve@1.x, resolve@^1.1.6, resolve@^1.10.0, resolve@^1.3.2, resolve@^1.8.1, resolve@^1.12.0, resolve@^1.13.1:
+resolve@1.x, resolve@^1.1.6, resolve@^1.10.0, resolve@^1.12.0, resolve@^1.13.1, resolve@^1.3.2, resolve@^1.8.1:
   version "1.15.1"
   resolved "https://registry.npmjs.org/resolve/-/resolve-1.15.1.tgz#27bdcdeffeaf2d6244b95bb0f9f4b4653451f3e8"
   integrity sha512-84oo6ZTtoTUpjgNEr5SJyzQhzL72gaRodsSfyxC/AXRvwu0Yse9H8eF9IpGo7b8YetZhlI6v7ZQ6bKBFV/6S7w==