From 8a3d8ecde05134782b5b9b4bf1c56a64d5495ee3 Mon Sep 17 00:00:00 2001
From: Patrik Oldsberg <poldsberg@gmail.com>
Date: Tue, 17 Jan 2023 23:32:20 +0100
Subject: [PATCH] cli: make migrate package-exports add ./package.json

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
---
 .../src/commands/migrate/packageExports.ts    | 21 +++++++++++++++++--
 1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/packages/cli/src/commands/migrate/packageExports.ts b/packages/cli/src/commands/migrate/packageExports.ts
index 754a25e32b..9d5c6d6339 100644
--- a/packages/cli/src/commands/migrate/packageExports.ts
+++ b/packages/cli/src/commands/migrate/packageExports.ts
@@ -30,14 +30,31 @@ export async function command() {
 
   await Promise.all(
     packages.map(async ({ dir, packageJson }) => {
-      const { exports: exp } = packageJson;
-      if (!exp || typeof exp !== 'object' || Array.isArray(exp)) {
+      let { exports: exp } = packageJson;
+      if (!exp) {
         return;
       }
+      if (Array.isArray(exp)) {
+        throw new Error('Unexpected array in package.json exports field');
+      }
 
       let changed = false;
       let newPackageJson = packageJson;
 
+      // If exports is a string we rewrite it to an object to add package.json
+      if (typeof exp === 'string') {
+        changed = true;
+        exp = { '.': exp };
+        newPackageJson.exports = exp;
+      } else if (typeof exp !== 'object') {
+        return;
+      }
+
+      if (!exp['./package.json']) {
+        changed = true;
+        exp['./package.json'] = './package.json';
+      }
+
       const existingTypesVersions = JSON.stringify(packageJson.typesVersions);
 
       const typeEntries: Record<string, [string]> = {};