fix(install): update lockfile when using package.json (#26458)

This commit makes sure that `deno add`, `deno install` and `deno remove`
update the lockfile if only `package.json` file is present.

Fixes https://github.com/denoland/deno/issues/26270

1 files changed, 4 insertions, 0 deletions

diff --git a/cli/tools/registry/pm.rs b/cli/tools/registry/pm.rs
index bd5290998..2060b9a13 100644
--- a/cli/tools/registry/pm.rs
+++ b/cli/tools/registry/pm.rs
@@ -723,6 +723,10 @@ async fn npm_install_after_modification(
   // npm install
   cache_deps::cache_top_level_deps(&cli_factory, jsr_resolver).await?;
 
+  if let Some(lockfile) = cli_factory.cli_options()?.maybe_lockfile() {
+    lockfile.write_if_changed()?;
+  }
+
   Ok(())
 }