fix(add): create deno.json when running `deno add jsr:<pkg>` (#26275)

Fixes https://github.com/denoland/deno/issues/26119.

Originally I wanted to put them in package.json if there's no deno.json,
but on second thought it makes more sense to just create a deno.json

1 files changed, 9 insertions, 4 deletions

diff --git a/cli/tools/registry/pm.rs b/cli/tools/registry/pm.rs
index 3276acfbf..ff900d113 100644
--- a/cli/tools/registry/pm.rs
+++ b/cli/tools/registry/pm.rs
@@ -400,14 +400,17 @@ impl std::fmt::Display for AddCommandName {
 
 fn load_configs(
   flags: &Arc<Flags>,
+  has_jsr_specifiers: impl FnOnce() -> bool,
 ) -> Result<(CliFactory, Option<NpmConfig>, Option<DenoConfig>), AnyError> {
   let cli_factory = CliFactory::from_flags(flags.clone());
   let options = cli_factory.cli_options()?;
   let npm_config = NpmConfig::from_options(options)?;
   let (cli_factory, deno_config) = match DenoConfig::from_options(options)? {
     Some(config) => (cli_factory, Some(config)),
-    None if npm_config.is_some() => (cli_factory, None),
-    None => {
+    None if npm_config.is_some() && !has_jsr_specifiers() => {
+      (cli_factory, None)
+    }
+    _ => {
       let factory = create_deno_json(flags, options)?;
       let options = factory.cli_options()?.clone();
       (
@@ -427,7 +430,9 @@ pub async fn add(
   add_flags: AddFlags,
   cmd_name: AddCommandName,
 ) -> Result<(), AnyError> {
-  let (cli_factory, npm_config, deno_config) = load_configs(&flags)?;
+  let (cli_factory, npm_config, deno_config) = load_configs(&flags, || {
+    add_flags.packages.iter().any(|s| s.starts_with("jsr:"))
+  })?;
   let mut npm_config = ConfigUpdater::maybe_new(npm_config).await?;
   let mut deno_config = ConfigUpdater::maybe_new(deno_config).await?;
 
@@ -764,7 +769,7 @@ pub async fn remove(
   flags: Arc<Flags>,
   remove_flags: RemoveFlags,
 ) -> Result<(), AnyError> {
-  let (_, npm_config, deno_config) = load_configs(&flags)?;
+  let (_, npm_config, deno_config) = load_configs(&flags, || false)?;
 
   let mut configs = [
     ConfigUpdater::maybe_new(npm_config).await?,