BREAKING: Remove `--unstable` flag (#25522)

This commit effectively removes the --unstable flag.

It's still being parsed, but it only prints a warning that a granular
flag should be used instead and doesn't actually enable any
unstable feature.

Closes https://github.com/denoland/deno/issues/25485
Closes https://github.com/denoland/deno/issues/23237

8 files changed, 18 insertions, 77 deletions

diff --git a/cli/args/flags.rs b/cli/args/flags.rs
index bd92d878f..8e62152da 100644
--- a/cli/args/flags.rs
+++ b/cli/args/flags.rs
@@ -570,6 +570,7 @@ fn parse_packages_allowed_scripts(s: &str) -> Result<String, AnyError> {
   Clone, Default, Debug, Eq, PartialEq, serde::Serialize, serde::Deserialize,
 )]
 pub struct UnstableConfig {
+  // TODO(bartlomieju): remove in Deno 2.5
   pub legacy_flag_enabled: bool, // --unstable
   pub bare_node_builtins: bool,  // --unstable-bare-node-builts
   pub sloppy_imports: bool,
@@ -5476,6 +5477,7 @@ fn unstable_args_parse(
   matches: &mut ArgMatches,
   cfg: UnstableArgsConfig,
 ) {
+  // TODO(bartlomieju): remove in Deno 2.5
   if matches.get_flag("unstable") {
     flags.unstable_config.legacy_flag_enabled = true;
   }
@@ -8765,7 +8767,7 @@ mod tests {
   #[test]
   fn test_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec(svec!["deno", "test", "--unstable", "--no-npm", "--no-remote", "--trace-leaks", "--no-run", "--filter", "- foo", "--coverage=cov", "--clean", "--location", "https:foo", "--allow-net", "--permit-no-files", "dir1/", "dir2/", "--", "arg1", "arg2"]);
+    let r = flags_from_vec(svec!["deno", "test", "--no-npm", "--no-remote", "--trace-leaks", "--no-run", "--filter", "- foo", "--coverage=cov", "--clean", "--location", "https:foo", "--allow-net", "--permit-no-files", "dir1/", "dir2/", "--", "arg1", "arg2"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -8789,10 +8791,6 @@ mod tests {
           junit_path: None,
           hide_stacktraces: false,
         }),
-        unstable_config: UnstableConfig {
-          legacy_flag_enabled: true,
-          ..Default::default()
-        },
         no_npm: true,
         no_remote: true,
         location: Some(Url::parse("https://foo/").unwrap()),
@@ -10200,7 +10198,6 @@ mod tests {
       "deno",
       "bench",
       "--json",
-      "--unstable",
       "--no-npm",
       "--no-remote",
       "--no-run",
@@ -10228,10 +10225,6 @@ mod tests {
           },
           watch: Default::default(),
         }),
-        unstable_config: UnstableConfig {
-          legacy_flag_enabled: true,
-          ..Default::default()
-        },
         no_npm: true,
         no_remote: true,
         type_check_mode: TypeCheckMode::Local,
@@ -10802,10 +10795,10 @@ mod tests {
           conn_file: None,
         }),
         unstable_config: UnstableConfig {
-          legacy_flag_enabled: false,
           bare_node_builtins: true,
           sloppy_imports: false,
           features: svec!["ffi", "worker-options"],
+          ..Default::default()
         },
         ..Flags::default()
       }
diff --git a/cli/args/mod.rs b/cli/args/mod.rs
index f7623323f..203ceec50 100644
--- a/cli/args/mod.rs
+++ b/cli/args/mod.rs
@@ -1548,10 +1548,6 @@ impl CliOptions {
     &self.flags.unsafely_ignore_certificate_errors
   }
 
-  pub fn legacy_unstable_flag(&self) -> bool {
-    self.flags.unstable_config.legacy_flag_enabled
-  }
-
   pub fn unstable_bare_node_builtins(&self) -> bool {
     self.flags.unstable_config.bare_node_builtins
       || self.workspace().has_unstable("bare-node-builtins")
diff --git a/cli/factory.rs b/cli/factory.rs
index a51bc771e..1ec2104ed 100644
--- a/cli/factory.rs
+++ b/cli/factory.rs
@@ -714,10 +714,6 @@ impl CliFactory {
       let mut checker = FeatureChecker::default();
       checker.set_exit_cb(Box::new(crate::unstable_exit_cb));
       checker.set_warn_cb(Box::new(crate::unstable_warn_cb));
-      if cli_options.legacy_unstable_flag() {
-        checker.enable_legacy_unstable();
-        checker.warn_on_legacy_unstable();
-      }
       let unstable_features = cli_options.unstable_features();
       for granular_flag in crate::UNSTABLE_GRANULAR_FLAGS {
         if unstable_features.contains(&granular_flag.name.to_string()) {
@@ -856,7 +852,6 @@ impl CliFactory {
       unsafely_ignore_certificate_errors: cli_options
         .unsafely_ignore_certificate_errors()
         .clone(),
-      unstable: cli_options.legacy_unstable_flag(),
       create_hmr_runner,
       create_coverage_collector,
       node_ipc: cli_options.node_ipc_fd(),
diff --git a/cli/main.rs b/cli/main.rs
index c1f0c7910..6caeaa5dd 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -478,25 +478,14 @@ fn resolve_flags_and_init(
     Err(err) => exit_for_error(AnyError::from(err)),
   };
 
-  // TODO(bartlomieju): remove when `--unstable` flag is removed.
+  // TODO(bartlomieju): remove in Deno v2.5 and hard error then.
   if flags.unstable_config.legacy_flag_enabled {
-    #[allow(clippy::print_stderr)]
-    if matches!(flags.subcommand, DenoSubcommand::Check(_)) {
-      // can't use log crate because that's not setup yet
-      eprintln!(
-        "⚠️  {}",
-        colors::yellow(
-          "The `--unstable` flag is not needed for `deno check` anymore."
-        )
-      );
-    } else {
-      eprintln!(
-        "⚠️  {}",
-        colors::yellow(
-          "The `--unstable` flag is deprecated and will be removed in Deno 2.0. Use granular `--unstable-*` flags instead.\nLearn more at: https://docs.deno.com/runtime/manual/tools/unstable_flags"
-        )
-      );
-    }
+    log::warn!(
+      "⚠️  {}",
+      colors::yellow(
+        "The `--unstable` flag has been removed in Deno 2.0. Use granular `--unstable-*` flags instead.\nLearn more at: https://docs.deno.com/runtime/manual/tools/unstable_flags"
+      )
+    );
   }
 
   let default_v8_flags = match flags.subcommand {
diff --git a/cli/standalone/binary.rs b/cli/standalone/binary.rs
index 27308c901..1e84e1398 100644
--- a/cli/standalone/binary.rs
+++ b/cli/standalone/binary.rs
@@ -624,7 +624,7 @@ impl<'a> DenoCompileBinaryWriter<'a> {
       },
       node_modules,
       unstable_config: UnstableConfig {
-        legacy_flag_enabled: cli_options.legacy_unstable_flag(),
+        legacy_flag_enabled: false,
         bare_node_builtins: cli_options.unstable_bare_node_builtins(),
         sloppy_imports: cli_options.unstable_sloppy_imports(),
         features: cli_options.unstable_features(),
diff --git a/cli/standalone/mod.rs b/cli/standalone/mod.rs
index f1f687eed..0a08296d9 100644
--- a/cli/standalone/mod.rs
+++ b/cli/standalone/mod.rs
@@ -682,12 +682,6 @@ pub async fn run(
   let feature_checker = Arc::new({
     let mut checker = FeatureChecker::default();
     checker.set_exit_cb(Box::new(crate::unstable_exit_cb));
-    // TODO(bartlomieju): enable, once we deprecate `--unstable` in favor
-    // of granular --unstable-* flags.
-    // feature_checker.set_warn_cb(Box::new(crate::unstable_warn_cb));
-    if metadata.unstable_config.legacy_flag_enabled {
-      checker.enable_legacy_unstable();
-    }
     for feature in metadata.unstable_config.features {
       // `metadata` is valid for the whole lifetime of the program, so we
       // can leak the string here.
@@ -733,7 +727,6 @@ pub async fn run(
       seed: metadata.seed,
       unsafely_ignore_certificate_errors: metadata
         .unsafely_ignore_certificate_errors,
-      unstable: metadata.unstable_config.legacy_flag_enabled,
       create_hmr_runner: None,
       create_coverage_collector: None,
       node_ipc: None,
diff --git a/cli/tools/installer.rs b/cli/tools/installer.rs
index 065c5aa1c..bc8769de1 100644
--- a/cli/tools/installer.rs
+++ b/cli/tools/installer.rs
@@ -490,10 +490,6 @@ async fn resolve_shim_data(
     TypeCheckMode::Local => executable_args.push("--check".to_string()),
   }
 
-  if flags.unstable_config.legacy_flag_enabled {
-    executable_args.push("--unstable".to_string());
-  }
-
   for feature in &flags.unstable_config.features {
     executable_args.push(format!("--unstable-{}", feature));
   }
@@ -822,13 +818,7 @@ mod tests {
 
     create_install_shim(
       &HttpClientProvider::new(None, None),
-      &Flags {
-        unstable_config: UnstableConfig {
-          legacy_flag_enabled: true,
-          ..Default::default()
-        },
-        ..Flags::default()
-      },
+      &Flags::default(),
       InstallFlagsGlobal {
         module_url: "http://localhost:4545/echo_server.ts".to_string(),
         args: vec![],
@@ -850,12 +840,11 @@ mod tests {
     let content = fs::read_to_string(file_path).unwrap();
     if cfg!(windows) {
       assert!(content.contains(
-        r#""run" "--unstable" "--no-config" "http://localhost:4545/echo_server.ts""#
+        r#""run" "--no-config" "http://localhost:4545/echo_server.ts""#
       ));
     } else {
-      assert!(content.contains(
-        r#"run --unstable --no-config 'http://localhost:4545/echo_server.ts'"#
-      ));
+      assert!(content
+        .contains(r#"run --no-config 'http://localhost:4545/echo_server.ts'"#));
     }
   }
 
@@ -886,13 +875,7 @@ mod tests {
   async fn install_unstable_legacy() {
     let shim_data = resolve_shim_data(
       &HttpClientProvider::new(None, None),
-      &Flags {
-        unstable_config: UnstableConfig {
-          legacy_flag_enabled: true,
-          ..Default::default()
-        },
-        ..Default::default()
-      },
+      &Default::default(),
       &InstallFlagsGlobal {
         module_url: "http://localhost:4545/echo_server.ts".to_string(),
         args: vec![],
@@ -907,12 +890,7 @@ mod tests {
     assert_eq!(shim_data.name, "echo_server");
     assert_eq!(
       shim_data.args,
-      vec![
-        "run",
-        "--unstable",
-        "--no-config",
-        "http://localhost:4545/echo_server.ts",
-      ]
+      vec!["run", "--no-config", "http://localhost:4545/echo_server.ts",]
     );
   }
 
diff --git a/cli/worker.rs b/cli/worker.rs
index 64400af20..94884ff82 100644
--- a/cli/worker.rs
+++ b/cli/worker.rs
@@ -112,7 +112,6 @@ pub struct CliMainWorkerOptions {
   pub origin_data_folder_path: Option<PathBuf>,
   pub seed: Option<u64>,
   pub unsafely_ignore_certificate_errors: Option<Vec<String>>,
-  pub unstable: bool,
   pub skip_op_registration: bool,
   pub create_hmr_runner: Option<CreateHmrRunnerCb>,
   pub create_coverage_collector: Option<CreateCoverageCollectorCb>,
@@ -580,7 +579,6 @@ impl CliMainWorkerFactory {
         is_stdout_tty: deno_terminal::is_stdout_tty(),
         is_stderr_tty: deno_terminal::is_stderr_tty(),
         color_level: colors::get_color_level(),
-        unstable: shared.options.unstable,
         unstable_features,
         user_agent: version::DENO_VERSION_INFO.user_agent.to_string(),
         inspect: shared.options.is_inspecting,
@@ -775,7 +773,6 @@ fn create_web_worker_callback(
         color_level: colors::get_color_level(),
         is_stdout_tty: deno_terminal::is_stdout_tty(),
         is_stderr_tty: deno_terminal::is_stderr_tty(),
-        unstable: shared.options.unstable,
         unstable_features,
         user_agent: version::DENO_VERSION_INFO.user_agent.to_string(),
         inspect: shared.options.is_inspecting,