BREAKING: `DENO_FUTURE=1` by default, or welcome to Deno 2.0 (#25213)

This commit effectively turns Deno into Deno 2.0.

This is done by forcing `DENO_FUTURE=1` env var, that was available in
the past few months to try Deno 2 changes.

This commit contains several breaking changes scheduled for Deno 2:
- all deprecated JavaScript APIs are not available any more, mostly
`Deno.*` APIs
- `window` global is removed
- FFI, WebGPU and FS APIs are now stable and don't require
`--unstable-*` flags
- import assertions are no longer supported
- "bring your own node modules" is enabled by default

This is the first commit in a series that are scheduled before the Deno
2 release.

Follow up work is tracked in
https://github.com/denoland/deno/issues/25241.

---------

Co-authored-by: Asher Gomez <ashersaupingomez@gmail.com>
Co-authored-by: Nayeem Rahman <nayeemrmn99@gmail.com>
Co-authored-by: Nathan Whitaker <nathan@deno.com>

2 files changed, 13 insertions, 26 deletions

diff --git a/cli/args/flags.rs b/cli/args/flags.rs
index 3ac280869..050d55f4c 100644
--- a/cli/args/flags.rs
+++ b/cli/args/flags.rs
@@ -8244,8 +8244,12 @@ mod tests {
 
   #[test]
   fn install() {
-    let r =
-      flags_from_vec(svec!["deno", "install", "jsr:@std/http/file-server"]);
+    let r = flags_from_vec(svec![
+      "deno",
+      "install",
+      "-g",
+      "jsr:@std/http/file-server"
+    ]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -8257,7 +8261,7 @@ mod tests {
             root: None,
             force: false,
           }),
-          global: false,
+          global: true,
         }),
         ..Flags::default()
       }
@@ -8290,7 +8294,7 @@ mod tests {
   #[test]
   fn install_with_flags() {
     #[rustfmt::skip]
-    let r = flags_from_vec(svec!["deno", "install", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--unsafely-ignore-certificate-errors", "--reload", "--lock", "lock.json", "--cert", "example.crt", "--cached-only", "--allow-read", "--allow-net", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229", "--name", "file_server", "--root", "/foo", "--force", "--env=.example.env", "jsr:@std/http/file-server", "foo", "bar"]);
+    let r = flags_from_vec(svec!["deno", "install", "--global", "--import-map", "import_map.json", "--no-remote", "--config", "tsconfig.json", "--no-check", "--unsafely-ignore-certificate-errors", "--reload", "--lock", "lock.json", "--cert", "example.crt", "--cached-only", "--allow-read", "--allow-net", "--v8-flags=--help", "--seed", "1", "--inspect=127.0.0.1:9229", "--name", "file_server", "--root", "/foo", "--force", "--env=.example.env", "jsr:@std/http/file-server", "foo", "bar"]);
     assert_eq!(
       r.unwrap(),
       Flags {
@@ -8302,7 +8306,7 @@ mod tests {
             root: Some("/foo".to_string()),
             force: true,
           }),
-          global: false,
+          global: true,
         }),
         import_map_path: Some("import_map.json".to_string()),
         no_remote: true,
@@ -8682,25 +8686,7 @@ mod tests {
           watch: None,
           bare: true,
         }),
-        node_modules_dir: Some(true),
-        code_cache_enabled: true,
-        ..Flags::default()
-      }
-    );
-
-    let r = flags_from_vec(svec![
-      "deno",
-      "run",
-      "--node-modules-dir=false",
-      "script.ts"
-    ]);
-    assert_eq!(
-      r.unwrap(),
-      Flags {
-        subcommand: DenoSubcommand::Run(RunFlags::new_default(
-          "script.ts".to_string(),
-        )),
-        node_modules_dir: Some(false),
+        node_modules_dir: None,
         code_cache_enabled: true,
         ..Flags::default()
       }
diff --git a/cli/args/mod.rs b/cli/args/mod.rs
index a0888ca58..e339cb714 100644
--- a/cli/args/mod.rs
+++ b/cli/args/mod.rs
@@ -117,8 +117,8 @@ pub static DENO_DISABLE_PEDANTIC_NODE_WARNINGS: Lazy<bool> = Lazy::new(|| {
     .is_some()
 });
 
-pub static DENO_FUTURE: Lazy<bool> =
-  Lazy::new(|| std::env::var("DENO_FUTURE").ok().is_some());
+// TODO(2.0): remove this in a follow up.
+pub static DENO_FUTURE: Lazy<bool> = Lazy::new(|| true);
 
 pub fn jsr_url() -> &'static Url {
   static JSR_URL: Lazy<Url> = Lazy::new(|| {
@@ -1680,6 +1680,7 @@ impl CliOptions {
         }
       });
 
+    // TODO(2.0): remove this conditional and enable these features in `99_main.js` by default.
     if *DENO_FUTURE {
       let future_features = [
         deno_runtime::deno_ffi::UNSTABLE_FEATURE_NAME.to_string(),