feat: Deprecate "import assertions" with a warning (#24743)

This commit deprecates "import assertions" proposal that has been
replaced with "import attributes".

Any time an import assertion is encountered a warning will be printed
to the terminal. This warning will be printed for both local and 
remote files (ie. user code and dependencies).

Import assertions support will be removed in Deno 2.

1 files changed, 5 insertions, 0 deletions

diff --git a/cli/main.rs b/cli/main.rs
index aafa7f009..6a7575dee 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -438,11 +438,15 @@ fn resolve_flags_and_init(
     DenoSubcommand::Lsp => vec!["--max-old-space-size=3072".to_string()],
     _ => {
       if *DENO_FUTURE {
+        // TODO(bartlomieju): I think this can be removed as it's handled by `deno_core`
+        // and its settings.
         // deno_ast removes TypeScript `assert` keywords, so this flag only affects JavaScript
         // TODO(petamoriken): Need to check TypeScript `assert` keywords in deno_ast
         vec!["--no-harmony-import-assertions".to_string()]
       } else {
         vec![
+          // TODO(bartlomieju): I think this can be removed as it's handled by `deno_core`
+          // and its settings.
           // If we're still in v1.X version we want to support import assertions.
           // V8 12.6 unshipped the support by default, so force it by passing a
           // flag.
@@ -455,6 +459,7 @@ fn resolve_flags_and_init(
   };
 
   init_v8_flags(&default_v8_flags, &flags.v8_flags, get_v8_flags_from_env());
+  // TODO(bartlomieju): remove last argument in Deno 2.
   deno_core::JsRuntime::init_platform(None, !*DENO_FUTURE);
   util::logger::init(flags.log_level);