[flow] add "decl_kind" field in Name_def.Value

Summary:
We will use this to determine if this value corresponds to a const-variable.

Changelog: [internal]

Reviewed By: SamChou19815

Differential Revision: D70763512

fbshipit-source-id: 565c2f17318f8946d2a85d17ad79729aaa697381

src/analysis/env_builder/name_def.ml

@@ -1061,10 +1061,10 @@ class def_finder ~autocomplete_hooks ~react_jsx env_info toplevel_scope =
           let this_write_locs = obj_this_write_locs obj in
           begin
             match obj_properties_synthesizable ~this_write_locs obj with
-            | Unsynthesizable -> Some (Value { hints = []; expr = init })
+            | Unsynthesizable -> Some (Value { hints = []; expr = init; decl_kind = None })
             | synthesizable -> Some (ObjectValue { obj_loc = loc; obj; synthesizable })
           end
-        | (Some init, _) -> Some (Value { hints = []; expr = init })
+        | (Some init, _) -> Some (Value { hints = []; expr = init; decl_kind = Some kind })
         | (None, _) -> None
       in
       let (source, hints) =
@@ -2051,11 +2051,11 @@ class def_finder ~autocomplete_hooks ~react_jsx env_info toplevel_scope =
         this#visit_expression ~hints:(expression_pattern_hints e) ~cond:NonConditionalContext right
       | (None, Ast.Pattern.Expression e) ->
         let (_ : (_, _) Ast.Pattern.t) = this#assignment_pattern (lhs_loc, lhs_node) in
-        this#add_destructure_bindings (Value { hints = []; expr = right }) left;
+        this#add_destructure_bindings (Value { hints = []; expr = right; decl_kind = None }) left;
         this#visit_expression ~hints:(expression_pattern_hints e) ~cond:NonConditionalContext right
       | (None, _) ->
         let (_ : (_, _) Ast.Pattern.t) = this#assignment_pattern (lhs_loc, lhs_node) in
-        this#add_destructure_bindings (Value { hints = []; expr = right }) left;
+        this#add_destructure_bindings (Value { hints = []; expr = right; decl_kind = None }) left;
         this#visit_expression ~hints:(other_pattern_hints left) ~cond:NonConditionalContext right
       | ( Some operator,
           Ast.Pattern.Identifier
@@ -3203,7 +3203,7 @@ class def_finder ~autocomplete_hooks ~react_jsx env_info toplevel_scope =
       this#add_ordinary_binding
         match_keyword_loc
         (mk_reason RMatch match_keyword_loc)
-        (Binding (Root (Value { hints = []; expr = arg })));
+        (Binding (Root (Value { hints = []; expr = arg; decl_kind = None })));
       let value_hints =
         Base.List.foldi cases ~init:IMap.empty ~f:(fun i acc (_, { Case.body; _ }) ->
             if expression_is_definitely_synthesizable ~autocomplete_hooks body then
@@ -3218,7 +3218,7 @@ class def_finder ~autocomplete_hooks ~react_jsx env_info toplevel_scope =
             (case_loc, Ast.Expression.Identifier (Flow_ast_utils.match_root_ident case_loc))
           in
           ignore @@ this#expression match_root;
-          let acc = Value { hints = []; expr = match_root } in
+          let acc = Value { hints = []; expr = match_root; decl_kind = None } in
           this#add_match_destructure_bindings acc pattern;
           ignore @@ super#match_pattern pattern;
           run_opt this#expression guard;
@@ -3235,13 +3235,13 @@ class def_finder ~autocomplete_hooks ~react_jsx env_info toplevel_scope =
       this#add_ordinary_binding
         match_keyword_loc
         (mk_reason RMatch match_keyword_loc)
-        (Binding (Root (Value { hints = []; expr = arg })));
+        (Binding (Root (Value { hints = []; expr = arg; decl_kind = None })));
       Base.List.iter cases ~f:(fun (case_loc, { Case.pattern; body; guard; comments = _ }) ->
           let match_root =
             (case_loc, Ast.Expression.Identifier (Flow_ast_utils.match_root_ident case_loc))
           in
           ignore @@ this#expression match_root;
-          let acc = Value { hints = []; expr = match_root } in
+          let acc = Value { hints = []; expr = match_root; decl_kind = None } in
           this#add_match_destructure_bindings acc pattern;
           ignore @@ super#match_pattern pattern;
           run_opt this#expression guard;

src/analysis/env_builder/name_def_ordering.ml

@@ -962,7 +962,7 @@ struct
       in
       let depends_of_root state = function
         | Annotation { annot; tparams_map; _ } -> depends_of_annotation tparams_map annot state
-        | Value { hints; expr } ->
+        | Value { hints; expr; decl_kind = _ } ->
           let state = depends_of_hints state hints in
           depends_of_expression expr state
         | ObjectValue { obj; synthesizable = ObjectSynthesizable _; _ } ->

src/analysis/env_builder/name_def_types.ml

@@ -88,6 +88,7 @@ type dro_annot =
 type value = {
   hints: ast_hints;
   expr: (ALoc.t, ALoc.t) Ast.Expression.t;
+  decl_kind: Ast.Variable.kind option;
 }
 
 type root =

src/typing/env_resolution.ml

@@ -45,12 +45,12 @@ let try_cache : 'l. check:(unit -> 'l) -> cache:('l -> unit) -> Context.t -> 'l
     cache e;
     e
 
-let expression cx ?cond exp =
+let expression cx ?cond ?decl exp =
   let cache = Context.node_cache cx in
   let ((_, t), _) =
     try_cache
       cx
-      ~check:(fun () -> Statement.expression ?cond cx exp)
+      ~check:(fun () -> Statement.expression ?cond ?decl cx exp)
       ~cache:(Node_cache.set_expression cache)
   in
   t
@@ -466,7 +466,7 @@ let rec resolve_binding cx reason loc b =
       TypeUtil.optional t
     else
       t
-  | Root (Value { hints = _; expr }) -> expression cx expr
+  | Root (Value { hints = _; expr; decl_kind }) -> expression cx ?decl:decl_kind expr
   | Root (ObjectValue { obj_loc = loc; obj; synthesizable = ObjectSynthesizable _ }) ->
     let open Ast.Expression.Object in
     let resolve_prop ~bind_this ~prop_loc ~fn_loc fn =