Add `tsconfig.json` to `bun-types` (#2587)

* Add tsconfig.json to bun-types. Document 'extends' pattern.

* Updates

* Update bun init to use extends:bun-types

* Update type:module recommendation

* Add note about transpilation. Closes #2553

* Make typescript a peer dep

* Revert changes to docs

* Revert tsconfig extends

* Update readme

* FMC

* Undo changed

1 files changed, 22 insertions, 0 deletions

diff --git a/src/cli/init_command.zig b/src/cli/init_command.zig
index a7abd02e8..1b95d47fa 100644
--- a/src/cli/init_command.zig
+++ b/src/cli/init_command.zig
@@ -282,6 +282,22 @@ pub const InitCommand = struct {
                 break :brk true;
             };
 
+            const needs_typescript_dependency = brk: {
+                if (fields.object.get("devDependencies")) |deps| {
+                    if (deps.hasAnyPropertyNamed(&.{"typescript"})) {
+                        break :brk false;
+                    }
+                }
+
+                if (fields.object.get("peerDependencies")) |deps| {
+                    if (deps.hasAnyPropertyNamed(&.{"typescript"})) {
+                        break :brk false;
+                    }
+                }
+
+                break :brk true;
+            };
+
             if (needs_dev_dependencies) {
                 var dev_dependencies = fields.object.get("devDependencies") orelse js_ast.Expr.init(js_ast.E.Object, js_ast.E.Object{}, logger.Loc.Empty);
                 const version = comptime brk: {
@@ -293,6 +309,12 @@ pub const InitCommand = struct {
                 try dev_dependencies.data.e_object.putString(alloc, "bun-types", comptime std.fmt.comptimePrint("^{any}", .{version.fmt("")}));
                 try fields.object.put(alloc, "devDependencies", dev_dependencies);
             }
+
+            if (needs_typescript_dependency) {
+                var peer_dependencies = fields.object.get("peer_dependencies") orelse js_ast.Expr.init(js_ast.E.Object, js_ast.E.Object{}, logger.Loc.Empty);
+                try peer_dependencies.data.e_object.putString(alloc, "typescript", "^5.0.0");
+                try fields.object.put(alloc, "peerDependencies", peer_dependencies);
+            }
         }
 
         write_package_json: {