Symbol minification (#2695)

* minify

* Update renamer.zig

* --minify-whitespace

* Speed up minification a little

* handle private names

* 5% faster minification

* use helper function

* fix nested scope slots

* `bun build --minify` gets another +8% faster

* print semicolons afterwards

* print semicolon after checking error

* after all error checking

* Delete code for generating legacy bundes

* remove extra whitespace around if statements

* print space before import identifier

* Use `@constCast`

* Make `S.Local#decls` use `BabyList(Decl)`

* Add `fromSlice` helper to `BabyList`

* Remove unnecessary optional chains

* minify `undefined, true, false`

* Another @constCast

* Implement merge adjacent local var

* Support --minify in `bun build --transform`

* skip comments when counting character frequencies

* Don't wrap commonjs with --transform on (unless targeting bun)

* Support --minify in the runtime

* Fix edgecase with import * as

* don't infinite loop

* --trnasform shouldn't mess with require

* Only track comments when minifying

---------

Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/src/cli.zig b/src/cli.zig
index e5065fd79..61e236bad 100644
--- a/src/cli.zig
+++ b/src/cli.zig
@@ -165,6 +165,10 @@ pub const Arguments = struct {
         clap.parseParam("-l, --loader <STR>...             Parse files with .ext:loader, e.g. --loader .js:jsx. Valid loaders: jsx, js, json, tsx, ts, css") catch unreachable,
         clap.parseParam("-u, --origin <STR>                Rewrite import URLs to start with --origin. Default: \"\"") catch unreachable,
         clap.parseParam("-p, --port <STR>                  Port to serve bun's dev server on. Default: \"3000\"") catch unreachable,
+        clap.parseParam("--minify                          Minify (experimental)") catch unreachable,
+        clap.parseParam("--minify-syntax                   Minify syntax and inline data (experimental)") catch unreachable,
+        clap.parseParam("--minify-whitespace               Minify whitespace (experimental)") catch unreachable,
+        clap.parseParam("--minify-identifiers              Minify identifiers") catch unreachable,
         clap.parseParam("<POS>...                          ") catch unreachable,
     };
 
@@ -208,8 +212,6 @@ pub const Arguments = struct {
         clap.parseParam("--server-components        Enable React Server Components (experimental)") catch unreachable,
         clap.parseParam("--splitting                      Split up code!") catch unreachable,
         clap.parseParam("--transform                      Do not bundle") catch unreachable,
-        clap.parseParam("--minify-syntax                  Minify syntax and inline data (experimental)") catch unreachable,
-        clap.parseParam("--minify-whitespace              Minify whitespace (experimental)") catch unreachable,
     };
 
     // TODO: update test completions
@@ -476,10 +478,14 @@ pub const Arguments = struct {
         const production = false;
         var output_file: ?string = null;
 
+        const minify_flag = args.flag("--minify");
+        ctx.bundler_options.minify_syntax = minify_flag or args.flag("--minify-syntax");
+        ctx.bundler_options.minify_whitespace = minify_flag or args.flag("--minify-whitespace");
+        ctx.bundler_options.minify_identifiers = minify_flag or args.flag("--minify-identifiers");
+
         if (cmd == .BuildCommand) {
             ctx.bundler_options.transform_only = args.flag("--transform");
-            ctx.bundler_options.minify_syntax = args.flag("--minify-syntax");
-            ctx.bundler_options.minify_whitespace = args.flag("--minify-whitespace");
+
             if (args.option("--outdir")) |outdir| {
                 if (outdir.len > 0) {
                     ctx.bundler_options.outdir = outdir;
@@ -922,6 +928,7 @@ pub const Command = struct {
             transform_only: bool = false,
             minify_syntax: bool = false,
             minify_whitespace: bool = false,
+            minify_identifiers: bool = false,
         };
 
         const _ctx = Command.Context{