fix: single char export star

Makefile

@@ -1,5 +1,5 @@
-WASM2WAT := ../wabt/bin/wasm2wat
-WASM_OPT := ../binaryen/bin/wasm-opt
+WASM2WAT ?= ../wabt/bin/wasm2wat
+WASM_OPT ?= ../binaryen/bin/wasm-opt
 
 .PHONY: optimize clean
 
@@ -12,5 +12,8 @@ lib/lexer.wasm: include-wasm/cjs-module-lexer.h src/lexer.c | lib/
 lib/:
 	@mkdir -p $@
 
+optimize: lib/lexer.wasm
+	$(WASM_OPT) -Oz --low-memory-unused --enable-bulk-memory --strip-debug lib/lexer.wasm -o lib/lexer.wasm
+
 clean:
 	$(RM) lib/*

build/wasm.js

@@ -2,7 +2,7 @@
 
 const WASM_BUILDER_CONTAINER = 'ghcr.io/nodejs/wasm-builder@sha256:975f391d907e42a75b8c72eb77c782181e941608687d4d8694c3e9df415a0970' // v0.0.9
 
-const WASM_OPT = './wasm-opt'
+const WASM_OPT = process.env.WASM_OPT || './wasm-opt'
 
 const { execSync } = require('node:child_process')
 const { writeFileSync, readFileSync, existsSync, mkdirSync } = require('node:fs')

lexer.js

@@ -137,8 +137,10 @@ function parseSource (cjsSource) {
               pos += 4;
             if (source.charCodeAt(pos) === 40/*(*/) {
               openTokenPosStack[openTokenDepth++] = lastTokenPos;
-              if (source.charCodeAt(++pos) === 114/*r*/)
+              if (source.charCodeAt(pos + 1) === 114/*r*/) {
+                pos++;
                 tryParseRequire(ExportStar);
+              }
             }
           }
           lastTokenPos = pos;