v0.18.6

• Fix tree-shaking of classes with decorators (#3164)

  This release fixes a bug where esbuild incorrectly allowed tree-shaking on classes with decorators. Each decorator is a function call, so classes with decorators must never be tree-shaken. This bug was a regression that was unintentionally introduced in version 0.18.2 by the change that enabled tree-shaking of lowered private fields. Previously decorators were always lowered, and esbuild always considered the automatically-generated decorator code to be a side effect. But this is no longer the case now that esbuild analyzes side effects using the AST before lowering takes place. This bug was fixed by considering any decorator a side effect.

• Fix a minification bug involving function expressions (#3125)

  When minification is enabled, esbuild does limited inlining of const symbols at the top of a scope. This release fixes a bug where inlineable symbols were incorrectly removed assuming that they were inlined. They may not be inlined in cases where they were referenced by earlier constants in the body of a function expression. The declarations involved in these edge cases are now kept instead of being removed:

  // Original code
  {
    const fn = () => foo
    const foo = 123
    console.log(fn)
  }
  
  // Old output (with --minify-syntax)
  console.log((() => foo)());
  
  // New output (with --minify-syntax)
  {
    const fn = () => foo, foo = 123;
    console.log(fn);
  }