v0.15.12

• Fix minifier correctness bug with single-use substitutions (#2619)

  When minification is enabled, esbuild will attempt to eliminate variables that are only used once in certain cases. For example, esbuild minifies this code:

  function getEmailForUser(name) {
    let users = db.table('users');
    let user = users.find({ name });
    let email = user?.get('email');
    return email;
  }

  into this code:

  function getEmailForUser(e){return db.table("users").find({name:e})?.get("email")}

  However, this transformation had a bug where esbuild did not correctly consider the "read" part of binary read-modify-write assignment operators. For example, it's incorrect to minify the following code into bar += fn() because the call to fn() might modify bar:

  const foo = fn();
  bar += foo;

  In addition to fixing this correctness bug, this release also improves esbuild's output in the case where all values being skipped over are primitives:

  function toneMapLuminance(r, g, b) {
    let hdr = luminance(r, g, b)
    let decay = 1 / (1 + hdr)
    return 1 - decay
  }

  Previous releases of esbuild didn't substitute these single-use variables here, but esbuild will now minify this to the following code starting with this release:

  function toneMapLuminance(e,n,a){return 1-1/(1+luminance(e,n,a))}