Feature Request: mangle properties builtins option supports array

[cuixiping]

Bug report or Feature request?

Feature request

I want to mangle all non-builtin properties and a few built-in properties, and reserve most of built-in properties.
Currently I have no easy way to config the option, since I have to list every property names which need mangle or list every ones which need to be reserved.
It will be much easier to set option if there is a list with a few built-in properties to be reserved.

For example, I have 10 non-builtin property names and 10 builtin property names. My purpose is mangle the all 10 non-builtin property names and 1 builtin property names. An expected easier option is like this:

 mangle: {
    properties: {
      builtins: ['value'],  // only mangle this one builtin and all non-builtin property names
    },
  },

instead of current

 mangle: {
    properties: {
      builtins: true,
      reserved: ['width', 'height', 'target', 'name', 'id', 'style', 'parent', 'self', 'top'],  // all reserved builtins
    },
  },

or

 mangle: {
    properties: {
      builtins: true,
      regex: /^(value|foo|bar|hello|world|example|github|terser)$/,   // all non-builtin and a few builtins
    },
  },

Version

Latest

Complete CLI command or minify() options used

{
  module: true,
  compress: {},
  mangle: {
    properties: {
      builtins: ['value'],  // only boolean value is supported, so this is equals to `true`
    },
  },
  output: {
    beautify: true,
  },
  parse: {},
  rename: {},
}

terser input

class A {
  // non-builtin property names
  foo = 'foo';
  bar = 'bar';
  hello = 'hello';
  world = 'world';
  // builtin property names
  target = 1;
  width = 3;
  height = 4;
  value = 2;
}
new A();

terser output or error

new class {
    l="foo";
    o="bar";
    e="hello";
    a="world";
    h=1;
    r=3;
    t=4;
    w=2;
};

Expected result

new class {
    l="foo";   // non-builtin, mangled
    o="bar";   // non-builtin, mangled
    e="hello";   // non-builtin, mangled
    a="world";   // non-builtin, mangled

    target=1;     // builtin, reserved
    width=3;     // builtin, reserved
    height=4;     // builtin, reserved

    h=2;     // builtin, mangled
};