"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = minifyJs;

var _terser = _interopRequireDefault(require("terser"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

/** Minify JS with Terser */
function minifyJs(tree, options, terserOptions) {
  tree.match({
    tag: 'script'
  }, function (node) {
    var nodeAttrs = node.attrs || {};
    var mimeType = nodeAttrs.type || 'text/javascript';

    if (mimeType === 'text/javascript' || mimeType === 'application/javascript') {
      return processScriptNode(node, terserOptions);
    }

    return node;
  });
  tree.match({
    attrs: true
  }, function (node) {
    return processNodeWithOnAttrs(node, terserOptions);
  });
  return tree;
}

function processScriptNode(scriptNode, terserOptions) {
  var js = (scriptNode.content || []).join(' ').trim();

  if (!js) {
    return scriptNode;
  }

  var result = _terser["default"].minify(js, terserOptions);

  if (result.error) {
    throw new Error(result.error);
  }

  if (result.code === undefined) {
    return scriptNode;
  }

  scriptNode.content = [result.code];
  return scriptNode;
}

function processNodeWithOnAttrs(node, terserOptions) {
  var jsWrapperStart = 'function _(){';
  var jsWrapperEnd = '}';

  for (var _i = 0, _Object$keys = Object.keys(node.attrs || {}); _i < _Object$keys.length; _i++) {
    var attrName = _Object$keys[_i];

    if (attrName.search('on') !== 0) {
      continue;
    } // For example onclick="return false" is valid,
    // but "return false;" is invalid (error: 'return' outside of function)
    // Therefore the attribute's code should be wrapped inside function:
    // "function _(){return false;}"


    var wrappedJs = jsWrapperStart + node.attrs[attrName] + jsWrapperEnd;

    var wrappedMinifiedJs = _terser["default"].minify(wrappedJs, terserOptions).code;

    var minifiedJs = wrappedMinifiedJs.substring(jsWrapperStart.length, wrappedMinifiedJs.length - jsWrapperEnd.length);
    node.attrs[attrName] = minifiedJs;
  }

  return node;
}