index.js

"use strict";

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

var _t = require("@babel/types");

const {
  callExpression,
  identifier,
  isIdentifier,
  isSpreadElement,
  memberExpression,
  optionalCallExpression,
  optionalMemberExpression
} = _t;

function optimiseCallExpression(callee, thisNode, args, optional) {
  if (args.length === 1 && isSpreadElement(args[0]) && isIdentifier(args[0].argument, {
    name: "arguments"
  })) {
    if (optional) {
      return optionalCallExpression(optionalMemberExpression(callee, identifier("apply"), false, true), [thisNode, args[0].argument], false);
    }

    return callExpression(memberExpression(callee, identifier("apply")), [thisNode, args[0].argument]);
  } else {
    if (optional) {
      return optionalCallExpression(optionalMemberExpression(callee, identifier("call"), false, true), [thisNode, ...args], false);
    }

    return callExpression(memberExpression(callee, identifier("call")), [thisNode, ...args]);
  }
}