babel-core/lib/babel/transformation/transformers/other/strict.js

Turn ES6 code into readable vanilla ES5 with source maps

"use strict";

var _interopRequireWildcard = function (obj) { return obj && obj.__esModule ? obj : { "default": obj }; };

exports.Program = Program;
exports.FunctionExpression = FunctionExpression;
exports.ThisExpression = ThisExpression;
exports.CallExpression = CallExpression;
exports.__esModule = true;

var messages = _interopRequireWildcard(require("../../../messages"));

var t = _interopRequireWildcard(require("../../../types"));

function Program(program, parent, scope, file) {
  var first = program.body[0];
  if (t.isExpressionStatement(first) && t.isLiteral(first.expression, { value: "use strict" })) {
    file.set("existingStrictDirective", program.body.shift());
  }
}

function FunctionExpression() {
  this.skip();
}

exports.FunctionDeclaration = FunctionExpression;
exports.Class = FunctionExpression;

function ThisExpression() {
  return t.identifier("undefined");
}

function CallExpression(node, parent, scope, file) {
  if (t.isIdentifier(node.callee, { name: "eval" })) {
    throw file.errorWithNode(node, messages.get("evalInStrictMode"));
  }
}