prepack/lib/utils/babelhelpers.js

Execute a JS bundle, serialize global state and side effects to a snapshot that can be quickly restored.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getAsPropertyNameExpression = getAsPropertyNameExpression;
exports.memberExpressionHelper = memberExpressionHelper;
exports.optionalStringOfLocation = optionalStringOfLocation;
exports.stringOfLocation = stringOfLocation;
exports.protoExpression = exports.constructorExpression = exports.emptyExpression = exports.nullExpression = exports.voidExpression = void 0;

var t = _interopRequireWildcard(require("@babel/types"));

function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }

/**
 * Copyright (c) 2017-present, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 */
const voidExpression = t.unaryExpression("void", t.numericLiteral(0), true);
exports.voidExpression = voidExpression;
const nullExpression = t.nullLiteral();
exports.nullExpression = nullExpression;
const emptyExpression = t.identifier("__empty");
exports.emptyExpression = emptyExpression;
const constructorExpression = t.identifier("__constructor");
exports.constructorExpression = constructorExpression;
const protoExpression = t.identifier("__proto__");
exports.protoExpression = protoExpression;

function getAsPropertyNameExpression(key, canBeIdentifier = true) {
  // If key is a non-negative numeric string literal, parse it and set it as a numeric index instead.
  let index = Number.parseInt(key, 10);

  if (index >= 0 && index.toString() === key) {
    return t.numericLiteral(index);
  }

  if (canBeIdentifier) {
    // TODO #1020: revert this when Unicode identifiers are supported by all targetted JavaScript engines
    let keyIsAscii = /^[\u0000-\u007f]*$/.test(key);
    if (t.isValidIdentifier(key) && keyIsAscii) return t.identifier(key);
  }

  return t.stringLiteral(key);
}

function memberExpressionHelper(object, property) {
  let propertyExpression;
  let computed;

  if (typeof property === "string") {
    propertyExpression = getAsPropertyNameExpression(property);
    computed = !t.isIdentifier(propertyExpression);
  } else if (t.isStringLiteral(property)) {
    propertyExpression = getAsPropertyNameExpression(property.value);
    computed = !t.isIdentifier(propertyExpression);
  } else {
    propertyExpression = property;
    computed = true;
  }

  return t.memberExpression(object, propertyExpression, computed);
}

function optionalStringOfLocation(location) {
  // if we can't get a value, then it's likely that the source file was not given
  return location ? ` at location ${stringOfLocation(location)}` : "";
}

function stringOfLocation(location) {
  return `${location.source || "(unknown source file)"}[${location.start.line}:${location.start.column}]`;
}
//# sourceMappingURL=babelhelpers.js.map