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- /**
- * Copyright (c) 2018-present, Facebook, Inc. All rights reserved.
- *
- * This source code is licensed under the MIT license found in the
- * LICENSE file in the root directory of this source tree.
- *
- *
- */
- 'use strict';
- Object.defineProperty(exports, '__esModule', {
- value: true
- });
- exports.deserialize = deserialize;
- exports.serialize = serialize;
- exports.readFileSync = readFileSync;
- exports.writeFileSync = writeFileSync;
- var _fs;
- function _load_fs() {
- return (_fs = _interopRequireDefault(require('fs')));
- }
- var _v;
- function _load_v() {
- return (_v = _interopRequireDefault(require('v8')));
- }
- function _interopRequireDefault(obj) {
- return obj && obj.__esModule ? obj : {default: obj};
- }
- // JSON and V8 serializers are both stable when it comes to compatibility. The
- // current JSON specification is well defined in RFC 8259, and V8 ensures that
- // the versions are compatible by encoding the serialization version in the own
- // generated buffer.
- const JS_TYPE = '__$t__';
- const JS_VALUE = '__$v__';
- const JS_VF = '__$f__';
- function replacer(key, value) {
- // NaN cannot be in a switch statement, because NaN !== NaN.
- if (Number.isNaN(value)) {
- return {[JS_TYPE]: 'n'};
- }
- switch (value) {
- case undefined:
- return {[JS_TYPE]: 'u'};
- case +Infinity:
- return {[JS_TYPE]: '+'};
- case -Infinity:
- return {[JS_TYPE]: '-'};
- }
- switch (value && value.constructor) {
- case Date:
- return {[JS_TYPE]: 'd', [JS_VALUE]: value.getTime()};
- case RegExp:
- return {[JS_TYPE]: 'r', [JS_VALUE]: value.source, [JS_VF]: value.flags};
- case Set:
- return {[JS_TYPE]: 's', [JS_VALUE]: Array.from(value)};
- case Map:
- return {[JS_TYPE]: 'm', [JS_VALUE]: Array.from(value)};
- case Buffer:
- return {[JS_TYPE]: 'b', [JS_VALUE]: value.toString('latin1')};
- }
- return value;
- }
- function reviver(key, value) {
- if (!value || (typeof value !== 'object' && !value.hasOwnProperty(JS_TYPE))) {
- return value;
- }
- switch (value[JS_TYPE]) {
- case 'u':
- return undefined;
- case 'n':
- return NaN;
- case '+':
- return +Infinity;
- case '-':
- return -Infinity;
- case 'd':
- return new Date(value[JS_VALUE]);
- case 'r':
- return new RegExp(value[JS_VALUE], value[JS_VF]);
- case 's':
- return new Set(value[JS_VALUE]);
- case 'm':
- return new Map(value[JS_VALUE]);
- case 'b':
- return Buffer.from(value[JS_VALUE], 'latin1');
- }
- return value;
- }
- function jsonStringify(content) {
- // Not pretty, but the ES JSON spec says that "toJSON" will be called before
- // getting into your replacer, so we have to remove them beforehand. See
- // https://www.ecma-international.org/ecma-262/#sec-serializejsonproperty
- // section 2.b for more information.
- const dateToJSON = Date.prototype.toJSON;
- const bufferToJSON = Buffer.prototype.toJSON;
- /* eslint-disable no-extend-native */
- try {
- // $FlowFixMe: intentional removal of "toJSON" property.
- Date.prototype.toJSON = undefined;
- // $FlowFixMe: intentional removal of "toJSON" property.
- Buffer.prototype.toJSON = undefined;
- return JSON.stringify(content, replacer);
- } finally {
- // $FlowFixMe: intentional assignment of "toJSON" property.
- Date.prototype.toJSON = dateToJSON;
- // $FlowFixMe: intentional assignment of "toJSON" property.
- Buffer.prototype.toJSON = bufferToJSON;
- }
- /* eslint-enable no-extend-native */
- }
- function jsonParse(content) {
- return JSON.parse(content, reviver);
- }
- // In memory functions.
- function deserialize(buffer) {
- // $FlowFixMe - Node 8+ only
- return (_v || _load_v()).default.deserialize
- ? (_v || _load_v()).default.deserialize(buffer)
- : jsonParse(buffer.toString('utf8'));
- }
- function serialize(content) {
- // $FlowFixMe - Node 8+ only
- return (_v || _load_v()).default.serialize
- ? (_v || _load_v()).default.serialize(content)
- : Buffer.from(jsonStringify(content));
- }
- // Synchronous filesystem functions.
- function readFileSync(filePath) {
- // $FlowFixMe - Node 8+ only
- return (_v || _load_v()).default.deserialize
- ? (_v || _load_v()).default.deserialize(
- (_fs || _load_fs()).default.readFileSync(filePath)
- )
- : jsonParse((_fs || _load_fs()).default.readFileSync(filePath, 'utf8'));
- }
- function writeFileSync(filePath, content) {
- // $FlowFixMe - Node 8+ only
- return (_v || _load_v()).default.serialize
- ? (_fs || _load_fs()).default.writeFileSync(
- filePath,
- (_v || _load_v()).default.serialize(content)
- )
- : (_fs || _load_fs()).default.writeFileSync(
- filePath,
- jsonStringify(content),
- 'utf8'
- );
- }
- exports.default = {
- deserialize,
- readFileSync,
- serialize,
- writeFileSync
- };
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