Backslash not escaped by TransferState

[BlindDespair]

🐞 Bug report

Description

Having data like {"amount": "450\45g"} breaks the page when data is read from the TransferState script on JSON.parse(). It works great when it's received by the data.json though.

🔬 Minimal Reproduction

Pass {"amount": "450\45g"} to TransferState and load the page directly.

💻Your Environment

Angular Version:

Angular CLI: 11.2.4
Node: 14.16.0
OS: win32 x64

Angular: undefined
...
Ivy Workspace: Yes

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.1102.4 (cli-only)
@angular-devkit/core         11.2.4 (cli-only)
@angular-devkit/schematics   11.2.4 (cli-only)
@schematics/angular          11.2.4 (cli-only)
@schematics/update           0.1102.4 (cli-only)
typescript                   4.0.7

Scully Version:

"@scullyio/ng-lib": "^1.1.1",
"@scullyio/scully": "^1.1.1",

🔥 Exception or Error

JSON.parse fails on \4

[hunhavoc]

@SanderElias Can this be fixed by extending the special char escaping arrays? If yes, is that a safe approach?

I mean this list and it's escaped pair:

        '_~q~': "'",
        '_~b~': '`',
        '_~o~': '$',
        '_~s~': '/',
        '_~l~': '<',
        '_~g~': '>',
    };

If yes, I'm going to open a PR for it.

[SanderElias]

@hunhavoc That is what I tried initially, but it doesn't work. It needs a bit more. For testing, put a \ in the user-data in libs/scully/src/lib/testData/users-testdata.ts
Something like this would do the job:

  {
    id: 2,
    name: 'Ervin `Howell`',
    username: 'Anton\\ette',
    email: 'Shanna@melissa.tv',
    address: {
      street: 'Victor Plains',
      suite: 'Suite 879',
      city: 'Wisokyburgh',
      zipcode: '90566-7771',
      geo: {
        lat: '-43.9509',
        lng: '-34.4618',
      },
    },
    phone: '010-692-6593 x09125',
    website: 'anastasia.net',
    company: {
      name: 'Deckow-Crist',
      catchPhrase: 'Proactive \n```\nconsole.log("euhm")\n```\n didactic contingency',
      bs: 'synergize scalable supply-chains',
    },
  },

If you can find out a way to do that, and pass all the tests. I'm more than willing to merge a PR.