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how to export to json then re-import?

Hello Sir,

To save/export as JSON, I tried changing the save function to:

async save () {
    try {
      let blob = await this.cy.json(false, 'elements')
      if (window.navigator.msSaveBlob) {
        window.navigator.msSaveBlob(blob, `chart-${Date.now()}.json`)
      } else {
        let a = document.createElement('a')
        a.download = `chart-${Date.now()}.json`
        a.href = window.URL.createObjectURL(blob)
        a.click()
      }
    } catch (e) {
      console.log(e)
    }
  }

but I get an error about the createObjectURL:

TypeError: URL.createObjectURL: Argument 1 is not valid for any of the 1-argument overloads.
    save index.js:513
    _handleCommand index.js:359
    _loop2 cytoscape.cjs.js:10505
    trigger cytoscape.cjs.js:10517
    forEachEventObj cytoscape.cjs.js:10401
    trigger cytoscape.cjs.js:10475
    emit cytoscape.cjs.js:14157
    command index.js:59
    _initEvents index.js:62
    Toolbar index.js:32
    default index.js:140
    _initPlugin index.js:245
    _init index.js:43
    CyEditor index.js:36
    mounted cyeditor.js:38
    VueJS 11
    <anonymous> main.js:8
    js app.js:864
    __webpack_require__ app.js:724
    fn app.js:101
    1 app.js:1995
    __webpack_require__ app.js:724
    <anonymous> app.js:791
    <anonymous> app.js:794

How would I add export to JSON and import as JSON buttons?

Thank you

Add license

Hi,

It would be nice if you could add a license so code in this repository could be reused.
A lot of the code in this repository could be really useful to me, though I am currently not sure to what extend I can use it.

Thanks.

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