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function not implemented inside my TypeScript

john john 1,031 Reputation points
2022-06-07T10:14:31.7+00:00

I have the following TypeScript file inside our SharePoint sPFx:-

//

Microsoft 365 and Office | SharePoint Server | For business
Microsoft 365 and Office | SharePoint | For business | Windows
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  1. sadomovalex 3,636 Reputation points
    2022-06-07T14:24:34.903+00:00

    it looks like it fails on this line: 

    const placeholders = [...this.state.uploadPlaceholders];

    check whether this.state.uploadPlaceholders is array (try to output console.log(JSON.stringify(this.state.uploadPlaceholders))) or try to replace it by simpler expression without 3 dots notation

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