@microsoft/sp-webpart-base/lib/utils/isWebPartData.js

SharePoint Framework support for building web parts

export function isWebPartData(contextOrWebPartData) {
    var assumedWebPartData = contextOrWebPartData;
    var assumedContext = contextOrWebPartData;
    // check all guaranteed properties of IWebPartData
    return (Boolean(typeof assumedWebPartData.dataVersion === 'string' &&
        typeof assumedWebPartData.id === 'string' &&
        typeof assumedWebPartData.instanceId === 'string' &&
        typeof assumedWebPartData.title === 'string') &&
        // sanity check context guaranteed properties
        Boolean(!assumedContext.domElement && !assumedContext.manifest && !assumedContext.displayMode));
}
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