Code for creating test list items for demos etc.

test-list-items.ts

  private createListItem() : void {

    this.context.spHttpClient.post(`https://TENANT.sharepoint.com/_api/web/lists/GetByTitle('Opportunities')?$select=ListItemEntityTypeFullName`, SPHttpClient.configurations.v1, {
      method: 'get',
      headers: new Headers({
          'Accept': 'application/json',
          'Content-Type': 'application/json'
      })
    }).then(result => {
      result.json().then(type => {
        
        function randomInteger(min, max) {
          return Math.floor(Math.random() * (max - min + 1)) + min;
        }

        let regions = ["North America", "South America", "APAC", "EMEA"];

        //Half-assed way to get a realistic distribution
        let stages = ["Lead", "Lead", "Lead", "Lead", "Lead", "Lead", "Lead", "Lead",
                      "Qualify", "Qualify", "Qualify", "Qualify", "Qualify", 
                      "Solution","Solution","Solution", 
                      "Proposal", "Proposal", 
                      "Finalize"];

        function getOppSize(revenue:number) : string {
          if(revenue < 450000) {
            return "Small";
          } else if(revenue > 800000) {
            return "Large";
          } else {
            return "Medium";
          }
        }
      
        //Generate some dummy data
        var region = regions[randomInteger(0, regions.length-1)];
        let revenue = randomInteger(10000, 1000000);
        let partnerDriven = Math.random() > 0.65;
        let salesStage = stages[randomInteger(0, stages.length-1)];
        let opportunitySize = getOppSize(revenue);

        let body:string = JSON.stringify({
          Title: "Opportunity " + randomInteger(1, 10000000),
          Region: region,
          EstimatedDealSize: revenue,
          PartnerDriven: partnerDriven,
          SalesStage: salesStage,
          OpportunitySize: opportunitySize
        });

        this.context.spHttpClient.fetch(`https://TENANT.sharepoint.com/_api/web/lists/GetByTitle('Opportunities')/items`, SPHttpClient.configurations.v1, {
          method: 'post',
          headers: new Headers({
              'Accept': 'application/json',
              'Content-Type': 'application/json',
              'Content-Length': body.length.toString()
          }),
          body: body
        }).then(result => {
          result.json().then(json => {
            this.createListItem();
          });
        });
      });
    });
    
  }