readcolor.ts

const rgbToHex = (r, g, b) =>
    '#' + ((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1);

const nodes = figma.currentPage.findAll(node => node.type === "TEXT" && node.name.charAt(0) === "#");

nodes.forEach(node => {
  let nodeId = RegExp(/^#(.*)/).exec(node.name)[1]
  let aNode = <RectangleNode> figma.getNodeById(nodeId);
  
  if (aNode) {
    console.log("aNode");
    console.log(aNode.name);
    console.log(aNode.type);
    console.log(aNode.fillStyleId);
    console.log(aNode.fills[0].color);
  
    aNode.fills.forEach(fill => {
      console.log(fill.type);
      const { r, g, b } = aNode.fills[0].color;
      const hexColor = rgbToHex(r * 255, g * 255, b * 255);
      console.log(hexColor);
    })
  }
});

figma.closePlugin();