const code = `
  console.log("Je suis triste sans couleur..");
  `;

const {createFlowTreeBuilder, createSVGRender} = js2flowchart;

const flowTreeBuilder = createFlowTreeBuilder(),
    svgRender = createSVGRender();

const flowTree = flowTreeBuilder.build(code),
    shapesTree = svgRender.buildShapesTree(flowTree);

const svg = shapesTree.print();

document.getElementById('svgImage').innerHTML = svg;