Get table of contents from markdown

getToc.js

const getToc = (source: string) =>
  source
    .split("\n")
    .map((line) => {
      const matches = line.match(/^#+[\s]+/);

      return matches
        ? {
            level: matches[0].trim().length,
            heading: line.replace(matches[0], "").trim(),
          }
        : false;
    })
    .filter(Boolean);

test.js

const markdown = `# Heading One\n## Heading Two\n ##Should not Match\n ## # Only the first parth should match \n ### Heading Three`;


const toc = getToc(markdown);

/*
Expecting
[
  {
    level: 1,
    heading: "Heading One"
  },
  {
    level: 2,
    heading: "Heading Two"
  },
  {
    level: 2,
    heading: "# Only the first parth should match"
  },
  {
    level: 3,
    heading: "Heading Three"
  }
];
*/