Function heading

test/unit/marked.test.js:517–530

(src)

          }],
          tokenizer: {
            heading(src) {
              if (src.startsWith(`# ${name}`)) {
                const token = {
                  type: 'heading',
                  raw: `# ${name}`,
                  text: `used ${name}`,
                  depth: 1,
                  tokens: [],
                };
                this.lexer.inline(token.text, token.tokens);
                return token;
              }
              return false;
            },
          },
          useNewRenderer: true,
          renderer: {