headless-mermaid/test.js

A mermaid.js handler for server-side rendering.

const mermaid = require("."),
  fs = require("fs")

let config = {
    theme: "forest",
    sequence: {
      showSequenceNumbers: true,
    },
  },
  code = `
sequenceDiagram
Alice ->> Bob: Hello Bob, how are you?
Bob-->>John: How about you John?
Bob--x Alice: I am good thanks!
Bob-x John: I am good thanks!
Note right of John: Bob thinks a long<br/>long time, so long<br/>that the text does<br/>not fit on a row.

Bob-->Alice: Checking with John...
Alice->John: Yes... John, how are you?`

// Use catch/rejection for error handling
mermaid
  .execute(code, config)
  .then((svg) => {
    fs.writeFileSync("output.svg", svg)
  })
  .catch((error) => {
    console.log(error)
  })