node canvas auto wrap text by max width

node-canvas-fill-text-max-width.js

function fillText(ctx, text, x, y, maxWidth, spacing = 0){
  const lines = text.split('\n')
  let lineHeight = 0
  for (const line of lines) {
    if (!line) {
      y += lineHeight
      continue
    }
    let s = ''
    for (const char of line) {
      const { width, height } = measureText(ctx, s + char)
      if (width <= maxWidth) {
        s += char
      } else {
        ctx.fillText(s, x, y)
        lineHeight = height + spacing
        y += lineHeight + spacing
        s = char
      }
    }
    if (s) {
      const { height } = measureText(ctx, s)
      ctx.fillText(s, x, y)
      lineHeight = height + spacing
      y += lineHeight
    }
  }
}