Sort Swagger YML

app.js

yaml = require("js-yaml");
fs = require("fs");

try {
  var doc = yaml.safeLoad(fs.readFileSync("./input.yml", "utf8"));
  let res = yaml.safeDump(doc, {
    styles: {
      "!!null": "canonical" // dump null as ~
    },
    lineWidth: 120,
    sortKeys: function(a, b) {
      const sortOrder = [
        "swagger",
        "info",
        "host",
        "basePath",
        "schemes",
        "paths",
        "name",
        "type",
        "summary",
        "description"
      ];

      let index_a = sortOrder.indexOf(a);
      let index_b = sortOrder.indexOf(b);

      if (index_a > -1 && index_b > -1) {
        return index_a > index_b ? 1 : index_a < index_b ? -1 : 0;
      }

      if (index_a != -1 && index_b == -1) {
        return -1;
      }
      if (index_a == -1 && index_b != -1) {
        return 1;
      }

      return a > b ? 1 : a < b ? -1 : 0;
    }
  });

  console.log(res);
} catch (e) {
  console.log(e);
}