Loading a CloudFormation yaml file with custom tags with js-yaml in node.js

load-cloudformation-jyaml.js

'use strict';

var fs = require('fs');
var yaml = require('js-yaml');

var inputStr = fs.readFileSync('../../out/aws-cloud-formation-template-1.template', {encoding: 'UTF-8'});

var CF_SCHEMA = yaml.Schema.create([
  new yaml.Type('!Ref',       { kind: 'scalar',   construct: function (data) { return { 'Ref': data }; } }),
  new yaml.Type('!Equals',    { kind: 'sequence', construct: function (data) { return { 'Fn::Equals': data }; } }),
  new yaml.Type('!Not',       { kind: 'sequence', construct: function (data) { return { 'Fn::Not': data }; } }),
  new yaml.Type('!Sub',       { kind: 'scalar',   construct: function (data) { return { 'Fn::Sub': data }; } }),
  new yaml.Type('!If',        { kind: 'sequence', construct: function (data) { return { 'Fn::If': data }; } }),
  new yaml.Type('!Join',      { kind: 'sequence', construct: function (data) { return { 'Fn::Join': data }; } }),
  new yaml.Type('!Select',    { kind: 'sequence', construct: function (data) { return { 'Fn::Select': data }; } }),
  new yaml.Type('!FindInMap', { kind: 'sequence', construct: function (data) { return { 'Fn::FindInMap': data }; } }),
  new yaml.Type('!GetAtt',    { kind: 'sequence', construct: function (data) { return { 'Fn::GetAtt': data }; } }),
  new yaml.Type('!GetAZs',    { kind: 'scalar',   construct: function (data) { return { 'Fn::GetAZs': data }; } }),
  new yaml.Type('!Base64',    { kind: 'mapping',  construct: function (data) { return { 'Fn::Base64': data }; } })
]);
var input = yaml.safeLoad(inputStr, { schema: CF_SCHEMA });

console.log(yaml.safeDump(input));