minimal htmlOutputTemplate configuration

file.html

<p>hello, world</p>

Gruntfile.js

module.exports = function (grunt) {
  grunt.initConfig({
    ts: {
      'custom-template': {
        html: ['file.html'],
        src: ['.'],
        options: {
          compile: false,
          htmlOutputTemplate: 'export default \'<%= content %>\'',
        }
      }
    }
  });

  grunt.loadNpmTasks('grunt-ts');
};

package.json

{
  "dependencies": {
    "grunt": "^1.0.1",
    "grunt-ts": "^5.5.1"
  }
}