Postman Helpers

1. Setup in Postman

Create a global variable in Postman called require. Provide a comma separated listed of packages you need e.g. graphql. It will load all the files from this repository which are in the list.

Add the following script (install.js) to the Pre-Request Script of your collection:

const reqs = pm.globals.get('require');
const pkgs = pm.globals.get('packages');
const installed = pm.globals.get('installedPackages');
let helpers = [];

if (pkgs && (reqs === installed)) {
  postman.setEnvironmentVariable("helpers", pkgs);
} else {
  const req = reqs.split(',')

  for (let i = 0; i < req.length; i++) {
    pm.sendRequest({
      async: false,
      url: `https://raw.githubusercontent.com/marten-cz/postman-libraries/main/${req[i]}.js`,
      method: 'GET'
    }, (err, res) => {
      if (!err) {
        helpers.push(`${req[i]}: ${res.text()}`);
        pm.globals.set('installedPackages', pm.globals.get('installedPackages', reqs));
        pm.globals.set('packages', `() => { return { ${helpers.join(', ')} }; }`);

        postman.setEnvironmentVariable("helpers", pm.globals.get('packages'));
      }
    });
  }
}

2. How to use

Evalute content of helpers variable. The methods are accessible under ().().

let helpers = eval(environment.helpers)();
console.log(helpers.graphql().isGraphql());