index.js

import core from '@actions/core';
import GitHubProject from 'github-project';

const run = async () => {
  try {
    const owner = core.getInput('owner');
    const number = Number(core.getInput('number'));
    const token = core.getInput('token');
    const iterationField = core.getInput('iteration-field'); // name of the iteration field
    const iterationType = core.getInput('iteration'); // last or current
    const newiterationType = core.getInput('new-iteration'); // current or next
    const statuses = core.getInput('statuses').split(',');
    const coreExclusedStatuses = core.getInput('excluded-statuses');
    const excludedStatuses = coreExclusedStatuses ? coreExclusedStatuses.split(',') : [];

    const project = new GitHubProject({ owner, number, token, fields: { iteration: iterationField } });

    const projectData = await project.getProperties();

    const lastIteration = projectData.fields.iteration.configuration.completedIterations[0];
    const currentIteration = projectData.fields.iteration.configuration.iterations[0];
    const nextIteration = projectData.fields.iteration.configuration.iterations[1];

    const iteration = iterationType === 'last' ? lastIteration : currentIteration;
    const newIteration = newiterationType === 'current' ? currentIteration : nextIteration;

    const items = await project.items.list();

    const filteredItems = items.filter(item => {
      // If item is not in the old iteration, return false.
      if (item.fields.iteration !== iteration.title) return false;
      // If excludedStatuses are supplied, use that. Otherwise, use statuses.
      if (excludedStatuses?.length) {
        // Move item only if its status _is not_ in the excluded statuses list.
        return !excludedStatuses.includes(item.fields.status);
      } else {
        // Move item only if its status _is_ in the statuses list.
        return statuses.includes(item.fields.status);
      }
    });

    await Promise.all(filteredItems.map(item => project.items.update(item.id, { iteration: newIteration.title })));
  } catch (error) {
    core.setFailed(error.message);
  }
};

run();