Scripts to export GitHub issue labels from one repository and import them to another repository.

github-labels-export.js

/**
 * The array of issues is copied to your clipboard. Paste it somewhere before you copy the `github-labels-import.js` file content.
 *
 * Run this script on the https://github.com/OWNER/REPO/labels page.
 */
const convertRgbaToHex = (rgba) => {
  // Match the values in the parentheses
  const match = rgba.match(/rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+(?:\.\d+)?))?\)/);
  
  if (!match) return;
  
  // Extract the red, green, and blue values from the match
  let [, r, g, b] = match.map(Number);
  
  // Convert the values to hexadecimals and return the result
  return `#${((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1)}`;
};

const collectLabels = () => {
    const labelList = document.querySelector(".js-label-list");
    const labelRows = [...labelList.children];
    const labels = labelRows.map(labelRow => {
        const labelRowColumns = [...labelRow.children];
        // console.log(labelRow)
        const name = labelRowColumns.at(0).querySelector("span").textContent;
        const color = convertRgbaToHex(window.getComputedStyle(labelRowColumns.at(0).querySelector("a")).backgroundColor);
        const description = labelRowColumns.at(1).querySelector("span").textContent;

        return {
            name,
            color,
            description,
        };
    });
    return labels;
};

copy(collectLabels());

github-labels-import.js

/**
 * CAUTION: This deletes all existing labels.
 *
 * Run this script on the https://github.com/OWNER/REPO/labels page.
 */

// Deleting a label shows a confirmation dialog. We silence that temporarily.
const originalConfirm = window.confirm;
window.confirm = () => true;

const sleep = ms => new Promise(r => setTimeout(r, ms));

const deleteAllExistingLabels = async () => {
    const labelList = document.querySelector(".js-label-list");
    const labelRows = [...labelList.children];
    for (let labelRow of labelRows) {
        const labelRowColumns = [...labelRow.children];
        const editAndDeleteColumn = labelRowColumns.at(3);
        const deleteForm = editAndDeleteColumn.querySelector("form.js-delete-label");
        deleteForm.querySelector("button").click();
        await sleep(1500);
    }
    window.confirm = originalConfirm;
};

const importLabels = async () => {
    const labelsToImportString = window.prompt("Paste your labels array.");
    const labelsToImport = JSON.parse(labelsToImportString).reverse();
    for (let label of labelsToImport) {
        document.querySelector( '.js-new-label-name-input' ).value = label.name;
        document.querySelector( '.js-new-label-description-input' ).value = label.description;
        document.querySelector( '.js-new-label-color-input' ).value = label.color;
        document.querySelector( '.js-details-target ~ .btn-primary' ).disabled = false;
        document.querySelector( '.js-details-target ~ .btn-primary' ).click();
        await sleep(1500);
    }
};

deleteAllExistingLabels()
    .then(importLabels)
    .then(() => { console.log("All labels imported."); });