@wordpress/block-library/build/utils/get-transformed-metadata.js

Block library for the WordPress editor.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getTransformedMetadata = getTransformedMetadata;
var _blocks = require("@wordpress/blocks");
/**
 * WordPress dependencies
 */

/**
 * Transform the metadata attribute with only the values and bindings specified by each transform.
 * Returns `undefined` if the input metadata is falsy.
 *
 * @param {Object}   metadata         Original metadata attribute from the block that is being transformed.
 * @param {Object}   newBlockName     Name of the final block after the transformation.
 * @param {Function} bindingsCallback Optional callback to transform the `bindings` property object.
 * @return {Object|undefined} New metadata object only with the relevant properties.
 */
function getTransformedMetadata(metadata, newBlockName, bindingsCallback) {
  if (!metadata) {
    return;
  }
  const {
    supports
  } = (0, _blocks.getBlockType)(newBlockName);
  // Fixed until an opt-in mechanism is implemented.
  const BLOCK_BINDINGS_SUPPORTED_BLOCKS = ['core/paragraph', 'core/heading', 'core/image', 'core/button'];
  // The metadata properties that should be preserved after the transform.
  const transformSupportedProps = [];
  // If it support bindings, and there is a transform bindings callback, add the `id` and `bindings` properties.
  if (BLOCK_BINDINGS_SUPPORTED_BLOCKS.includes(newBlockName) && bindingsCallback) {
    transformSupportedProps.push('id', 'bindings');
  }
  // If it support block naming (true by default), add the `name` property.
  if (supports.renaming !== false) {
    transformSupportedProps.push('name');
  }

  // Return early if no supported properties.
  if (!transformSupportedProps.length) {
    return;
  }
  const newMetadata = Object.entries(metadata).reduce((obj, [prop, value]) => {
    // If prop is not supported, don't add it to the new metadata object.
    if (!transformSupportedProps.includes(prop)) {
      return obj;
    }
    obj[prop] = prop === 'bindings' ? bindingsCallback(value) : value;
    return obj;
  }, {});

  // Return undefined if object is empty.
  return Object.keys(newMetadata).length ? newMetadata : undefined;
}
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