@wordpress/blocks/build-module/api/validation/logger.js

Block API for WordPress.

/**
 * @typedef LoggerItem
 * @property {Function}   log  Which logger recorded the message
 * @property {Array<any>} args White arguments were supplied to the logger
 */

export function createLogger() {
  /**
   * Creates a log handler with block validation prefix.
   *
   * @param {Function} logger Original logger function.
   *
   * @return {Function} Augmented logger function.
   */
  function createLogHandler(logger) {
    let log = (message, ...args) => logger('Block validation: ' + message, ...args);

    // In test environments, pre-process string substitutions to improve
    // readability of error messages. We'd prefer to avoid pulling in this
    // dependency in runtime environments, and it can be dropped by a combo
    // of Webpack env substitution + UglifyJS dead code elimination.
    if (process.env.NODE_ENV === 'test') {
      log = (...args) => logger(require('util').format(...args));
    }
    return log;
  }
  return {
    // eslint-disable-next-line no-console
    error: createLogHandler(console.error),
    // eslint-disable-next-line no-console
    warning: createLogHandler(console.warn),
    getItems() {
      return [];
    }
  };
}
export function createQueuedLogger() {
  /**
   * The list of enqueued log actions to print.
   *
   * @type {Array<LoggerItem>}
   */
  const queue = [];
  const logger = createLogger();
  return {
    error(...args) {
      queue.push({
        log: logger.error,
        args
      });
    },
    warning(...args) {
      queue.push({
        log: logger.warning,
        args
      });
    },
    getItems() {
      return queue;
    }
  };
}
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