ts-transform-react-intl/src/aggregate.ts

Extracts string messages for translation from modules that use React Intl.

import { Messages, MessageDescriptor } from "./types";
import { Extractor } from "./transform";

/**
 * Aggregate messages, inline modify msgs
 *
 * @export
 * @param {Messages} msgs messages map to aggregate to
 * @returns {Extractor} extractor fn
 */
export function aggregate(msgs: Messages): Extractor {
  const defaultMessages = Object.keys(msgs).reduce(
    (all, k) => {
      all[msgs[k].defaultMessage] = msgs[k];
      return all;
    },
    {} as Messages
  );

  return (msgId: string, msg: MessageDescriptor) => {
    const { id, description, defaultMessage } = msg;
    // Throw an error if we have messages with the same ID but different
    // description & defaultMessage
    if (
      msgs[id] &&
      (msgs[id].description !== msg.description ||
        msgs[id].defaultMessage !== msg.defaultMessage)
    ) {
      console.error(`
--- [ERR] Translation key ${msgId} already exists ---
Description: "${msgs[id].description}" vs "${description}"
Default Message: "${msgs[id].defaultMessage}" vs "${defaultMessage}"
`);
      return process.exit(1);
    }

    // Warn if we have 2 messages with the same defaultMessage,
    // but different ID/description
    // For ex: Close can be Close Price or Close button
    if (
      defaultMessages[defaultMessage] &&
      (defaultMessages[defaultMessage].description !== msg.description ||
        defaultMessages[defaultMessage].id !== msg.id)
    ) {
      console.warn(`
--- [WARN]: Default Message ${defaultMessage} already exists ---
Description: "${
        defaultMessages[defaultMessage].description
      }" vs "${description}"
ID: "${defaultMessages[defaultMessage].id}" vs "${id}"
`);
    }
    msgs[msgId] = msg;
    defaultMessages[defaultMessage] = msg;
  };
}