graphile-build-pg/node8plus/utils.js.flow

Build a GraphQL schema by reflection over a PostgreSQL schema. Easy to customize since it's built with plugins on graphile-build

// @flow
export const parseTags = (str: string) => {
  return str.split(/\r?\n/).reduce(
    (prev, curr) => {
      if (prev.text !== "") {
        return { ...prev, text: `${prev.text}\n${curr}` };
      }
      const match = curr.match(/^@[a-zA-Z][a-zA-Z0-9_]*($|\s)/);
      if (!match) {
        return { ...prev, text: curr };
      }
      const key = match[0].slice(1).trim();
      const value = match[0] === curr ? true : curr.replace(match[0], "");
      return {
        ...prev,
        tags: {
          ...prev.tags,
          [key]: !Object.prototype.hasOwnProperty.call(prev.tags, key)
            ? value
            : Array.isArray(prev.tags[key])
            ? [...prev.tags[key], value]
            : [prev.tags[key], value],
        },
      };
    },
    {
      tags: {},
      text: "",
    }
  );
};