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Filename : generateTypeDefinitions.js

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const definitions = require("../src/definitions");
const flatMap = require("array.prototype.flatmap");
const { typeSignature, mapProps, iterateProps, unique } = require("./util");

const stdout = process.stdout;

function params(fields) {
  return mapProps(fields).map(typeSignature).join(",");
}

function generate() {
  stdout.write(`
    // @flow
    /* eslint no-unused-vars: off */

    // THIS FILE IS AUTOGENERATED
    // see scripts/generateTypeDefinitions.js
  `);

  // generate union types
  const unionTypes = unique(
    flatMap(
      mapProps(definitions).filter((d) => d.unionType),
      (d) => d.unionType
    )
  );
  unionTypes.forEach((unionType) => {
    stdout.write(
      `type ${unionType} = ` +
        mapProps(definitions)
          .filter((d) => d.unionType && d.unionType.includes(unionType))
          .map((d) => d.name)
          .join("|") +
        ";\n\n"
    );
  });

  // generate the type definitions
  iterateProps(definitions, (typeDef) => {
    stdout.write(`type ${typeDef.name} = {
        ...BaseNode,
        type: "${typeDef.name}",
        ${params(typeDef.fields)}
      };\n\n`);
  });
}

generate();