typed-utilities/src/scripts/codegen.ts

Strongly typed general purpose utilities

import { range } from "../range";

const genAsyncResultJoinType = (k: number): string => {
  const t = range(k).map((k) => `V${k + 1}`);
  return `${
    k === 0
      ? ``
      : `<${t.join(`, `)}>(values: readonly [${t
          .map((t) => `AsyncResult<${t}>`)
          .join(`, `)}]): AsyncResult<[${t.join(`, `)}], AggregateError>;`
  }`;
};

const genAsyncResultJoinTypes = (n: number): string =>
  [
    `type Join = {`,
    ...range(n + 1).map((k) => `  ${genAsyncResultJoinType(k)}`),
    `<V>(values: readonly AsyncResult<V>[]): AsyncResult<V[], AggregateError>;`,
    `};`,
  ].join(`\n`);

const genResolveAllType = (k: number): string => {
  const t = range(k).map((k) => `T${k + 1}`);
  return `${k === 0 ? `` : `<${t.join(`, `)}>`}(values: readonly [${t
    .map((t) => `Promise<${t}>`)
    .join(`, `)}]): Promise<[${t}]>;`;
};

const genResolveAllTypes = (n: number): string =>
  [
    `type ResolveAll = {`,
    ...range(n + 1).map((k) => `  ${genResolveAllType(k)}`),
    `};`,
  ].join(`\n`);

if (require.main === module) {
  console.log(`------- resolveAll --------`);
  console.log(genResolveAllTypes(20));

  console.log(`---------- Join -----------`);
  console.log(genAsyncResultJoinTypes(20));
}