Function createProto

libs/@local/harpc/client/typescript/src/utils.ts:5–42

(
  proto: T,
  readableProperties: ReadableProperties,
  writeableProperties?: WriteableProperties,
)

import type { MutableBuffer } from "./binary/index.js";

export const createProto = <
  T extends object,
  ReadableProperties extends Readonly<Record<string, unknown>>,
  WriteableProperties extends Readonly<Record<string, unknown>>,
>(
  proto: T,
  readableProperties: ReadableProperties,
  writeableProperties?: WriteableProperties,
): T & Readonly<ReadableProperties> & WriteableProperties => {
  const readablePropertyDescriptors = Record.map(
    readableProperties,
    (value): PropertyDescriptor => ({
      enumerable: true,
      configurable: false,
      writable: false,
      value,
    }),
  );

  const writeablePropertyDescriptors = Record.map(
    writeableProperties ?? {},
    (value): PropertyDescriptor => ({
      enumerable: true,
      configurable: false,
      writable: true,
      value,
    }),
  );

  return Object.create(
    proto,
    Record.union(
      readablePropertyDescriptors,
      writeablePropertyDescriptors,
      Function.untupled(Tuple.getFirst),
    ),
  ) as T & Readonly<ReadableProperties> & WriteableProperties;
};

/**
 * This is more strictly typed than necessary, but this allows us to give better type hints.