A React context-like implementation for functions

callstack-context.ts

const contextStore: any = {};

const prefix = '____FREIGHTHUB_CONTEXT_PROVIDER____';

export async function runInContext(
  callback: () => Promise<void>,
  context: any
) {
  const id = 'some-random-id';
  const rootFnName = `${prefix}${id}--end`;

  contextStore[id] = context;
  const caller = {
    [rootFnName]: callback,
  };
  await caller[rootFnName]();
  delete contextStore[id];
}

export function getContext() {
  const defaultStackTraceLimit = Error.stackTraceLimit;
  Error.stackTraceLimit = Infinity;
  const trace = new Error().stack;
  const contextId = (trace?.match(
    /____FREIGHTHUB_CONTEXT_PROVIDER____(.*?)--end/
  ) as RegExpMatchArray)[1];

  Error.stackTraceLimit = defaultStackTraceLimit;
  return contextStore[contextId];
}

const a = () => console.log(getContext());
const b = () => a();
const c = () => b();
const d = () => c();

runInContext(async () => d(), 'context value for this call stack');