How do I track down the root cause of this cryptic error?

[jcollum-nutrien]

Error:

 FAIL  src/handler.spec.ts
  ● Test suite failed to run

      x Expected '{', got 'type'
       ,-[/Users/justin.collum/Documents/work/foo/src/eventually.ts:3:1]
     1 | import { addMilliseconds } from 'date-fns';
     2 |
     3 | export type EventuallyOptions = {
       :        ^^^^
     4 |   totalAllowedTimeMs: number;
     5 |   retryDelayMs: number;
     6 | };
       `----


    Caused by:
        Syntax Error

      3 | export * from './helpers';
      4 | export * from './inner';
    > 5 | export * from './internal';
        |              ^
      6 | export * from './redis';
      7 | export * from './types';

But when I transpile internal there are no issues. The code that it appears to be hung up on is simple enough:

import { addMilliseconds } from 'date-fns';

export type EventuallyOptions = {
  totalAllowedTimeMs: number;
  retryDelayMs: number;
};

const defaultWaitTimeMs = 30000;
const defaultDelayTimeMs = 500;

export async function eventually<T = void>(
  expectation: () => Promise<T> | T,
  options: Partial<EventuallyOptions> = {}
) {
  const waitTime = options.totalAllowedTimeMs || defaultWaitTimeMs;
  const delay = options.retryDelayMs || defaultDelayTimeMs;
  const endTime = addMilliseconds(new Date(), waitTime);
  let error: unknown | null = null;

  while (endTime >= new Date()) {
    try {
      return await expectation();
    } catch (err) {
      error = err;
      await new Promise((resolve) => setTimeout(resolve, delay).unref());
    }
  }

  throw error;
}

So how do I troubleshoot this? Is date-fns the actual issue?

[kdy1]

You are parsing typescript file as ecmascript

[jcollum-nutrien]

I changed swcrc to

{
  "jsc": {
    "parser": {
      "syntax": "typescript",
      "tsx": false,
      "decorators": true,
      "dynamicImport": true
    },
    "transform": {
      "legacyDecorator": true,
      "decoratorMetadata": true
    },
    "target": "es2020",
    "keepClassNames": true
  },
  "module": {
    "type": "es6"
  }
}

and that helped.

[kdy1]

I think it's a bug that typescript is not enabled by default, without "syntax": "ecmascript". I assumed you have one in the .swcrc. Can you file an issue?

[jcollum-nutrien]

just to clarify, you think that it's defaulting to "syntax": "ecmascript" when it should be defaulting to "syntax": "typescript" ?

[kdy1]

No. It adjusts the default based on extension if .swcrc does not exist.

[jcollum-nutrien]

Extension of which file? 90% of the files in my repo are ts and I'm in the process of getting rid of all the js files.