[BUG] Types do not resolve properly in an ESM TypeScript project

[sam-goodwin]

What is the bug?

The type declarations do not work when using ESM. I am getting the following error

Could not find a declaration file for module '@opensearch-project/opensearch'. '/Users/samgoodwin/workspaces/eventual-live/node_modules/.pnpm/@opensearch-project+opensearch@1.2.0/node_modules/@opensearch-project/opensearch/index.mjs' implicitly has an 'any' type.
  There are types at '/Users/samgoodwin/workspaces/eventual-live/packages/@eventual/core/node_modules/@opensearch-project/opensearch/index.d.ts', but this result could not be resolved when respecting package.json "exports". The '@opensearch-project/opensearch' library may need to update its package.json or typings.ts(7016)

Looks like there is a bug with the exports configuration for ESM support. This is the most important part:

There are types at /(my-workspace)/packages/@eventual/core/node_modules/@opensearch-project/opensearch/index.d.ts', but this result could not be resolved when respecting package.json "exports". The '@opensearch-project/opensearch library may need to update its package.json or typings.

How can one reproduce the bug?

Consume this package from a typescript project with the following tsconfig settings:

"module": "esnext",
"moduleResolution": "NodeNext",

What is the expected behavior?

There should be no error when importing this package in a TypeScript project using ESM.

What is your host/environment?

macOS 13.1 (22C65)

[thantos]

Typescript docs say that the "types" export condition should be before all others and that ESM and CJS should have their own .d.(?)ts files.

Current

"exports": {
    ".": {
      "require": "./index.js",
      "types": "./index.d.ts",
      "import": "./index.mjs"
    },
    "./aws": "./lib/aws/index.js",
    "./*": "./*"
  },

Expected

"exports": {
    ".": {
      "require": { 
          "types": "./index.d.ts",
          "default": "./index.js"
      },
      "import": { 
          "types": "./index.d.mts",
          "default": "./index.mjs"
      },
    },
    "./aws": "./lib/aws/index.js",
    "./*": "./*"
  },

[sam-goodwin]

My issue is caused by the broken latest tag in NPM #521