Fix exports

[parzhitsky]

Currently, all packages (xrange, @xrange/core, @xrange/func) support both default and assigned imports, which is good and all when it comes to exporting only xrange function itself:

import xrange from "{PACKAGE}"; // 🚧 only with `esModuleInterop: true`
import xrange from "{PACKAGE}/dist"; // 🚧 only with `esModuleInterop: true`
import xrange from "{PACKAGE}/dist/index"; // 🚧 only with `esModuleInterop: true`
import xrange from "{PACKAGE}/dist/xrange"; // 👍

// javascript
const xrange = require("{PACKAGE}"); // 👍
const xrange = require("{PACKAGE}/dist"); // 👍
const xrange = require("{PACKAGE}/dist/index"); // 👍
const xrange = require("{PACKAGE}/dist/xrange"); // 🚧 access through `xrange.default()`

But for type definitions the support is less convenient, especially when esModuleInterop is false:

import type { Predicate } from "@xrange/func"; // 🚧 only with `esModuleInterop: true`
import type { Predicate } from "@xrange/func/dist"; // 🚧 only with `esModuleInterop: true`
import type { Predicate } from "@xrange/func/dist/index"; // 🚧 only with `esModuleInterop: true`
import type { Predicate } from "@xrange/func/dist/xrange"; // 👍

// ❌ invalid syntax
import type { Predicate } = require("@xrange/func"); // ❌
import type { Predicate } = require("@xrange/func/dist"); // ❌
import type { Predicate } = require("@xrange/func/dist/index"); // ❌
import type { Predicate } = require("@xrange/func/dist/xrange"); // ❌

// ❌ invalid syntax
import { Predicate } = require("@xrange/func"); // ❌
import { Predicate } = require("@xrange/func/dist"); // ❌
import { Predicate } = require("@xrange/func/dist/index"); // ❌
import { Predicate } = require("@xrange/func/dist/xrange"); // ❌

Exporting types from separate files wouldn't help much:

// ❌ invalid syntax
import type Predicate = require("@xrange/func/dist/typings"); // ❌
import type Predicate = require("@xrange/func/dist/typings/predicate"); // ❌

// 🚧 not a type import
import Predicate = require("@xrange/func/dist/typings"); // 👍
import Predicate = require("@xrange/func/dist/typings/predicate"); // 🚧 verbose path

[parzhitsky]

Suggestion: microsoft/TypeScript#38866

Weird but working solution would be to make an assigned export of xrange, as well as named (not default!) export of each of the types, — all from src/index.ts; this would require using @ts-ignore instruction:

src/index.ts:

import xrange from "./xrange";

// @ts-ignore
export = xrange;

export { XRange } from "./typings/xrange";
export { Predicate, NextFactory } from "@xrange/core";

Make sure to re-export only type definitions: this will not be checked by TypeScript compiler

---

some/third-party/module.ts

import xrange = require("xrange"); // 👍
import xrange from "xrange"; // 🚧 only with `esModuleInterop: true`
import xrange, { Predicate, NextFactory } from "xrange"; // 🚧 only with `esModuleInterop: true`
import type { Predicate, NextFactory } from "xrange"; // 🚧 only with `esModuleInterop: true`

some/third-party/module.js

const xrange = require("xrange"); // 👍
const xrange = require("xrange").default; // ❌