ES6-style import declarations don't work in TypeScript

[TedDriggs]

Environment: Typescript@2.5.2

import ipaddr from 'ipaddr.js';

ipaddr.parse("1.2.3.4"); // error; cannot call function 'parse' of undefined

const ipaddr = require('ipaddr.js');

ipaddr.parse("1.2.3.4"); // works

The tsconfig.json used for this was:

{
    "compileOnSave": true,
    "compilerOptions": {
        "allowJs": true,
        "allowSyntheticDefaultImports": true,
        "module": "commonjs",
        "moduleResolution": "node",
        "target": "es2016",
        "strictNullChecks": true
    },
    "exclude": [
        "node_modules"
    ]
}

Mostly, I was surprised that the library isn't recognized as a module unless imported via require. This also makes declaring a .d.ts file more difficult; the one I'd started worked with the ES6-style import but not with the require declaration.

[whitequark]

I know basically nothing about post-2012 JavaScript. Help me out?

[TedDriggs]

I'm not 100% sure what's happening yet either; still investigating.

[mooyoul]

1. import module like this way:

import * as ipaddr from 'ipaddr.js';

2. declare module like below:

// this filename should have .d.ts extension
declare module 'ipaddr.js' {
  type IPVersion = "ipv4" |  "ipv6";

  interface IPAddr {
    type: () => IPVersion;
    octet: number[];
  }

  interface IPAddrModule {
    parse: (ip: string) => IPAddr
  }

  const module: IPAddrModule;
  export = module;
}

[raijinsetsu]

I opened #93 to get type definitions added to this project. Email me if you want a more complete definition than above.

[whitequark]

#93 should have fixed this.