index.ts

/// <reference path='typings/index.d.ts' />

import {promises as jsonld} from 'jsonld';
import {jsonLdObject, JsonLdResource} from './SampleObjects';

// this works fine, JS object literal passed directly to jsond.js
jsonld.expand({
    '@context': 'http://schema.org/',
    '@id': 'http://example.com/tpluscode',
    '@type': 'Person',
    givenName: 'Tomasz'
}).then(log);

// these two calls throw a compilation error
jsonld.expand(jsonLdObject).then(log);
jsonld.expand(new JsonLdResource()).then(log);

function log(expanded) {
    console.log(JSON.stringify(expanded, null, 2));
}

package.json

{
  "dependencies": {
    "jsonld": "^0.4.11"
  }
}

SampleObjects.ts

export var jsonLdObject = {
    '@context': 'http://schema.org/',
    '@id': 'http://example.com/tpluscode',
    '@type': 'Person',
    givenName: 'Tomasz'
};

export class JsonLdResource {
    get '@context'() {
        return 'http://schema.org';
    }

    get '@id'() {
        return 'http://example.com/tpluscode';
    }

    get '@type'() {
        return 'Person';
    }

    get givenName() {
        return 'Tomasz';
    }
}

tsconfig.json

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "removeComments": false,
    "noImplicitAny": false,
    "suppressImplicitAnyIndexErrors": false
  },
  "include": [
    "index.ts"
  ],
  "exclude": [
    "typings"
  ]
}

typings.json

{
  "dependencies": {
    "jsonld": "registry:npm/jsonld#0.4.0+20161023213320"
  }
}