Property 'code' is missing in type '{ message: string; }' but required in type 'RollupWarning'.

[sliekens]

The TypeScript declaration for RollupWarning contains a code property that should be optional, but isn't.

• Rollup Version: 1.0.0
• Operating System (or Browser):
• Node Version: 11.2.0

How Do We Reproduce?

Start developing a plugin, using TypeScript.

package.json

{
    "name": "rollup-plugin-hmm",
    "devDependencies": {
        "rollup": "^1.0.0",
        "typescript": "^3.2.2"
    },
    "scripts": {
        "start": "tsc index.ts"
    }
}

index.ts

import { Plugin } from 'rollup';

export default function(): Plugin {
    return {
        name: 'hmm',
        load(id) {
            this.warn({ message: 'hmm' });
            return null;
        }
    };
}

Now do:

$ npm start

Expected Behavior

No errors

Actual Behavior

> tsc index.ts

index.ts:7:23 - error TS2345: Argument of type '{ message: string; }' is not assignable to parameter of type 'string | RollupWarning'.
  Property 'code' is missing in type '{ message: string; }' but required in type 'RollupWarning'.

7             this.warn({ message: 'hmm' });
                        ~~~~~~~~~~~~~~~~~~

  node_modules/rollup/dist/rollup.d.ts:15:2
    15  code: string;
        ~~~~
    'code' is declared here.


Found 1 error.

[lukastaegert]

Fix at #2635