awesome-typescript-loader/src/__test__/skipLibCheck.ts

Awesome TS loader for webpack

import {
    src, webpackConfig, tsconfig,
    compile, expectErrors, spec
} from './utils';

spec(__filename, async function() {
    src('index.ts', `
        /// <reference path="./index.d.ts" />
        function sum(a: number, b: number) {
            return a + b;
        }

        sum(1, 1);
    `);

    src('index.d.ts', `
        function sum(a: number, b: number): number;
    `);

    tsconfig({
        skipLibCheck: true
    });

    let stats = await compile(webpackConfig());

    expectErrors(stats, 0);

    tsconfig({
        skipLibCheck: false
    });

    stats = await compile(webpackConfig());

    expectErrors(stats, 2, [
        `A 'declare' modifier is required for a top level declaration in a .d.ts file`,
        'Overload signatures must all be exported or non-exported'
    ]);
});