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

Awesome TS loader for webpack

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

spec(__filename, async function() {
    src('index.ts', `
        function sum(a: number, b: number) {
            return a + b;
        }

        sum('test', 1);
    `);

    tsconfig();

    let stats = await compile(webpackConfig());

    expectErrors(stats, 1, [
        `Argument of type '"test"' is not assignable to parameter of type 'number'`
    ]);

    checkOutput('index.js', `
        function sum(a, b) {
            return a + b;
        }

        sum('test', 1);
    `);
});