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

Awesome TS loader for webpack

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

spec(__filename, async function() {
	const index = src(
		'index.ts',
		`
        export { default as sum } from './utils/sum'
    `
	)

	src(
		'utils/sum.ts',
		`
        export default function sum(a: number, b: number) {
            return a + b;
        }
    `
	)

	tsconfig({
		declarationDir: 'decl',
		declaration: true
	})

	const watcher = watch(webpackConfig())

	let stats = await watcher.wait()

	expectErrors(stats, 0)

	checkOutput(
		'../decl/index.d.ts',
		`
        export { default as sum } from './utils/sum'
    `
	)

	checkOutput(
		'../decl/utils/sum.d.ts',
		`
        export default function sum(a: number, b: number): number
    `
	)

	src(
		'utils/mul.ts',
		`
        export default function mul(a: number, b: number) {
            return a * b;
        }
    `
	)

	index.update(
		() => `
        export { default as sum } from './utils/sum'
        export { default as mul } from './utils/mul'
    `
	)

	await watcher.wait()

	checkOutput(
		'../decl/utils/mul.d.ts',
		`
        export default function mul(a: number, b: number): number
    `
	)

	checkOutput(
		'../decl/index.d.ts',
		`
        export { default as sum } from './utils/sum';
        export { default as mul } from './utils/mul';
    `
	)
})