typescript.getTypescriptConfig.test.ts

import {getTypescriptConfig, makeDefaultTypescriptConfig} from '../src/typescript'
import * as path from 'path'

describe('getTypescriptConfig', () => {
    it(`returns default typescript configuration if the one provided doesn't exist`, () => {
        expect(
            getTypescriptConfig('/ciaone/my-folder'),
        ).toEqual(
            makeDefaultTypescriptConfig()
        )
    })

    it(`returns default typescript configuration if the one provided doesn't exist when tsConfigFileLocation provided`, () => {
        expect(
            getTypescriptConfig(process.cwd(), './tests/assets/tsconfigs/tsconfig.nonexistent.json'),
        ).toEqual(
            makeDefaultTypescriptConfig()
        )
    })

    it(`returns custom typescript configuration if tsConfigFileLocation provided`, () => {
        const tsconfigDir = path.join(process.cwd(), './tests/assets/tsconfigs/')
        expect(
            getTypescriptConfig(tsconfigDir, 'tsconfig.default.json'),
        ).toEqual({
            allowJs: true,
            configFilePath: undefined,
            lib: ["lib.es2015.d.ts"],
            moduleResolution: 2,
            outDir: path.join(tsconfigDir, '.build'),
            preserveConstEnums: true,
            rootDir: tsconfigDir,
            sourceMap: true,
            strictNullChecks: true,
            target: 1
        })
    })

    it(`throws error if configuration from tsConfigFileLocation is invalid`, () => {
        expect.assertions(1)
        try {
            getTypescriptConfig(process.cwd(), './tests/assets/tsconfigs/tsconfig.invalid.json')
        } catch (e) {
            expect(e.message).toBe('Invalid TSConfig file - is this file JSON format?')
        }
    })
})