Code style recommendations

Pay attention to ESLint warnings.
Module files and directories should be named in camelCase; if module has single important entity like class or function then this file should be named after it:

// src/foo/bar/someFeature.ts

export class SomeFeature {
    ...
}

export function someFunction(feature: SomeFeature) {
    ...
}

Avoid default exports if possible as they assign a new name to the imported symbol which makes renames trickier when refactoring.
Inline interface declarations and module imports block should have spaces inside braces, object literals should not:

import { SomeFeature, someFunction } from '../bar/someFeature';

const point: { x: number; y: number; } = {x: 42, y: 10};

export { point };

Don't use parenthesis around lambda function with a single parameter:

items.map(item => ...)

Use const keyword to declare variable by default instead of let if you are not intended to modify it.
Declare imports from libraries first, then imports from project other than current module directory, then modules from current directory:

import * as React 'react';
import classnames from 'classnames';

import { SomeFeature } from '../bar/someFeature';

import { Engine } from './core';
import { transformEngine } from './utilities';