ReactJS TS, Property 'match' does not exist on type 'Readonly<{children?:ReactNode}> & Readonly<MyProps>'

This is an open issue in type definition. https://github.com/DefinitelyTyped/DefinitelyTyped/issues/17355

Workaround

import { RouteProps } from 'react-router';
import React from 'react';

interface MyProps {
    api: Api
}

interface MyState {
    someString: string,
    loading: boolean
}

class MyComponent extends React.Component<Props & RouteProps, State> // Pay attention here.
{
  // your code...
}

ref: https://github.com/DefinitelyTyped/DefinitelyTyped/issues/17355#issuecomment-336022780

Try to add RouteComponentProps inteface to your props. Change:

export class MyComponent extends React.Component<MyProps, MyState> {

to

export class MyComponent extends React.Component<MyProps & RouteComponentProps, MyState> {

I experienced a similar issue and found the least type breaking fix is to locally cast the params as any.

someString: (this.props.match.params as any).someString