TypeScript. How to add a property to class method?

Vladimir — Wed, 25 Sep 2019 10:54:56 +0000

I have next code:


export const getPath = async (from: CurrencyTicker, to: CurrencyTicker): Promise<ExchangePair[]> => {
  const helper = new Helper(from, to);
  const path = await helper.calculatePath()

  return path;
}
getExchangePath.cached = withMemoryCache('exchange-path', CACHE_PAIR_COUNT, ms('5m'), getExchangePath);

It works fine, but how can I make same thing with Class?

Something like that

class Estimate {
  private readonly helper: Helper;

  constructor(currencyFrom: CurrencyTicker, currencyTo: CurrencyTicker) {
    this.helper = new Helper(currencyFrom, currencyTo);

    // next line throws TS error Property 'cached' does not exist on type '() => Promise<[string, string][]>'
    this.getExchangePath.cached = withMemoryCache('exchange-path', CACHE_PAIR_COUNT, ms('5m'), getExchangePath);
  }

  getPath = async (): Promise<ExchangePair[]> => {
    const path = await this.helper.calculatePath()

    return path;
  }
}

componentDidMount

Vladimir — Tue, 29 May 2018 12:40:49 +0000

What is behavior for componentDidMount? Should it be fired after all children mounted? If no, how can I run code, when all children of a component was mounted?

getSnapshotBeforeUpdate

Vladimir — Mon, 09 Apr 2018 15:15:08 +0000

It is allowed to use setState in the getSnapshotBeforeUpdate lifecycle?

DEV Community: Vladimir

TypeScript. How to add a property to class method?

componentDidMount

getSnapshotBeforeUpdate