dooman87

export function apiKey(state: ApiKeyState, action: BaseAction) : ApiKeyState {
    let newState: ApiKeyState;

    switch (action.type) {
        case 'ADD_API_KEY':
            newState = Object.assign({}, state);
            newState.data.apiKeys = [
                ...state.data.apiKeys,
                action.payload.Key
            ] as string[];

dooman87

export function apiKey(state: ApiKeyState, action: BaseAction) : ApiKeyState {
    //Assigning variable here.
    let newState: ApiKeyState = state;

    switch (action.type) {
        case 'ADD_API_KEY':
            newState = Object.assign({}, state);
            newState.data.apiKeys = [
                ...state.data.apiKeys,
                action.payload.Key

dooman87

private usedMb(): number {
    if (this.props.usedBytes != null) {
        return (this.props.usedBytes / (1024 * 1024));
    }

    //ERROR: TS2322:Type undefined is not assignable to type number.
    return undefined;
}

dooman87

private usedMb(): number | undefined {
    if (this.props.usedBytes != null) {
        return (this.props.usedBytes / (1024 * 1024));
    }

    return undefined;
}

dooman87

private formatUsedMb(): string {
    //ERROR: TS2531: Object is possibly undefined
    return this.usedMb().toFixed(0).toString();
}

dooman87

private usedMb(): number | undefined {
    if (this.props.usedBytes) {
        return (this.props.usedBytes / (1024 * 1024));
    }

    return undefined;
}

dooman87

export function isNumber(n: any): n is number {
    return typeof n === "number";
}

dooman87

private usedMb(): number | undefined {
    //Using type guard isNumber()
    return isNumber(this.props.usedBytes) ?
        (this.props.usedBytes / (1024 * 1024)) :
        undefined;
}

dooman87

interface Bird {
    fly();
    layEggs();
}

interface Fish {
    swim();
    layEggs();
}

dooman87

private formatUsed(): string {
    let usedMb = this.usedMb();

    return usedMb ? usedMb.toFixed(0).toString() : '';
}