Alternative to https://dev.to/ninjah187/advanced-typescript-s-capabilities-in-real-life-scenario-593l

meteo-typed-metrics.ts

interface Metric {
    timestamp: Date;
    temperature: number;
    pressure: number;
    humidity: number;
    rain: number;
    sun: number;
    windDirection: number;
    windVelocity: number;
    dew: number;
}

type Diff<T, U> = T extends U ? never : T;

type MetricParam = Diff<keyof Metric, "timestamp">;

const metricValues: { [K in MetricParam]: number } = {
    temperature: 1,
    pressure: 2,
    humidity: 8,
    rain: 16,
    sun: 32,
    windDirection: 64,
    windVelocity: 128,
    dew: 256
};

// An alternative way to implement it is using a sorted list:
// const metricParams: MetricParam[] = ["temperature", "pressure", ...]

async function fetchMetrics<Param extends MetricParam>(
    stationId: number,
    metrics: Param[]
): Promise<Pick<Metric, Param>[]> {
    return []; // Placeholder
}

async function main() {
    const metrics = await fetchMetrics(1, ["temperature", "pressure"]);
    metrics.forEach(metric => {
        console.log(metric.temperature, metric.pressure);
        // console.log(metric.sun) // Error
    });
}