Use Event in microbit

let message = "testing";
let charList = "abcdefghijklmnopqrstuvwxyz";
const morseMap: { [name: string]: string } = {
    a: "._",
    b: "_...",
    c: "_._.",
    d: "_..",
    e: ".",
    f: ".._.",
    g: "__.",
    h: "....",
    i: "..",
    j: ".___",
    k: "_._",
    l: "._..",
    m: "__",
    n: "_.",
    o: "___",
    p: ".__.",
    q: "__._",
    r: "._.",
    s: "...",
    t: "_",
    u: ".._",
    v: "..._",
    w: ".__",
    x: "_.._",
    y: "_.__",
    z: "__.."
}
let morseMapInverse: { [name: string]: string } = {};

charList.split("").forEach(function (c, i) {
    morseMapInverse[morseMap[c]] = c;
});

morseMapInverse["-"] = " ";

let dot = images.createImage(`
    . . . . .
    . . # . .
    . # # # .
    . . # . .
    . . . . .
    `);

let dash = images.createImage(`
    . . . . .
    . . . . .
    # # # # #
    . . . . .
    . . . . .
    `);

let clear = images.createImage(`
    . . . . .
    . . . . .
    . . . . .
    . . . . .
    . . . . .
    `);

let timings: number[] = [];


control.onEvent(1, 1, function () {
    timings.push(input.runningTime());
    led.toggle(0, 0);
});
control.onEvent(1, 2, function () {
    timings.push(input.runningTime());
    led.toggle(0, 0);
});

function decode(): string {
    let morse = "";
    let t = 0;
    let on = false;
    timings.forEach(function (value: number, index: number) {
        if (t == 0) {
            t = value;
        } else {
            let deltaT = value - t;
            t = value;
            if (deltaT < 0) {
                led.toggleAll();
            }
            if (index % 2 == 1) {
                if (deltaT < 250) {
                    morse = morse + ".";
                } else {
                    morse = morse + "_";
                }
            } else {
                if (deltaT > 500) {
                    morse = morse + "-";
                }
            }
        }
        on = !on;
    });
    let result = "";
    morse.split("-").forEach(function (value: string, index: number) {
        if (morseMapInverse[value] != undefined) {
            result = result + morseMapInverse[value];
        } else {
            result = result + "#";
        }
    })
    return result;
}

input.onButtonPressed(Button.B, function () {
    basic.showString(decode());
    timings = [];
})
basic.forever(function () {

    /*message.split("").forEach(function (char, index) {
        basic.showString(char);
        if (char == " ") {
            basic.pause(3000);
        } else {
            morseMap[char].split("").forEach(function (s, i) {
                if (s == ".") {
                    dot.showImage(0);
                    basic.pause(1000);
                    clear.showImage(0);
                } else {
                    dash.showImage(0);
                    basic.pause(1000);
                    clear.showImage(0);
                }
            });
        }
    });
    basic.pause(5000);
    */
})