"CBC Goes With Everything" bot for Grid Game KotH

bot.js

const turn = api.turn();
const opening = "EEESSSEEESSEEEEEEEEEESSSEEESSSENEEENSNSSSSEEEEEEEEESSSEEESSEEEESE";
if(turn < opening.length*5) {
    switch (opening[turn%opening.length]) {
        case 'W':
            api.awayX();
            break;
        case 'N':
            api.awayY();
            break;
        case 'E':
            api.towardsX();
            break;
        case 'S':
            api.towardsY();
            break;
    }
}
if (turn === opening.length*5) {
    this.generator = (function* () {
        yield* [[0, 30], [1, 30], [2, 30]];

        for (let i = 0; i < 20; ++i) {
            yield* [[3], [2, 2]];
        }

        while (true) {
            for (let i = 0; i < 20; ++i) {
                yield* [[3, 2], [2]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[3, 2], [0]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[2, 2], [1]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[2, 2], [3]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[1, 2], [0]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[1, 2], [2]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[0, 2], [3]];
            }
            for (let i = 0; i < 20; ++i) {
                yield* [[0, 2], [1]];
            }
        }
    })();

    this.nextCall = turn;
}
if (turn === this.nextCall) {
    const [dir, delay = 1] = this.generator.next().value;
    [api.awayX, api.awayY, api.towardsX, api.towardsY][dir].bind(api)();
    this.nextCall += delay;
}