gistfile1.txt

console.log(createBoard(10, 15).board);

function createBoard(size, mines) {
    let container = {
        status: undefined,
        revealed: 0,
        size,
        mines,
        board: new Array(size).fill({})
            .map(i => new Array(size).fill({}).map(o => ({
                cell: 0,
                show: false
            })))
    }

    while (mines > 0) {
        let x = Math.floor(Math.random() * size)
        let y = Math.floor(Math.random() * size)
        if (container.board[x][y] == "-1")
            continue
        container.board[x][y].cell = "-1";
        getNearby(container, x, y, (cell) => cell.cell != -1)
            .forEach(pos => pos.cell.cell++)
        mines--
    }
    return container;
}

function getNearby(container, x, y, filter) {
    let nearBy = [];
    for (let a = x - 1; a < x + 2; a++) {
        for (let b = y - 1; b < y + 2; b++) {
            if (container.board[a]) {
                let cell = container.board[a][b]
                if (cell && !(a == x && b == y) && filter(cell))
                    nearBy.push({ x: a, y: b, cell });
            }

        }
    }
    return nearBy;
}