https://jsfiddle.net/ywb6ez3L/5/

matrix-rotate.ts

const matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9]
];

const rotateMatrix = (inputMatrix: Array<Array<Number>>, rotateBy: number) => {
  let outputMatrix = new Array(inputMatrix.length).fill([]);

  if (rotateBy === 0) {
    return inputMatrix;
  }

  outputMatrix = outputMatrix.map((row, index) => {
    const newRow = [];

    for (let counter = 0; counter < inputMatrix.length; counter++) {
      newRow.push(inputMatrix[(inputMatrix.length - 1) - counter][index])
    }

    return newRow;
  });

  return rotateMatrix(outputMatrix, rotateBy - 90);
}

console.log(rotateMatrix(matrix, 90));

console.log(rotateMatrix(matrix, 180));

console.log(rotateMatrix(matrix, 270));