Class GradientCondition

// Logs all the information inside gradient conditional format rules on a sheet.
// The below snippet assumes all colors have ColorType.RGB.
const sheet = SpreadsheetApp.getActiveSheet();
const rules = sheet.getConditionalFormatRules();
for (let i = 0; i < rules.length; i++) {
  const gradient = rules[i].getGradientCondition();

  const minColor = gradient.getMinColorObject().asRgbColor().asHexString();
  const minType = gradient.getMinType();
  const minValue = gradient.getMinValue();
  const midColor = gradient.getMidColorObject().asRgbColor().asHexString();
  const midType = gradient.getMidType();
  const midValue = gradient.getMidValue();
  const maxColor = gradient.getMaxColorObject().asRgbColor().asHexString();
  const maxType = gradient.getMaxType();
  const maxValue = gradient.getMaxValue();

  Logger.log(`The conditional format gradient information for rule ${i}:
    MinColor ${minColor}, MinType ${minType}, MinValue ${minValue},
    MidColor ${midColor}, MidType ${midType}, MidValue ${midValue},
    MaxColor ${maxColor}, MaxType ${maxType}, MaxValue ${maxValue}`);
}