How to change Brush hardness without changing it's size via batchplay

Photoshop
2

To reliably change just one settings, you need to set back the whole tool options descriptor like I’ve described here:

To save you some time:

// ... require batchPlay & executeAsModal

// Have your tool selected or select it via:
executeAsModal(() =>
  batchPlay([
      {
        _obj: "select",
        _target: {
          _ref: "paintbrushTool",
        },
        dontRecord: true,
      },
    ],{})
);

// Store current tool options
const toolOpt = batchPlay([
  {
    _obj: 'get',
    _target: [
      { _property: "currentToolOptions" },  
      { _ref: 'application', _enum: 'ordinal', _value: 'targetEnum' }
    ],
  },
], { synchronousExecution: true })[0].currentToolOptions

// Set new value
toolOpt.brush.hardness._value = 50

// Write it back to the tool options
executeAsModal(() => batchPlay([
  {
      _obj: 'set',
      _target: {
        _ref: [{ _ref: 'paintbrushTool'}],
      },
      to: toolOpt
    }
  ],{}))
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