upgradeConfig not working

[phamtrantriem]

I tried to use Particle-Emitter for Pixi v8, but I can't use upgradeConfig function, the code bellow:
const emitter = new PIXI.particles.Emitter(app.stage, PIXI.particles.EmitterConfig.upgradeConfig(particleConfig, [texture]));
I got an error Cannot read properties of undefined (reading 'upgradeConfig')

when i directly use JSON export from the editor, i get this message
Cannot read properties of undefined (reading 'map')
{
"alpha": {
"start": 1,
"end": 0
},
"scale": {
"start": 0.1,
"end": 0.01,
"minimumScaleMultiplier": 1
},
"color": {
"start": "#e4f9ff",
"end": "#3fcbff"
},
"speed": {
"start": 200,
"end": 50,
"minimumSpeedMultiplier": 1
},
"acceleration": {
"x": 0,
"y": 0
},
"maxSpeed": 0,
"startRotation": {
"min": 0,
"max": 360
},
"noRotation": false,
"rotationSpeed": {
"min": 0,
"max": 0
},
"lifetime": {
"min": 0.2,
"max": 0.8
},
"blendMode": "normal",
"frequency": 0.001,
"emitterLifetime": -1,
"maxParticles": 500,
"pos": {
"x": 0,
"y": 0
},
"addAtBack": false,
"spawnType": "circle",
"spawnCircle": {
"x": 0,
"y": 0,
"r": 0
}
}

[andrewstart]

EmitterConfig is not a class/namespace, PIXI.particles.upgradeConfig() should be the method you call.