size: number
[Symbol.iterator](): IterableIterator<GPUFeatureName>
entries(): IterableIterator<[GPUFeatureName, GPUFeatureName]>
forEach(callbackfn: () => void,thisArg?: any,): void
has(value: GPUFeatureName): boolean
keys(): IterableIterator<GPUFeatureName>
values(): IterableIterator<GPUFeatureName>