AssetVariant

type AssetVariant = {
  bytes: number;
  createdAt?: string;
  height?: number;
  preset: VariantEntryPreset;
  rungs?: HlsRung[];
  sourceFrom?:   | VariantPreset
     | "upload"
     | "transform-route"
     | "hls-transcode"
     | "cdn-probe";
  url: string;
  width?: number;
};

Defined in: packages/asset-client/src/index.ts:244

Properties

bytes

bytes: number;

Defined in: packages/asset-client/src/index.ts:258

Byte size of the stored variant file.

---

createdAt?

optional createdAt?: string;

Defined in: packages/asset-client/src/index.ts:281

ISO timestamp this variant was written. Absent on pre-trace variants.

---

height?

optional height?: number;

Defined in: packages/asset-client/src/index.ts:256

Pixel height. Same caveat as width.

---

preset

preset: VariantEntryPreset;

Defined in: packages/asset-client/src/index.ts:250

What this entry IS. Usually a named preset; can also be a transform-<hash> cache artifact — see VariantEntryPreset before passing it to getAssetUrl.

---

rungs?

optional rungs?: HlsRung[];

Defined in: packages/asset-client/src/index.ts:298

preset: "hls" only — the ladder’s rungs, in MASTER ORDER.

The reason this exists: an entry that only says there is a ladder leaves a consumer that plans a composition exactly as blind as no entry at all, because the ceiling of a composition is its weakest ingredient and there is no upscale. Before this field the only way to learn a clip’s real rungs was to fetch the master playlist — or worse, download the asset.

rungs[0] is the rung every client OPENS on (RFC 8216 §6.3.4 for native HLS; hls.js with startLevel unset uses “the first level in the manifest”), so the order is a delivery fact — do not sort it in place.

Use hlsLadderAlignment rather than eyeballing segments: a ladder can be complete and still unable to adapt.

---

sourceFrom?

optional sourceFrom?:
  | VariantPreset
  | "upload"
  | "transform-route"
  | "hls-transcode"
  | "cdn-probe";

Defined in: packages/asset-client/src/index.ts:271

Where the bytes for this variant came from. Useful for quality traceability — a thumb with sourceFrom: "original" is the canonical case, while sourceFrom: "lg" means it was derived from an already-encoded WebP (slight quality compounding).

• "upload" → first-write at /assets/process. The bytes came straight from the client’s PUT.
• VariantPreset → regenerated from that preset’s variant.

Absent on variants written before the trace field existed.

---

url

url: string;

Defined in: packages/asset-client/src/index.ts:252

Public CDN URL of this variant.

---

width?

optional width?: number;

Defined in: packages/asset-client/src/index.ts:254

Pixel width. Absent for original-only assets where image processing was skipped, or for video presets.