Engine

Time, motion, music, reading and transitions, imported from @intentface-launch/core.

import { … } from "@intentface-launch/core". Everything is a pure function of the frame, so any frame renders alone.

Video and time

Tool	What it does
`defineVideo`	Declares a video: shots end to end, overlapped by their transitions, with audio, formats and variants.
`useFrame`	The current frame, counted from the enclosing shot or `Sequence` (`{ from: "ask" }` counts from another shot).
`useSeconds`	Seconds since the start of the enclosing shot or `Sequence`.
`useVideoInfo`	The video's fps, size, format on screen and variant, and `duration`: the length of the enclosing shot in frames.
`useVariant`	The variant on screen and its `data`.
`Sequence`	Shows its children for a range of frames, with the clock restarting at 0.
`waitFor`	Holds the frame until a promise settles (image decode, data load). Pass a label to name it in stall reports.
`withVariant`, `withFormat`	The video as one of its variants or formats.

Motion

Tool	What it does
`interpolate`	Maps a value through piecewise segments, eased per segment.
`progress`	0 to 1 over a duration from a start frame. The workhorse for reveals.
`ease`, `bezier`	Named easing curves, and CSS cubic-bezier easing.
`overshootEase`	An entrance that passes its target once and settles, landing on time.
`spring`, `springs`	A closed-form damped spring, and named presets.
`springTo`	A value that changes target many times, keeping its speed through each change. Also takes points.
`springEase`	A spring as an easing that still arrives when the key says.
`springVelocity`, `springToVelocity`	A spring's speed at a frame: what a move hands to the next shot at a cut.
`settleFrames`	Frames until a spring stays near its target: when the next beat can start.
`landed`	A spring-driven position that lands on whole pixels: fractional while it moves, the rounded target once within 0.2 px. Rounding every frame makes the slow tail step.
`springFeel`, `springsAt`	Springs as `{ duration, bounce }` in frames.
`motion`, `personalities`	One easing family, spring, duration and stagger per video: `premium`, `energetic`, `playful`.
`durations`, `staggers`	Named durations and staggers, scaled to the frame rate or a tempo.
`random`	Seeded random numbers, the same in every worker.
`lerp`	Linear interpolation.
`toOklch`, `mixColor`, `formatOklch`	Colours in OKLCH, mixed the short way round the hue.
`springColor`	`springTo` for a colour, in OKLCH. From or to a near neutral it moves straight in OKLab, so it never passes through other hues.

Music and sound

Tool	What it does
`tempo`	Musical time: `t.beats(16)` in frames. Pick a BPM whose beat is a whole number of frames.
`beatGrid`	Detected beats from `beats.json` as frames, for tracks that drift from their tempo.
`findBreaths`	Quiet stretches in a track, for the silence before a reveal.
`editBeats`	Beat times after an `audio.edit` replays passages.
`audioLevels`	Reads a levels file: `at`, `smooth`, `pulse`, `accumulate`, `phraseAt`. For things that move with the sound.

Text, captions and formats

Tool	What it does
`readingTime`	How long a text must hold to be read.
`readingTimeOnBeats`	The same, rounded up to whole beats.
`wordTimings`	The frame each word appears at, for kinetic type without a voice-over.
`lintText`	Flags headlines over 6 words and lines over 42 characters.
`declareText`	Tells `check` what text a canvas or WebGL stage paints, so it is checked like DOM text.
`resolveCaptions`, `cueAt`, `wrapLines`	Caption cues as frames, wrapped and kept from overlapping.
`clearArea`, `platformZones`	Where text can go in a vertical cut, clear of TikTok, Reels and Shorts UI (what `check` holds 9:16 text to).
`safeZone`, `SAFE_ZONES`	One rectangle for laying out a vertical cut that works on every app: `organic` (790 × 1200 at 1080 × 1920) or `ads` (660 × 980). Dated October 2026.

Transitions

import { transitions } from "@intentface-launch/core", set as a shot's transition.

Transition	What it does
`fade`	A plain cross-dissolve. Safe over 3D.
`blur`	Dissolve with the outgoing shot blurring away. The house transition.
`zoom`	The outgoing shot falls back while the next rises in front.
`push`	Both shots travel together, like a pan.
`whip`	A fast whip pan, blurred along the move. 12 to 18 frames.
`wipe`	A straight, feathered edge at any angle.
`iris`	A circle opening from a point.
`shape`	Any SVG shape (a star, the product's mark) growing from a point.
`clock`	A clock hand sweeping round.
`sweep`	A band of light crosses the frame and the cut happens under it.
`zoomInto`	Pushes into an element that becomes the next scene.
`matchCut`	Places the incoming element where the outgoing one was, then springs it home at the speed it had.
`displace`	Dissolve through a liquid distortion.
`luma`	The next shot appears through noise, darkest first, like ink.
`chromatic`	A glitchy RGB split. 12 to 20 frames.
`honest`	A short dissolve where the edit skips time, so a slow result does not look instant.
`wipeMask`, `circleMask`, `clockMask`	The same reveals as CSS masks, for any layer.

Capture scripts and config

Tool	What it does
`defineCapture`	From `@intentface-launch/core/capture`: a script that drives the running product, frame-stepped, with snapshots and marks.
`secret`	An API key or demo login from the environment or the env file `secrets` names. Never printed, and replaced in snapshots and manifests.
`defineConfig`	From `@intentface-launch/core/config`: `launch.config.ts`, with the product, linked products, secrets and check thresholds.