Spotlight One Line of Code — effect skill for code & terminal

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A highlight band sweeps onto the one line that matters while the rest of the file dims.

What it does

Built on Code Highlight Sweep by HeyGen (HyperFrames), Apache-2.0. The write-up and recipes below are varg's.

Other lines drop to ~35% opacity, the target line gets a soft accent band and full brightness; optional callout label at the right.

When: Explain the key line of an SDK example or the fix inside a long function.

Watch out: Do not dim to near-black; context must stay readable enough to orient.

Timing: Dim 0.3 s, band sweep 0.4 s power2.out, hold 1.5–2.5 s.

Also called: line highlight, code focus, dim context

In HyperFrames

npx hyperframes add code-highlight

In Remotion

const d = interpolate(frame,[0,9],[1,0.35],{extrapolateRight:'clamp'});
lines.map((l,i)=> <div style={{opacity: i===target?1:d, background: i===target?'rgba(56,139,253,0.18)':'none'}}>{l}</div>)

In CapCut

Duplicate the code clip; on the top copy Mask → Rectangle around the line; lower the bottom copy's Opacity to 40%.

Ready-made components

Where this comes from

Use when

Not for

Install

Example output

https://static.heygen.ai/hyperframes-oss/docs/images/catalog/blocks/code-highlight.mp4 — Preview of the Code Highlight Sweep component that builds this take (credit: Code Highlight Sweep · hyperframes, https://hyperframes.heygen.com/catalog/blocks/code-highlight)

More code & terminal skills

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