What is a Runway prompt for type narrowing?

It is a structured brief that tells Runway how to produce code generation output for ts/python. This starter version stresses first successful run with safe defaults and keeps "examples" in the instructions.

How do I customize this Runway code generation prompt?

Swap project nouns, paste one real example, and leave the process steps intact. The constraint "examples" should stay unless your brief truly changed.

Why use the starter angle for type narrowing?

Different angles solve different failures. Starter helps when ts/python need first successful run with safe defaults. It is not longer for its own sake — each line has a job.

Is this Runway prompt updated for 2026?

Yes. Pages follow our SEO Bible, refresh on a rolling schedule, and include current best practices for Runway models. Always verify facts before client delivery.

Runway prompt for code generation: Type Narrowing (Starter)

Runway · Code Generation · Starter

Duration: 4–8 seconds. Shot: lateral tracking.
Action: make invalid hard. Keep motion physically plausible.
Look: Functions, refactors, tests, and architecture sketches. Lighting stays motivated. Constraint: examples.
Continuity: same wardrobe, same time of day, no sudden prop changes.
Audio intent (if any): low pulse.
Audience: ts/python. Focus: first successful run with safe defaults.

Use this Runway code generation template when ts/python need type narrowing with the rule: examples. Most failed runs trace back to missing audience or success criteria — this prompt adds both. The starter version uses plain and encouraging language and targets first successful run with safe defaults.

When to use this prompt

Runway shines at code generation work when you state the observable outcome: make invalid hard. The Starter framing keeps first successful run with safe defaults visible while you edit. Pair it with a real sample from your portfolio for best results.

Why this prompt works

Repeats the hard constraint: examples.
Centers make invalid hard so success is observable.
Names a clear job so Runway does not wander into generic advice.
Locks the audience (ts/python) before style so tone stays honest.
Forces an output contract: headings, examples, and a final version.

How to use it in Runway

Functions, refactors, tests, and architecture sketches. Keep that context in the thread when you iterate. If the first answer is vague, reply with the constraint again: examples. Paste the prompt into Runway and replace bracketed details with your facts. Name the success metric aloud: make invalid hard. If the draft cannot pass it, do not polish prose yet. Generate two seeds or takes, then pick the clearer silhouette or motion.

Ask for a checklist ts/python would use. Then grade the draft against make invalid hard. For type narrowing in code generation, the failure mode is usually no example. This prompt blocks that by design — especially "examples". Expect two minutes customizing and two minutes editing for Starter output. Runway models still need your facts for type narrowing; they cannot invent metrics or brand rules. developers teams bookmark slug type-narrowing-starter when first successful run with safe defaults matters.

Step-by-step

Open Runway and paste the prompt block unchanged.
Replace placeholders with your project facts (ts/python, offer, timeline).
Confirm the constraint is still visible: examples.
If output is vague, ask Runway to restate assumptions as questions first.
Reply with one fix list, then regenerate the final version only.

Example output

Example clip brief: 6s type narrowing shot, motivated light, single camera move, subject action matches "make invalid hard", no wardrobe changes mid-clip.

Common mistakes

Using the Starter prompt but editing it into a vague one-liner.
Deleting "examples" to save space — that is usually the whole point.
Asking for type narrowing plus three other jobs in one message.

Expert notes

Runway users working on type narrowing in code generation should treat "examples" as non-negotiable. Functions, refactors, tests, and architecture sketches. When ts/python run the Starter variant, they usually care about first successful run with safe defaults more than length.

If video output feels generic, re-paste examples as the first follow-up message — do not rewrite the whole prompt.

Comparison / variations

Approach	When	Tweak
Bare request	You only need a spark	Write a type narrowing piece.
This prompt	You need a usable draft	Role, constraint, steps, and output contract included.
Plus examples	Voice must match yours	Paste 120 words of your writing or a still you like, then rerun in Runway.

Key takeaways

Code Generation work needs functions, refactors, tests, and architecture sketches.
State the job (make invalid hard) in one line before any style talk.
Compare against other Runway angles on the same use case before you standardize.
The Starter variant is for first successful run with safe defaults.
ts/python should recognize themselves in the first paragraph.

FAQ

What is a Runway prompt for type narrowing?: It is a structured brief that tells Runway how to produce code generation output for ts/python. This starter version stresses first successful run with safe defaults and keeps "examples" in the instructions.
How do I customize this Runway code generation prompt?: Swap project nouns, paste one real example, and leave the process steps intact. The constraint "examples" should stay unless your brief truly changed.
Why use the starter angle for type narrowing?: Different angles solve different failures. Starter helps when ts/python need first successful run with safe defaults. It is not longer for its own sake — each line has a job.
Is this Runway prompt updated for 2026?: Yes. Pages follow our SEO Bible, refresh on a rolling schedule, and include current best practices for Runway models. Always verify facts before client delivery.