MCPInstall

nullable-new-params

by remotion-devMedia & Creative

Fix newly added optional parameters, optional React props, and optional type/interface members in Remotion monorepo diffs by converting internal APIs to required nullable values and updating call sites. Use when a PR, review, or user asks to forbid new foo?: T / param?: T additions except for exported or documented public APIs where requiring the value would be breaking.

Installs
630
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/remotion-dev/remotion --skill nullable-new-params
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads nullable-new-params automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Nullable new params

Use this skill when a change added a new parameter or type member as optional. In internal Remotion code, new inputs must be required and nullable so every caller makes an explicit choice.

Rule

  • Internal contracts: write name: T | null, not name?: T.
  • Call sites must pass null explicitly when no value exists.
  • Implementation checks should prefer value === null / value !== null when null is the absence sentinel.
  • Do not use undefined as the absence sentinel for new internal APIs unless the surrounding local contract already standardizes on undefined.
  • The anti-pattern includes redundant shapes such as frozenFrame?: number | null; make it frozenFrame: number | null.

Public APIs are the exception. If the changed signature, props type, or options object is exported from a package public entrypoint or documented in packages/docs/docs, making the new field/argument required is a breaking change. Keep it optional or add a backwards-compatible overload/options path, then document/default it as appropriate.

Workflow

  1. Inspect the diff for newly added optional members or parameters:
bun .agents/skills/nullable-new-params/scripts/find-new-optional-params.ts

Useful variants:

bun .agents/skills/nullable-new-params/scripts/find-new-optional-params.ts origin/main...HEAD
bun .agents/skills/nullable-new-params/scripts/find-new-optional-params.ts --cached

  1. For each candidate, classify whether it is public:

    • Public: exported from a package entrypoint, included in package exports, or documented in packages/docs/docs.
    • Internal: local helpers, internal component props, cross-file monorepo helpers, test utilities, internal context data, and types not exposed through package entrypoints.
    • If unsure, grep package entrypoints and docs before changing API shape.

  2. For internal candidates, refactor the type from optional to required nullable:

type Before = {
  readonly frame?: number;
};

type After = {
  readonly frame: number | null;
};

For function parameters:

const before = (frame?: number) => {};
const after = (frame: number | null) => {};

  1. Update every caller/object literal to pass the value explicitly:

    • Use field: null when absent.
    • Preserve existing values with field: maybeValue ?? null only when undefined can still enter from surrounding code.
    • Avoid hiding the required choice behind defaults in destructuring.

  2. Update implementation logic:

    • Replace truthy checks when 0, '', or false are valid values.
    • Prefer value !== null over value for nullable numbers/strings/booleans.
    • When updating existing tests or fixtures, keep them explicit; do not make large fixtures Partial<T> only to dodge the new field.

  3. For public candidates, preserve backwards compatibility:

    • Keep the new field optional in the public type.
    • Resolve a concrete internal value at the boundary, usually with const internal = publicValue ?? null.
    • Keep internal downstream types required nullable.

  4. Verify:

    • Run the scanner again until only intentional public API exceptions remain.
    • Run focused tests or package builds for touched packages, for example bunx turbo run make --filter='<package-name>'.
    • If docs changed, follow the writing-docs skill.

Review checklist

  • No new internal ?: member or param?: parameter remains.
  • Every internal caller passes either a real value or null.
  • Public APIs remain backwards-compatible.
  • Nullable checks do not treat valid falsy values as absent.
  • Verify an explicit null path with existing checks or manual verification when behavior depends on absence.

FAQ

What does the nullable-new-params skill do?

Fix newly added optional parameters, optional React props, and optional type/interface members in Remotion monorepo diffs by converting internal APIs to required nullable values and updating call sites. Use when a PR, review, or user asks to forbid new foo?: T / param?: T additions except for exported or documented public APIs where requiring the value would be breaking.

How do I install nullable-new-params?

Run npx skills add https://github.com/remotion-dev/remotion --skill nullable-new-params in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/nullable-new-params/ (personal) or .claude/skills/nullable-new-params/ (project).

Which AI agents can use nullable-new-params?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is nullable-new-params safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains nullable-new-params?

It is published by remotion-dev in remotion-dev/remotion. It has 630 recorded installs.

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