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Agent skill

Path To Regexp V8 Migration

by reactive in reactive/data-client

Migrate @data-client/rest path strings from path-to-regexp v6 to v8 syntax.

Apache-2.0Auto-check passed

Install Path To Regexp V8 Migration

skills CLI
$ npx skills add reactive/data-client --skill path-to-regexp-v8-migration -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install reactive/data-client path-to-regexp-v8-migration --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/reactive/data-client.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/path-to-regexp-v8-migration .claude/skills/path-to-regexp-v8-migration && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
path-to-regexp-v8-migration
GitHub stars
2k
Token cost
~735 tokens
SKILL.md length
239 words
Files
1
Skills in repo
18
Repo updated
First seen
Licence
Apache-2.0

At a glance

Migrate @data-client/rest path strings from path-to-regexp v6 to v8 syntax.

  • Upgrading path-to-regexp
  • SKILL.md covers Migration Rules, Combined Examples, Where to Find Paths and Type System
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Updating RestEndpoint.path

What it does

Path To Regexp V8 Migration is an agent skill from reactive/data-client. Migrate @data-client/rest path strings from path-to-regexp v6 to v8 syntax. Use when upgrading path-to-regexp, updating RestEndpoint.path or resource path strings, or when seeing errors about unexpected ?, +, (, or ) in paths.

Its SKILL.md is about 740 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

The repository describes itself as: Async State Management without the Management. REST, GraphQL, SSE, Websockets. The licence is Apache-2.0.

When your agent uses it

  • Upgrading path-to-regexp
  • Updating RestEndpoint.path
  • Resource path strings
  • Seeing errors about unexpected ?

Example prompts

  • “/path-to-regexp-v8-migration”

What it can do on your machine

Read from SKILL.md and the folder at commit c0abfff. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    Links to these hosts (documentation or services it may open):

    • github.com

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Path To Regexp V8 Migration loads about 735 tokens when it runs. Until then it costs about 64 tokens; SKILL.md has 239 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~64
When it runs · the whole SKILL.md, loaded when a task matches
~735

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from reactive/data-client at commit c0abfff, republished under its Apache-2.0 licence (© reactive). 239 words, ~735 tokens.

Download SKILL.mdSave it as .claude/skills/path-to-regexp-v8-migration/SKILL.md (or your agent's skills folder).
name
path-to-regexp-v8-migration
description
Migrate @data-client/rest path strings from path-to-regexp v6 to v8 syntax. Use when upgrading path-to-regexp, updating RestEndpoint.path or resource path strings, or when seeing errors about unexpected ?, +, (, or ) in paths.

path-to-regexp v6 → v8 Migration

Applies to path in RestEndpoint, resource(), and any string passed to path-to-regexp.

Reference: path-to-regexp README errors section

Migration Rules

Optional parameters

? suffix removed. Wrap the optional segment (including its prefix) in {}.

/:id?           →  {/:id}
/users/:id?     →  /users{/:id}
/files/:name?   →  /files{/:name}
Repeating parameters

+ (one-or-more) and * (zero-or-more) suffixes removed. Use *name wildcard syntax.

/:path+         →  /*path
/:path*         →  {/*path}
Quoted parameter names

Parameter names must be valid JS identifiers. Names with special characters need double quotes.

/:with-dash     →  /:"with-dash"
/:my.param      →  /:"my.param"
Escaping special characters

Characters including {}()[]+?!:*\\ must be escaped with \\ when used as literals (see path-to-regexp errors). A literal ? in the path (e.g. before fixed query text like ?per_page=50) must stay as \\? in the source string — removing the backslash causes Unexpected ? at compile() time.

/(literal)      →  /\\(literal\\)
/[bracket]      →  /\\[bracket\\]
/a+b            →  /a\\+b               (+ is special unless escaped)
/resource?p=1   →  /resource\\?p=1      (? starts a modifier unless escaped)

Optional path params no longer use a trailing ? on :name — use {/:name} instead (see above); that is different from a literal ? in the URL.

Custom regex removed

Inline regex like /:id(\d+) is no longer supported. Remove regex patterns.

/:id(\d+)       →  /:id

Combined Examples

Optional with prefix:

/:attr1?{-:attr2}?{-:attr3}?   →  {/:attr1}{-:attr2}{-:attr3}

Query params embedded in path (prefer grouped params; do not drop \\ before a literal ? unless you rewrite to this form):

/search\\?q=:q?&page=:page?    →  /search?{q=:q}{&page=:page}

Where to Find Paths

Search patterns for locating v6 paths in a codebase:

  • path: properties in RestEndpoint, resource(), .extend() calls
  • Docs under docs/rest/api/
  • Type tests in typescript-tests/
  • Blog posts and changelogs with code examples

Type System

pathTypes.ts infers TypeScript parameter types from path strings:

  • :name and *name → required parameter
  • {/:name} and {/*name} → optional parameter (trailing } signals optionality)
  • :"quoted" → CleanKey strips quotes for the property name
  • \\: / \\* / \\} → escaped, not treated as parameters

© reactive, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/path-to-regexp-v8-migration of reactive/data-client.

Open the folder on GitHubat commit c0abfff

Compare with similar skills

Path To Regexp V8 Migration next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Path To Regexp V8 Migration compared with similar skills
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Path To Regexp V8 Migration this skillreactive/data-client2k—~735Automated safety check: PassApache-2.0
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Database Migrationsaffaan-m/ECC276k4 repos~3kAutomated safety check: PassMIT
Database Migrationsaffaan-m/ECC276k1 repos~2.4kAutomated safety check: PassMIT
Safe Database Migration Patternsaffaan-m/ECC276k—~3.3kAutomated safety check: PassMIT
Migrate Createruvnet/ruflo74k—~583Automated safety check: NotesMIT

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Questions about Path To Regexp V8 Migration

What does Path To Regexp V8 Migration do?

Migrate @data-client/rest path strings from path-to-regexp v6 to v8 syntax. Path To Regexp V8 Migration is an agent skill from reactive/data-client. Migrate @data-client/rest path strings from path-to-regexp v6 to v8 syntax.

When should I use Path To Regexp V8 Migration?

Path To Regexp V8 Migration fits situations like: upgrading path-to-regexp; updating RestEndpoint.path; resource path strings; seeing errors about unexpected ?.

How do I install Path To Regexp V8 Migration in Claude Code?

Run `npx skills add reactive/data-client --skill path-to-regexp-v8-migration -a claude-code`. Or copy the skill folder (.agents/skills/path-to-regexp-v8-migration in reactive/data-client) into .claude/skills/path-to-regexp-v8-migration in your project. Claude Code loads it when a task matches its description.

How do I install Path To Regexp V8 Migration in Codex?

Run `npx skills add reactive/data-client --skill path-to-regexp-v8-migration -a codex`. Or copy the skill folder (.agents/skills/path-to-regexp-v8-migration in reactive/data-client) into .agents/skills/path-to-regexp-v8-migration in your project. Codex loads it when a task matches its description.

Can I use Path To Regexp V8 Migration in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add reactive/data-client --skill path-to-regexp-v8-migration -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/path-to-regexp-v8-migration, .gemini/skills/path-to-regexp-v8-migration, .github/skills/path-to-regexp-v8-migration and .opencode/skills/path-to-regexp-v8-migration in your project.

What does Path To Regexp V8 Migration need to run?

SKILL.md names no scripts, command-line tools or credentials: Path To Regexp V8 Migration is instructions for the agent only.

Does Path To Regexp V8 Migration access the network?

SKILL.md names 1 domain. As links in the text: github.com. This is read from the text; nothing was executed.

Is Path To Regexp V8 Migration safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Path To Regexp V8 Migration use?

Path To Regexp V8 Migration is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Path To Regexp V8 Migration use?

About 735 tokens (SKILL.md is roughly 2.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Path To Regexp V8 Migration?

Skills that share tags, products or a category with Path To Regexp V8 Migration: Reversible Migration (JuliusBrussee/caveman, 111k stars), Database Migrations (affaan-m/ECC, 276k stars), Database Migrations (affaan-m/ECC, 276k stars) and Safe Database Migration Patterns (affaan-m/ECC, 276k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Path To Regexp V8 Migration?

reactive (a GitHub organization) maintains it in reactive/data-client, which has 2,038 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on October 10, 2026.

Source: reactive/data-client on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.