playwright-ts-lib: Instructions file for Claude Code

CLAUDE.md

playwright-ts-lib CLAUDE.md is an instructions file for Claude Code from vasu31dev/playwright-ts-lib. It costs 1,019 tokens per session, scanned A, original, MIT.

Instructions for a TypeScript library of reusable Playwright helpers for browser automation and testing. Playwright is a tool for controlling browsers and checking how web pages behave.

In plain words
What is it for?
Use it when developing or maintaining browser-test helpers for actions, assertions, locators, elements, pages, downloads, uploads, and related Playwright workflows.
Why use it?
It collects the commands and project layout needed to validate, build, test, lint, format, and reset the library consistently.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths.

This is vasu31dev/playwright-ts-lib's own configuration. It tells Claude Code how to work on playwright-ts-lib itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything playwright-ts-lib configures →

Reuse

Borrowing it

Nothing to install: this file belongs to vasu31dev/playwright-ts-lib. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/vasu31dev/playwright-ts-lib/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/vasu31dev/playwright-ts-lib

Made for: Claude Code.

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Per session 1,019 This file is loaded in full into every session.
When invoked 1,019 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.01019 $0.01019
Opus 5.5 $0.00408 $0.00408
Sonnet 5.5 $0.00204 $0.00204
Haiku 4.5 $0.00102 $0.00102

Measured 2mo ago against content hash f238020c4ab8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

playwright-ts-lib CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 88 lines

How it starts

The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project: vasu-playwright-utils

Playwright TypeScript utility library providing reusable helper methods for browser automation and testing.

Build & Run

  • Build: npm run build (runs tsc -p tsconfig.build.json, cleans dist/ first)
  • Type check: npm run validate (runs tsc --noEmit)
  • Clean: npm run clean (removes dist/)
  • Full reset: npm run ready (removes dist, node_modules, reinstalls, validates, builds, tests)

Test

  • All tests: npm test (Playwright Test)
  • Chromium only: npm run test:chromium
  • Headed (local dev): npm run local
  • Smoke/Regression: npm run test:smoke, npm run test:reg

Lint & Format

  • Lint: npm run lint
  • Lint fix: npm run lint:fix
  • Format: npm run format (Prettier)

Architecture

src/vasu-playwright-lib/
  index.ts              # Main entry, re-exports everything
  utils/
    action-utils.ts     # click, fill, hover, drag, alerts, download, upload
    assert-utils.ts     # expectElement*, expectPage* assertions
    locator-utils.ts    # getLocator, getLocatorByRole/Text/TestId, frames
    element-utils.ts    # getText, isElementVisible, waitForElement*
    page-utils.ts       # setPage/getPage, gotoURL, navigation, switchPage
    api-utils.ts        # getRequest, postRequest, putRequest, deleteRequest
  types/
    optional-parameter-types.ts  # All option types (ClickOptions, FillOptions, etc.)
  constants/            # Timeouts, load state defaults
  setup/                # Test setup helpers, custom logger

Subpath Exports

Consumers can import from the main package or specific subpaths:

import { click, fill } from 'vasu-playwright-utils';
import { click } from 'vasu-playwright-utils/action-utils';
import { expectElementToBeVisible } from 'vasu-playwright-utils/assert-utils';

Coding Conventions

  • All exported functions have JSDoc comments
  • Functions are async and accept string | Locator as input
  • Options use the pattern: options?: XxxOptions (intersection types from Playwright + custom extensions)
  • Visibility is enforced by default (onlyVisible: true); callers can opt out with { onlyVisible: false }
  • setPage(page) must be called before using any utility functions

Read the full file on GitHub · 88 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 88 lines · 1,019 tokens per session scan A f238020c4ab8

Subscribe to this mod's changes

playwright-ts-lib CLAUDE.md is an instructions file published in the GitHub repository vasu31dev/playwright-ts-lib (25 stars, last pushed 7mo ago), licensed MIT. It adds 1,019 tokens to every session, about $0.0041 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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