What is presets.dev typescript.instructions.md?

A set of project-specific instructions for writing Rust, a compiled programming language with rules that check memory ownership and concurrency.

It guides ownership and borrowing, error results, small uses of unsafe code, asynchronous work, project structure, and tests.

It helps avoid unsafe memory practices, unexplained copies, ignored errors, and asynchronous code that does not handle cancellation correctly.

How beel-collab/presets.dev configures GitHub Copilot

Reuse

Borrowing it

Nothing to install: this file belongs to beel-collab/presets.dev. 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/beel-collab/presets.dev/main/release/typescript/native/copilot/.github/instructions/typescript.instructions.md

Clone the repo

git clone --depth 1 https://github.com/beel-collab/presets.dev

Made for: GitHub Copilot.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/beel-collab/presets.dev/typescript/github.svg)](https://agentmods.dev/instructions/beel-collab/presets.dev/typescript)

Your own site

<a href="https://agentmods.dev/instructions/beel-collab/presets.dev/typescript"><img src="https://agentmods.dev/badge/instructions/beel-collab/presets.dev/typescript/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/beel-collab/presets.dev/typescript"><img src="https://agentmods.dev/badge/instructions/beel-collab/presets.dev/typescript.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 956 This file is loaded in full into every session.

When invoked 956 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.

Model	Per session	Once invoked
Fable 5.1	$0.00956	$0.00956
Opus 5.5	$0.00382	$0.00382
Sonnet 5.5	$0.00191	$0.00191
Haiku 4.5	$0.00096	$0.00096

Measured today against content hash 29c863db6c95, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

presets.dev typescript.instructions.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 today.

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.

release/typescript/native/copilot/.github/instructions/typescript.instructions.md · 78 lines

How it starts

The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.

TypeScript Copilot Instructions: Strict Types and Runtime Checks

Path-specific Copilot instructions for TypeScript. They apply through applyTo and leave .github/copilot-instructions.md in place.

Updated for TypeScript 7.0.2, Nov 2026

Do not upgrade dependencies or the framework version unless the task asks.

Project shape

tsconfig.json is the source of truth. Preserve strict if it is on. Do not add a second config that weakens it for convenience. Path aliases, module, and moduleResolution stay as the project set them. Match the existing file layout.

A type-only import uses import type when the project is on verbatimModuleSyntax or already writes it that way. Do not import a type in a position that emits a runtime import the bundler will fail.

Types that match the data

Model a finite set with a discriminated union and a switch that is exhaustive. Prefer unknown at a boundary and narrow it. any turns the checker off for everything it touches. A cast with as is a claim that you know more than the checker. Use it only after a runtime check, and keep the cast next to that check.

Optional fields and null are different. Do not paper over both with !. Handle the missing case.

Generics stay small. A function with three unconstrained type parameters is usually a dict in disguise. Name the constraint.

Runtime checks

The checker disappears at build time. Parse JSON, form data, query strings, and environment variables with the validator the project already uses. The type of a parsed value is the validator's output, not a hand-written interface that can drift.

Do not validate by annotating a parameter. function save(input: Note) does not check input at runtime.

Errors

Return a result or throw a typed error the caller catches. Do not catch (e) {}. If you catch unknown, narrow it before reading message. A public function documents the errors it raises by throwing types the project already defined.

Performance and the compiler

Read the full file on GitHub · 78 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.

today First seen · 78 lines · 956 tokens per session scan A 29c863db6c95

Subscribe to this mod's changes

presets.dev typescript.instructions.md is an instructions file published in the GitHub repository beel-collab/presets.dev (3 stars, last pushed yesterday), licensed MIT. It adds 956 tokens to every session, about $0.0038 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 2026-11-13.

Languages Rust agents antigravity cline codex copilot

presets.dev typescript.instructions.md next to 6 instructions from other repositories
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presets.dev: Instructions file for GitHub Copilot