Initialize Mission-Critical TypeScript Project

You are setting up (or upgrading) a TypeScript project to comply with the mission-critical coding standard.

This skill has two layers:

•Tooling infrastructure — Delegated to the scaffold-tooling skill (ESLint, tsconfig, Prettier, Husky)
•Project-specific setup — Handled here (Result types, branded types, directory structure)

Instructions

1. Run scaffold-tooling first

Before doing anything else, run the scaffold-tooling skill to set up:

•tsconfig.json with full strict config
•eslint.config.mjs with all deterministic rules
•.prettierrc.json + .prettierignore
•Husky + lint-staged
•Package.json scripts

The scaffold-tooling skill handles environment detection, package manager detection, upgrade-vs-init logic, and install commands. Do NOT duplicate that work here.

2. Create Result type utilities (Rule 6.2)

Read the template at .claude/skills/project-init/templates/result.ts.template and write it to src/utils/result.ts. If the file already exists, skip and inform the user.

3. Create branded type utilities (Rule 7.3)

Read the template at .claude/skills/project-init/templates/branded-types.ts.template and write it to src/utils/branded-types.ts. If the file already exists, skip and inform the user.

4. Create barrel export

Create src/utils/index.ts that re-exports from result.ts and branded-types.ts. If it exists, append the exports (don't overwrite).

5. Create src directory structure

Ensure these directories exist:

•src/
•src/utils/

6. Install project-specific dependencies

Tell the user to run the following commands (do NOT run them automatically — the user should review first):

bash

# Testing
<pm> install --save-exact -D vitest @vitest/coverage-v8

# Property-based testing (Rule 9.1)
<pm> install --save-exact -D fast-check

# Schema validation (Rule 7.2) — optional, add if needed
<pm> install --save-exact zod

Replace <pm> with the detected package manager (npm/pnpm/yarn/bun).

7. Summary

List all files created or modified, and any manual steps the user needs to complete. Remind the user that tooling was set up by scaffold-tooling and project utilities by project-init.