a survival guide for typed JavaScript — Troop 1904 trail-tested

TypeScript Survival Guide

Model each outdoor skill in types, narrow what arrives from outside, and let the compiler prove every branch.

5 days · 15 decks

Course outline — Day 1–5

This section is interactive and needs JavaScript for the inline lessons. Download this section as PDF to follow along offline.

Get the lab starter kit

One command downloads the lab kit (package.json plus the two lab files), installs the test runner, and proves red before you touch anything. First run downloads the runner (about a minute on fast wifi, up to four on slow); if the room wifi stalls, follow along on the presenter's screen. macOS and Linux:

curl -fsSL https://d3c82cl9fpj2fy.cloudfront.net/labs/season-guard/setup.sh | bash

Windows PowerShell:

irm https://d3c82cl9fpj2fy.cloudfront.net/labs/season-guard/setup.ps1 | iex

package.json
season.ts (the stub you implement)
season.test.ts (four red tests, do not edit)

Troop 1904 · Atlanta Trailblazers

Meet your trail guides

Three scouts walk the course with you — same patrol, same story. Inline deck headers (woven by the course doc) show the scout working the use case for that deck.

Meet your trail guides — 3 scouts (collapsed by default)

Aaliyah — patrol leader

Voice & crisis comms · Day 1 primer, safety briefings

Why here: runs the safety-brief check on every Day 1 slide — if the guard fails, she calls the halt.

Maya — mechanic & tinkerer

Labs, tooling & capstone build · repairs gear from scraps

Why here: patches the build — tightens tsconfig, lints, and ships the capstone from camp scraps.

Navya — comms & GIS

External data, async & maps · tablet + GPS wristwatch

Why here: maps the async fetch — tablets, wrist GPS, and live tracking across the trail.

Full roster · 40 scouts — compact avatars (collapsed by default)

Illustrated portraits for the whole troop — 40px reserved avatars, not giant cards. Grid verifies /img/troop parity without disrupting the outline.

Aaliyah

seed 1020

Aarna

seed 1021

Ajei

seed 1022

Alasie

seed 1023

Amara

seed 1024

Amka

seed 1025

Anaya

seed 1026

Anjij

seed 1027

Aria

seed 1028

Avani

seed 1029

Dezba

seed 1030

Diya

seed 1031

Doli

seed 1032

Halona

seed 1033

Haseya

seed 1034

Imani

seed 1035

Kai

seed 1036

Kailani

seed 1037

Kallik

seed 1038

Kavya

seed 1039

Kehlani

seed 1040

Malia

seed 1041

Malina

seed 1042

Maya

seed 1043

Navya

seed 1044

Nia

seed 1045

Nizhoni

seed 1046

Panik

seed 1047

Saanvi

seed 1048

Sade

seed 1049

Sesi

seed 1050

Shandiin

seed 1051

Siku

seed 1052

Siya

seed 1053

Tapeesa

seed 1054

Tsintah

seed 1055

Yazhi

seed 1056

Yuka

seed 1057

Zola

seed 1058

Zuri

seed 1059

Chapter art · 23 illustrations — outdoor skills as TypeScript (collapsed)

Baseline (seed 1001–1015) + themed waves (2101–2108). Thumbs are 40px reserved; click-through reserved for future detail view — small here so the outline stays primary.