TS.01.02 JuniorCore — asked often

tsconfig and the strict family

Comes up in: Recruiter screen

This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.

What it covers

strict and what it enables (strictNullChecks, noImplicitAny, strictFunctionTypes, strictBindCallApply, useUnknownInCatchVariables…)
noUncheckedIndexedAccess
exactOptionalPropertyTypes
target, module, moduleResolution: bundler/nodenext
verbatimModuleSyntax, isolatedModules
TS 7 defaults (strict on) — fact

Words you will know

tsconfigstrict mode (TS)module resolution

What you will practise

turn on strict in a JS-ish project and fix the errors

Interview questions this answers

What does strict: true turn on?
What does noUncheckedIndexedAccess change?