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Your tsconfig.json turns on strict. To check a single file you run tsc app.ts. What happens to that config?
tsconfig.json
strict
tsc app.ts
It applies normally, as on any other tsc run.
Only the file lists such as include and exclude are bypassed, while everything under compilerOptions still applies.
include
exclude
compilerOptions
It is not loaded at all, so strict never reaches that compile.