TypeScript · Narrowing

TypeScript Narrowing puzzles

12 TypeScript puzzles on narrowing. Read the snippet, guess the output, then reveal the answer and why TypeScript behaves that way.

• #1362026-10-20
• #1042026-09-18
• #1022026-09-16
• #792026-08-24
• #772026-08-22
• #762026-08-21
• #682026-08-13
• #672026-08-12
• #462026-07-22
• #282026-07-04
• #232026-06-29
• #162026-06-22