Web Reference: I often run into the 'not assignable' error if I have a string like 'banana' in my TypeScript code and the compiler I meant it as a string, whereas I really wanted it to be of type banana. Jan 16, 2026 · In this blog, we’ll demystify why this error happens, explore common scenarios where it arises, and provide actionable solutions to fix it. Whether you’re new to TypeScript or a seasoned developer, this guide will help you write safer, more robust code. Here’s an example that produces an error message longer than the example itself: Type '{ m: string[]; }' is not assignable to type '{ m: number[]; }'. Types of property 'm' are incompatible. Type 'string[]' is not assignable to type 'number[]'. Type 'string' is not assignable to type 'number'.
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Last Updated: April 8, 2026
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