EC
TS2763
TypeScriptERRORNotableTypeHIGH confidence

Cannot iterate value because the 'next' method of its iterator expects type '...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2763): Cannot iterate value because the 'next' method of its iterator expects type 'X', but for-of will always send 'X'.. This diagnostic is emitted by the TypeScript compiler when cannot iterate value because the 'next' method of its iterator expects type 'X', but for-of will always send 'X'..

Why it happens
  1. 1Incorrect TypeScript syntax or type usage
  2. 2Type mismatch between declared and actual value
How to reproduce

TypeScript compiler reports TS2763 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2763
// Cannot iterate value because the 'next' method of its iterator expects type 'X', but for-of will always send 'X'.

expected output

error TS2763: Cannot iterate value because the 'next' method of its iterator expects type 'X', but for-of will always send 'X'.

Fix

Address the TypeScript diagnostic

WHEN When this error is reported by the compiler

Address the TypeScript diagnostic
// Run the TypeScript compiler for details:
npx tsc --noEmit
// Use the TypeScript playground to test your code:
// https://www.typescriptlang.org/play

Why this works

Review the full error message and location; the TypeScript handbook provides guidance on each error category.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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