EC
TS2494
TypeScriptERRORNotableTypeHIGH confidence

Using a string in a 'for...of' statement is only supported in ECMAScript 5 an...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2494): Using a string in a 'for...of' statement is only supported in ECMAScript 5 and higher.. This diagnostic is emitted by the TypeScript compiler when using a string in a 'for...of' statement is only supported in ECMAScript 5 and higher..

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

TypeScript compiler reports TS2494 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2494
// Using a string in a 'for...of' statement is only supported in ECMAScript 5 and higher.

expected output

error TS2494: Using a string in a 'for...of' statement is only supported in ECMAScript 5 and higher.

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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