EC
TS17007
TypeScriptERRORNotableTypeHIGH confidence

A type assertion expression is not allowed in the left-hand side of an expone...

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS17007): A type assertion expression is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses.. This diagnostic is emitted by the TypeScript compiler when a type assertion expression is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses..

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

TypeScript compiler reports TS17007 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS17007
// A type assertion expression is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses.

expected output

error TS17007: A type assertion expression is not allowed in the left-hand side of an exponentiation expression. Consider enclosing the expression in parentheses.

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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