EC
TS1456
TypeScriptERRORNotableSyntaxHIGH confidence

Type import assertions should have exactly one key - `resolution-mode` - with...

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1456): Type import assertions should have exactly one key - `resolution-mode` - with value `import` or `require`.. This diagnostic is emitted by the TypeScript compiler when type import assertions should have exactly one key - `resolution-mode` - with value `import` or `require`..

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

TypeScript compiler reports TS1456 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1456
// Type import assertions should have exactly one key - `resolution-mode` - with value `import` or `require`.

expected output

error TS1456: Type import assertions should have exactly one key - `resolution-mode` - with value `import` or `require`.

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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