EC
TS2821
TypeScriptERRORNotableTypeHIGH confidence

Import assertions are only supported when the '--module' option is set to 'es...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2821): Import assertions are only supported when the '--module' option is set to 'esnext', 'node18', 'node20', 'nodenext', or 'preserve'.. This diagnostic is emitted by the TypeScript compiler when import assertions are only supported when the '--module' option is set to 'esnext', 'node18', 'node20', 'nodenext', or 'preserve'..

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

TypeScript compiler reports TS2821 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2821
// Import assertions are only supported when the '--module' option is set to 'esnext', 'node18', 'node20', 'nodenext', or 'preserve'.

expected output

error TS2821: Import assertions are only supported when the '--module' option is set to 'esnext', 'node18', 'node20', 'nodenext', or 'preserve'.

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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