EC
TS2712
TypeScriptERRORNotableTypeHIGH confidence

A dynamic import call in ES5 requires the 'Promise' constructor. Make sure y...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2712): A dynamic import call in ES5 requires the 'Promise' constructor. Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.. This diagnostic is emitted by the TypeScript compiler when a dynamic import call in ES5 requires the 'Promise' constructor. Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option..

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

TypeScript compiler reports TS2712 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2712
// A dynamic import call in ES5 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.

expected output

error TS2712: A dynamic import call in ES5 requires the 'Promise' constructor.  Make sure you have a declaration for the 'Promise' constructor or include 'ES2015' in your '--lib' option.

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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