EC
TS1540
TypeScriptERRORNotableSyntaxHIGH confidence

A 'namespace' declaration should not be declared using the 'module' keyword. ...

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1540): A 'namespace' declaration should not be declared using the 'module' keyword. Please use the 'namespace' keyword instead.. This diagnostic is emitted by the TypeScript compiler when a 'namespace' declaration should not be declared using the 'module' keyword. Please use the 'namespace' keyword instead..

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

TypeScript compiler reports TS1540 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1540
// A 'namespace' declaration should not be declared using the 'module' keyword. Please use the 'namespace' keyword instead.

expected output

error TS1540: A 'namespace' declaration should not be declared using the 'module' keyword. Please use the 'namespace' keyword instead.

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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