EC
TS1355
TypeScriptERRORNotableSyntaxHIGH confidence

A 'const' assertion can only be applied to references to enum members, or str...

Production Risk

Build will fail; resolve before shipping.

What this means

A syntax error (TS1355): A 'const' assertion can only be applied to references to enum members, or string, number, boolean, array, or object literals.. This diagnostic is emitted by the TypeScript compiler when a 'const' assertion can only be applied to references to enum members, or string, number, boolean, array, or object literals..

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

TypeScript compiler reports TS1355 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS1355
// A 'const' assertion can only be applied to references to enum members, or string, number, boolean, array, or object literals.

expected output

error TS1355: A 'const' assertion can only be applied to references to enum members, or string, number, boolean, array, or object literals.

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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