EC
TS18055
TypeScriptERRORNotableTypeHIGH confidence

'X' has a string type, but must have syntactically recognizable string syntax...

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS18055): 'X' has a string type, but must have syntactically recognizable string syntax when 'isolatedModules' is enabled.. This diagnostic is emitted by the TypeScript compiler when 'X' has a string type, but must have syntactically recognizable string syntax when 'isolatedModules' is enabled..

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

TypeScript compiler reports TS18055 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS18055
// 'X' has a string type, but must have syntactically recognizable string syntax when 'isolatedModules' is enabled.

expected output

error TS18055: 'X' has a string type, but must have syntactically recognizable string syntax when 'isolatedModules' is enabled.

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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