EC
TS95154
TypeScriptERRORNotableConfigHIGH confidence

Can only convert string concatenations and string literals

Production Risk

Build will fail; resolve before shipping.

What this means

A TypeScript diagnostic (TS95154): Can only convert string concatenations and string literals. This diagnostic is emitted by the TypeScript compiler when can only convert string concatenations and string 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 TS95154 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS95154
// Can only convert string concatenations and string literals

expected output

error TS95154: Can only convert string concatenations and string literals

Fix

Fix the tsconfig.json option

WHEN When a compiler option is invalid or missing

Fix the tsconfig.json option
// tsconfig.json
{
  "compilerOptions": {
    // Review and correct the flagged option
  }
}
// Run: npx tsc --showConfig to see effective config

Why this works

TypeScript validates tsconfig.json options; check the official tsconfig reference for valid values.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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