EC
TS5090
TypeScriptERRORNotableConfigHIGH confidence

Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget ...

Production Risk

Build will fail; resolve before shipping.

What this means

A compiler configuration error (TS5090): Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?. This diagnostic is emitted by the TypeScript compiler when non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?.

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

TypeScript compiler reports TS5090 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS5090
// Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?

expected output

error TS5090: Non-relative paths are not allowed when 'baseUrl' is not set. Did you forget a leading './'?

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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