EC
TS2877
TypeScriptERRORNotableTypeHIGH confidence

This import uses a 'X' extension to resolve to an input TypeScript file, but ...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2877): This import uses a 'X' extension to resolve to an input TypeScript file, but will not be rewritten during emit because it is not a relative path.. This diagnostic is emitted by the TypeScript compiler when this import uses a 'X' extension to resolve to an input TypeScript file, but will not be rewritten during emit because it is not a relative path..

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

TypeScript compiler reports TS2877 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2877
// This import uses a 'X' extension to resolve to an input TypeScript file, but will not be rewritten during emit because it is not a relative path.

expected output

error TS2877: This import uses a 'X' extension to resolve to an input TypeScript file, but will not be rewritten during emit because it is not a relative path.

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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