EC
TS2878
TypeScriptERRORNotableTypeHIGH confidence

This import path is unsafe to rewrite because it resolves to another project,...

Production Risk

Build will fail; resolve before shipping.

What this means

A type-checking error (TS2878): This import path is unsafe to rewrite because it resolves to another project, and the relative path between the projects' output files is not the same as the relative path between its input files.. This diagnostic is emitted by the TypeScript compiler when this import path is unsafe to rewrite because it resolves to another project, and the relative path between the projects' output files is not the same as the relative path between its input files..

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

TypeScript compiler reports TS2878 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS2878
// This import path is unsafe to rewrite because it resolves to another project, and the relative path between the projects' output files is not the same as the relative path between its input files.

expected output

error TS2878: This import path is unsafe to rewrite because it resolves to another project, and the relative path between the projects' output files is not the same as the relative path between its input files.

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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