EC
TS8026
TypeScriptERRORNotableStrictHIGH confidence

Expected X type arguments; provide these with an '@extends' tag.

Production Risk

Build will fail; resolve before shipping.

What this means

A strict mode error (TS8026): Expected X type arguments; provide these with an '@extends' tag.. This diagnostic is emitted by the TypeScript compiler when expected X type arguments; provide these with an '@extends' tag..

Why it happens
  1. 1Incorrect number or type of generic type arguments
How to reproduce

TypeScript compiler reports TS8026 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS8026
// Expected X type arguments; provide these with an '@extends' tag.

expected output

error TS8026: Expected X type arguments; provide these with an '@extends' tag.

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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