EC
TS7019
TypeScriptERRORNotableStrictHIGH confidence

Rest parameter 'X' implicitly has an 'any[]' type.

Production Risk

Build will fail; resolve before shipping.

What this means

A strict mode error (TS7019): Rest parameter 'X' implicitly has an 'any[]' type.. This diagnostic is emitted by the TypeScript compiler when rest parameter 'X' implicitly has an 'any[]' type..

Why it happens
  1. 1TypeScript cannot infer the type and defaults to 'any' with --noImplicitAny
  2. 2Missing type annotation or type parameter
How to reproduce

TypeScript compiler reports TS7019 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS7019
// Rest parameter 'X' implicitly has an 'any[]' type.

expected output

error TS7019: Rest parameter 'X' implicitly has an 'any[]' type.

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.

What not to do

✕ Suppress with @ts-ignore instead of fixing the type

ts-ignore hides real type errors and makes refactoring unsafe.

Sources
Official documentation ↗

TypeScript Compiler Diagnostics

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