EC
TS7054
TypeScriptERRORNotableStrictHIGH confidence

No index signature with a parameter of type 'X' was found on type 'X'.

Production Risk

Build will fail; resolve before shipping.

What this means

A strict mode error (TS7054): No index signature with a parameter of type 'X' was found on type 'X'.. This diagnostic is emitted by the TypeScript compiler when no index signature with a parameter of type 'X' was found on type 'X'..

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

TypeScript compiler reports TS7054 during type checking.

trigger — this will error
trigger — this will error
// Triggers TS7054
// No index signature with a parameter of type 'X' was found on type 'X'.

expected output

error TS7054: No index signature with a parameter of type 'X' was found on type 'X'.

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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