TS2777
TypeScriptERRORNotableTypeHIGH confidence
The operand of an increment or decrement operator may not be an optional prop...
Production Risk
Build will fail; resolve before shipping.
What this means
A type-checking error (TS2777): The operand of an increment or decrement operator may not be an optional property access.. This diagnostic is emitted by the TypeScript compiler when the operand of an increment or decrement operator may not be an optional property access..
Why it happens
- 1Incorrect TypeScript syntax or type usage
- 2Type mismatch between declared and actual value
How to reproduce
TypeScript compiler reports TS2777 during type checking.
trigger — this will error
trigger — this will error
// Triggers TS2777 // The operand of an increment or decrement operator may not be an optional property access.
expected output
error TS2777: The operand of an increment or decrement operator may not be an optional property access.
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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