Error codes reference

ZNTC assigns a unique code to every diagnostic. Click a code for details and a reproduction snippet.

Target/Compatibility

Code	Message
ZNTC0001	Top-level await is not available in the configured target environment
ZNTC0002	Top-level await requires ESM output format
ZNTC0003	Code splitting requires ESM output format
ZNTC0004	Entry path is empty or not found
ZNTC0005	preserveModules requires ESM output format

Bundler: Import/Export

Code	Message
ZNTC0100	Could not resolve import
ZNTC0101	Export not found in module
ZNTC0102	Circular dependency detected
ZNTC0103	Module resolution failed
ZNTC0104	Re-export references the module itself (self-cycle)

Bundler: File/Loader

Code	Message
ZNTC0200	Failed to read file
ZNTC0201	Failed to parse JSON
ZNTC0202	No loader is configured for this file type

Parser: Import/Export

Code	Message
ZNTC0300	’import’ declaration is only allowed in module code
ZNTC0301	’import’ declaration must be at the top level
ZNTC0302	’import defer/source’ requires a binding
ZNTC0303	String literal in import specifier requires ‘as’ binding
ZNTC0304	Duplicate import attribute key
ZNTC0305	’export’ declaration is only allowed in module code
ZNTC0306	’export’ declaration must be at the top level
ZNTC0307	String literal cannot be used as local binding in export
ZNTC0308	Module source string expected
ZNTC0309	’export’ is not allowed in statement position
ZNTC0310	’import’ is not allowed in statement position
ZNTC0311	’import’ cannot be used with ‘new’
ZNTC0312	’import.meta’ is only allowed in module code
ZNTC0313	Expected ‘import.meta’, ‘import.source’, or ‘import.defer’
ZNTC0314	’import.source’/‘import.defer’ requires arguments

Parser: Declaration/Class

Code	Message
ZNTC0400	Anonymous function declaration cannot be invoked
ZNTC0401	Function declaration is not allowed in statement position
ZNTC0402	Function declaration is not allowed in statement position in strict mode
ZNTC0403	Generator declaration is not allowed in statement position
ZNTC0404	Async function declaration is not allowed in statement position
ZNTC0405	Class declaration is not allowed in statement position
ZNTC0406	Class constructor cannot be a getter, setter, generator, or async
ZNTC0407	Class member cannot be named ‘#constructor’
ZNTC0408	Class field cannot be named ‘constructor’
ZNTC0409	Static class field cannot be named ‘prototype’
ZNTC0410	Static class method cannot be named ‘prototype’
ZNTC0411	Class expected after decorator
ZNTC0412	Class or export expected after decorator
ZNTC0413	Labelled function declaration is not allowed in loop body
ZNTC0414	Lexical declaration is not allowed in statement position

Parser: Binding/Identifier

Code	Message
ZNTC0500	Identifier expected
ZNTC0501	Binding pattern expected
ZNTC0502	Escaped reserved word cannot be used as identifier
ZNTC0503	Escaped reserved word cannot be used as identifier in strict mode
ZNTC0504	Reserved word cannot be used as identifier
ZNTC0505	Reserved word in strict mode cannot be used as identifier
ZNTC0506	Keywords cannot contain escape characters
ZNTC0507	’let’ is not allowed as variable name in lexical declaration
ZNTC0508	Const declarations must be initialized
ZNTC0509	’async’ is not allowed as identifier in for-of left-hand side
ZNTC0510	’let’ is not allowed as identifier in for-of left-hand side
ZNTC0511	Only a single variable declaration is allowed in a for-in/for-of statement
ZNTC0512	For-in/for-of loop variable declaration may not have an initializer
ZNTC0513	Rest element must be last element
ZNTC0514	Rest element may not have a trailing comma
ZNTC0515	Duplicate parameter name
ZNTC0516	Private name is not allowed in destructuring pattern
ZNTC0517	Invalid assignment target
ZNTC0518	Assignment to ‘eval’ or ‘arguments’ is not allowed in strict mode

Parser: Expression/Operator

Code	Message
ZNTC0600	Expression expected
ZNTC0601	Unary expression cannot be the left operand of ’**‘
ZNTC0602	Cannot mix ’??’ with ’&&’ or '
ZNTC0603	Private name is not valid outside of ‘in’ expression
ZNTC0604	Private name is not valid as right-hand side of ‘in’ expression
ZNTC0605	Private fields cannot be deleted
ZNTC0606	Private field access on super is not allowed
ZNTC0620	’super’ is not allowed outside of a method
ZNTC0621	’super()’ is only allowed in a class constructor
ZNTC0622	’super’ cannot be used as the base of an optional chain
ZNTC0607	Tagged template cannot be used in optional chain
ZNTC0608	Property key expected
ZNTC0609	Expected ’:’ after property key
ZNTC0610	Invalid shorthand property initializer
ZNTC0611	Reserved word cannot be used as shorthand property
ZNTC0612	Reserved word in strict mode cannot be used as shorthand property
ZNTC0613	’yield’ cannot be used as shorthand property in generator
ZNTC0614	’await’ cannot be used as shorthand property in async/module
ZNTC0615	Private identifier is not allowed as object property key
ZNTC0616	’arguments’ is not allowed in class field initializer
ZNTC0617	’arguments’ is not allowed in class static initializer
ZNTC0618	String literal contains lone surrogate
ZNTC0619	’new.target’ is not allowed outside of functions

Parser: Statement/Control Flow

Code	Message
ZNTC0700	’return’ outside of function
ZNTC0701	’break’ outside of loop or switch
ZNTC0702	’continue’ outside of loop
ZNTC0703	Only one default clause is allowed in a switch statement
ZNTC0704	Case or default expected
ZNTC0705	Catch or finally expected
ZNTC0706	No line break is allowed after ‘throw’
ZNTC0707	Escaped reserved word cannot be used as label
ZNTC0708	Escaped reserved word cannot be used as label in strict mode
ZNTC0709	Reserved word in strict mode cannot be used as label

Parser: Strict Mode

Code	Message
ZNTC0800	’with’ is not allowed in strict mode
ZNTC0801	Octal literals are not allowed in strict mode
ZNTC0802	Octal escape sequences are not allowed in strict mode
ZNTC0803	Deleting an identifier is not allowed in strict mode
ZNTC0804	”use strict” not allowed in function with non-simple parameters

Parser: Await/Yield/JSX/TS

Code	Message
ZNTC0900	’await’ cannot be used as identifier in this context
ZNTC0901	’await’ expression is not allowed in formal parameters
ZNTC0902	’await’ is not allowed in class static initializer
ZNTC0903	’await’ is not allowed in non-async function in module code
ZNTC0904	’await’ is not allowed in arrow function parameters
ZNTC0905	’await’ is not allowed in async arrow function parameters
ZNTC0906	’yield’ expression is not allowed in formal parameters
ZNTC0907	’yield’ is not allowed in arrow function parameters
ZNTC0908	Invalid escape sequence in template literal
ZNTC0909	Expected template continuation
ZNTC0910	JSX tag name expected
ZNTC0911	Spread expected
ZNTC0912	Type expected
ZNTC0913	Expected ‘in’ in mapped type
ZNTC0914	Expected ‘type’ after ‘opaque’
ZNTC0915	Modifiers cannot appear on index signature parameters
ZNTC0916	An index signature parameter cannot have a question mark
ZNTC0917	’yield’ is not allowed outside generator function
ZNTC0918	TypeScript syntax is not allowed in JavaScript source

Semantic: Redeclaration

Code	Message
ZNTC1000	Identifier has already been declared
ZNTC1001	Cannot be used as a binding identifier in strict mode

Semantic: Private Member

Code	Message
ZNTC1100	Private field has already been declared
ZNTC1101	Private field must be declared in an enclosing class

Semantic: Export/Label

Code	Message
ZNTC1200	Duplicate export name
ZNTC1201	Export is not defined
ZNTC1202	Label has already been declared
ZNTC1203	Cannot continue to non-loop label
ZNTC1204	Undefined label

Semantic: Class/Other

Code	Message
ZNTC1300	A class may only have one constructor
ZNTC1301	Property name proto appears more than once in object literal
ZNTC1302	Getter must not have any formal parameters
ZNTC1303	Setter must have exactly one formal parameter
ZNTC1400	Type reference is not defined in the same file
ZNTC1401	Prop type is not supported by codegen
ZNTC1402	NativeProps body is not an object literal or known wrapper
ZNTC1403	Duplicate component name in schema
ZNTC1404	Inheritance / intersection chain exceeds depth limit