Comprehensive compilation of Typescript error codes along with solutions

Question

Comprehensive compilation of Typescript error codes along with solutions

Where can I find a comprehensive list of Typescript error codes and their corresponding fixes?

I frequently encounter errors during compilation, such as:

data_loader_service.ts(10,13): error TS1005: '=>' expected.
data_loader_service.ts(10,24): error TS1144: '{' or ';' expected.
data_loader_service.ts(10,27): error TS1068: Unexpected token. A constructor, method, accessor, or property was expected.
data_loader_service.ts(14,1): error TS1128: Declaration or statement expected.

I am in search of a convenient resource where I can easily look up these error codes like TS1068 and learn about common causes and solutions.

I admire tools like Jscs which provide clear summaries of error codes.

For example, check out the rules page on Jscs:

I welcome suggestions that point me towards either source code references or websites similar to Jscs for assistance with Typescript (current version being 1.6).

typescript

Answer 1

Answer №1

Upon examining the 1.6.2 versions of the compiler's source files, such as tsc.js, tsserver.js, typescript.js, and typescriptServices.js, a variable named ts.Diagnostics is populated with a dictionary containing all the error codes.

For a detailed list of error codes and their definitions in version 1.6.2 (albeit presented in a less visually appealing manner), visit: https://github.com/Microsoft/TypeScript/blob/v1.6.2/src/compiler/diagnosticInformationMap.generated.ts

A more visually pleasing format of this information can be found here: https://github.com/Microsoft/TypeScript/blob/v1.6.2/src/compiler/diagnosticMessages.json

EDIT:

To access the errors specific to version 1.8.5, refer to: https://github.com/Microsoft/TypeScript/blob/v1.8.5/src/compiler/diagnosticMessages.json

Answer 2

Upon examining the 1.6.2 versions of the compiler's source files, such as tsc.js, tsserver.js, typescript.js, and typescriptServices.js, a variable named ts.Diagnostics is populated with a dictionary containing all the error codes.

For a detailed list of error codes and their definitions in version 1.6.2 (albeit presented in a less visually appealing manner), visit: https://github.com/Microsoft/TypeScript/blob/v1.6.2/src/compiler/diagnosticInformationMap.generated.ts

A more visually pleasing format of this information can be found here: https://github.com/Microsoft/TypeScript/blob/v1.6.2/src/compiler/diagnosticMessages.json

EDIT:

To access the errors specific to version 1.8.5, refer to: https://github.com/Microsoft/TypeScript/blob/v1.8.5/src/compiler/diagnosticMessages.json

Answer 3

Answer №2

I created a custom script to extract a basic reference table from the official TypeScript repository:

$ curl -sL https://github.com/microsoft/TypeScript/raw/v4.7.3/src/compiler/diagnosticMessages.json | jq -r 'to_entries[]|"TS\(.value.code): \(.key)"'

Here is the generated output:

TS1002: Unterminated string literal.
TS1003: Identifier expected.
TS1005: '{0}' expected.
TS1006: A file cannot have a reference to itself.
TS1007: The parser expected to find a '{1}' to match the '{0}' token here.
TS1009: Trailing comma not allowed.
TS1010: '*/' expected.
TS1011: An element access expression should take an argument.
TS1012: Unexpected token.
TS1013: A rest parameter or binding pattern may not have a trailing comma.
TS1014: A rest parameter must be last in a parameter list.
TS1015: Parameter cannot have question mark and initializer.
TS1016: A required parameter cannot follow an optional parameter.
TS1017: An index signature cannot have a rest parameter.
TS1018: An index signature parameter cannot have an accessibility modifier.
TS1019: An index signature parameter cannot have a question mark.
TS1020: An index signature parameter cannot have an initializer.
...
TS18012: '#constructor' is a reserved word.
TS18013: Property '{0}' is not accessible outside class '{1}' because it has a private identifier.
TS18014: The property '{0}' cannot be accessed on type '{1}' within this class because it is shadowed by another private identifier with the same spelling.
TS18015: Property '{0}' in type '{1}' refers to a different member that cannot be accessed from within type '{2}'.
TS18016: Private identifiers are not allowed outside class bodies.
TS18017: The shadowing declaration of '{0}' is defined here
TS18018: The declaration of '{0}' that you probably intended to use is defined here
TS18019: '{0}' modifier cannot be used with a private identifier.
TS18024: An enum member cannot be named with a private identifier.
TS18026: '#!' can only be used at the start of a file.
TS18027: Compiler reserves name '{0}' when emitting private identifier downlevel.
TS18028: Private identifiers are only available when targeting ECMAScript 2015 and higher.
TS18029: Private identifiers are not allowed in variable declarations.
TS18030: An optional chain cannot contain private identifiers.
TS18031: The intersection '{0}' was reduced to 'never' because property '{1}' has conflicting types in some constituents.
TS18032: The intersection '{0}' was reduced to 'never' because property '{1}' exists in multiple constituents and is private in some.
TS18033: Only numeric enums can have computed members, but this expression has type '{0}'. If you do not need exhaustiveness checks, consider using an object literal instead.
TS18034: Specify the JSX fragment factory function to use when targeting 'react' JSX emit with 'jsxFactory' compiler option is specified, e.g. 'Fragment'.
TS18035: Invalid value for 'jsxFragmentFactory'. '{0}' is not a valid identifier or qualified-name.
TS18036: Class decorators can't be used with static private identifier. Consider removing the experimental decorator.
TS18037: Await expression cannot be used inside a class static block.
TS18038: 'For await' loops cannot be used inside a class static block.
TS18039: Invalid use of '{0}'. It cannot be used inside a class static block.
TS18041: A 'return' statement cannot be used inside a class static block.

You can view the complete results here.

Answer 4

I created a custom script to extract a basic reference table from the official TypeScript repository:

$ curl -sL https://github.com/microsoft/TypeScript/raw/v4.7.3/src/compiler/diagnosticMessages.json | jq -r 'to_entries[]|"TS\(.value.code): \(.key)"'

Here is the generated output:

TS1002: Unterminated string literal.
TS1003: Identifier expected.
TS1005: '{0}' expected.
TS1006: A file cannot have a reference to itself.
TS1007: The parser expected to find a '{1}' to match the '{0}' token here.
TS1009: Trailing comma not allowed.
TS1010: '*/' expected.
TS1011: An element access expression should take an argument.
TS1012: Unexpected token.
TS1013: A rest parameter or binding pattern may not have a trailing comma.
TS1014: A rest parameter must be last in a parameter list.
TS1015: Parameter cannot have question mark and initializer.
TS1016: A required parameter cannot follow an optional parameter.
TS1017: An index signature cannot have a rest parameter.
TS1018: An index signature parameter cannot have an accessibility modifier.
TS1019: An index signature parameter cannot have a question mark.
TS1020: An index signature parameter cannot have an initializer.
...
TS18012: '#constructor' is a reserved word.
TS18013: Property '{0}' is not accessible outside class '{1}' because it has a private identifier.
TS18014: The property '{0}' cannot be accessed on type '{1}' within this class because it is shadowed by another private identifier with the same spelling.
TS18015: Property '{0}' in type '{1}' refers to a different member that cannot be accessed from within type '{2}'.
TS18016: Private identifiers are not allowed outside class bodies.
TS18017: The shadowing declaration of '{0}' is defined here
TS18018: The declaration of '{0}' that you probably intended to use is defined here
TS18019: '{0}' modifier cannot be used with a private identifier.
TS18024: An enum member cannot be named with a private identifier.
TS18026: '#!' can only be used at the start of a file.
TS18027: Compiler reserves name '{0}' when emitting private identifier downlevel.
TS18028: Private identifiers are only available when targeting ECMAScript 2015 and higher.
TS18029: Private identifiers are not allowed in variable declarations.
TS18030: An optional chain cannot contain private identifiers.
TS18031: The intersection '{0}' was reduced to 'never' because property '{1}' has conflicting types in some constituents.
TS18032: The intersection '{0}' was reduced to 'never' because property '{1}' exists in multiple constituents and is private in some.
TS18033: Only numeric enums can have computed members, but this expression has type '{0}'. If you do not need exhaustiveness checks, consider using an object literal instead.
TS18034: Specify the JSX fragment factory function to use when targeting 'react' JSX emit with 'jsxFactory' compiler option is specified, e.g. 'Fragment'.
TS18035: Invalid value for 'jsxFragmentFactory'. '{0}' is not a valid identifier or qualified-name.
TS18036: Class decorators can't be used with static private identifier. Consider removing the experimental decorator.
TS18037: Await expression cannot be used inside a class static block.
TS18038: 'For await' loops cannot be used inside a class static block.
TS18039: Invalid use of '{0}'. It cannot be used inside a class static block.
TS18041: A 'return' statement cannot be used inside a class static block.

You can view the complete results here.

Comprehensive compilation of Typescript error codes along with solutions

Answer №1

Answer №2

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