Error map

TS2571: Object is of type 'unknown' TypeScript: error TS2571: Object is of type 'unknown'.

TypeScript · layer 1, On your device

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1 · On your device 4 · Application & API
TS2571: Object is of type 'unknown' — TypeScript: error TS2571: Object is of type 'unknown'. (TypeScript)TS2571: Obj…TS2339 — TS2339: Property 'x' does not exist on type 'Y'. (Node.js)TS2339TS1005: ';' expected / ',' expected (syntax error) — TypeScript: error TS1005: ';' expected. (TypeScript)TS1005: ';' expecte…TS2352: Conversion of type may be a mistake — TypeScript: error TS2352: Conversion of type 'string' to type 'number' may be a mistake because neither type sufficiently overlaps with the other (TypeScript)TS2352: Conversion …TS1208: File cannot be compiled under '--isolatedModules' because it is considered a global script file — TypeScript: error TS1208: 'index.ts' cannot be compiled under '--isolatedModules' because it is considered a global script file. Add an import, export, or an empty 'export {}' statement (TypeScript)TS1208: File cannot…TS18046: 'x' is of type 'unknown' — TypeScript: error TS18046: 'e' is of type 'unknown'. (catch variable) (TypeScript)TS18046: 'x' is of …TS1192: Module has no default export — TypeScript: error TS1192: Module '"./utils"' has no default export. (TypeScript)TS1192: Module has …TS1128: Declaration or statement expected — TypeScript: error TS1128: Declaration or statement expected. (TypeScript)TS1128: Declaration…Cannot find module './App.vue' or its corresponding type declarations — TypeScript: error TS2307: Cannot find module './App.vue' or its corresponding type declarations. (Vue)Cannot find module …ClassCastException — java.lang.ClassCastException: class A cannot be cast to class B (Java)ClassCastExceptionERR_INVALID_ARG_TYPE — TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined (Node.js)ERR_INVALID_ARG_TYPEERR_UNKNOWN_FILE_EXTENSION — TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" (Node.js)ERR_UNKNOWN_FILE_EX…Unexpected token < — SyntaxError: Unexpected token '<' (HTML served instead of JavaScript) (JavaScript)Unexpected token <unexpected end of input — SyntaxError: Unexpected end of input (JavaScript)unexpected end of i…missing ) — SyntaxError: missing ) after argument list (JavaScript)missing )TS2322 — TS2322: Type 'X' is not assignable to type 'Y' (TypeScript)TS2322TS2740: Type is missing the following properties — TypeScript: error TS2740: Type '{ name: string; }' is missing the following properties from type 'User': id, email (TypeScript)TS2740: Type is mis…ERR_REQUIRE_ESM — Error [ERR_REQUIRE_ESM]: require() of ES Module not supported (Node.js)ERR_REQUIRE_ESMSyntaxError import — SyntaxError: Cannot use import statement outside a module (Node.js)SyntaxError importERR_IMPORT_ATTRIBUTE_MISSING — TypeError [ERR_IMPORT_ATTRIBUTE_MISSING]: Module needs an import attribute of "type: json" (Node.js)ERR_IMPORT_ATTRIBUT…TS18048: 'x' is possibly 'undefined' — TypeScript: error TS18048: 'user' is possibly 'undefined'. (TypeScript)TS18048: 'x' is pos…TypeError: not a function — TypeError: x is not a function (JavaScript)TypeError: not a fu…not a constructor — TypeError: x is not a constructor (JavaScript)not a constructorTDZ — ReferenceError: Cannot access 'x' before initialization (JavaScript)TDZalready declared — SyntaxError: Identifier 'x' has already been declared (JavaScript)already declaredawait outside async — SyntaxError: await is only valid in async functions and the top level bodies of modules (JavaScript)await outside asyncunexpected identifier — SyntaxError: Unexpected identifier (JavaScript)unexpected identifi…TS2307 — TS2307: Cannot find module 'x' or its corresponding type declarations. (Node.js)TS2307TS7016 — TS7016: Could not find a declaration file for module 'x'. 'x.js' implicitly has an 'any' type. (Node.js)TS7016TS2304 — TS2304: Cannot find name 'x'. (Node.js)TS2304

Directly related (8)

TS2339Node.js

TS2339: Property 'x' does not exist on type 'Y'.

TypeScript’s type for the object doesn’t include that property.

TS1005: ';' expected / ',' expected (syntax error)TypeScript

TypeScript: error TS1005: ';' expected.

The parser hit a syntax error — missing punctuation, mismatched brackets, or an unsupported syntax for your TypeScript version.

TS2352: Conversion of type may be a mistakeTypeScript

TypeScript: error TS2352: Conversion of type 'string' to type 'number' may be a mistake because neither type sufficiently overlaps with the other

A type assertion (`as`) between unrelated types was rejected.

TS1208: File cannot be compiled under '--isolatedModules' because it is considered a global script fileTypeScript

TypeScript: error TS1208: 'index.ts' cannot be compiled under '--isolatedModules' because it is considered a global script file. Add an import, export, or an empty 'export {}' statement

With `isolatedModules`, every file must be a module (have an import or export).

TS18046: 'x' is of type 'unknown'TypeScript

TypeScript: error TS18046: 'e' is of type 'unknown'. (catch variable)

TypeScript 4.9+ reports `unknown` values with their name; most often the `catch (e)` variable.

TS1192: Module has no default exportTypeScript

TypeScript: error TS1192: Module '"./utils"' has no default export.

You used `import x from "./mod"` but the module only has named exports.

TS1128: Declaration or statement expectedTypeScript

TypeScript: error TS1128: Declaration or statement expected.

The parser found a token where a declaration or statement should start — usually stray braces/parentheses or code outside a funct…

Cannot find module './App.vue' or its corresponding type declarationsVue

TypeScript: error TS2307: Cannot find module './App.vue' or its corresponding type declarations.

TypeScript doesn't know what a `.vue` import is without a shim or Volar/`vue-tsc`.

Two steps away (21)

ClassCastExceptionJava

java.lang.ClassCastException: class A cannot be cast to class B

An object was cast to a type it isn’t.

ERR_INVALID_ARG_TYPENode.js

TypeError [ERR_INVALID_ARG_TYPE]: The "path" argument must be of type string. Received undefined

A Node API got an argument of the wrong type — usually undefined because an env var or config value is missing.

ERR_UNKNOWN_FILE_EXTENSIONNode.js

TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts"

Node tried to run a TypeScript file as ESM without a TypeScript loader.

Unexpected token <JavaScript

SyntaxError: Unexpected token '<' (HTML served instead of JavaScript)

The browser loaded a .js file but received HTML (an error page or the SPA index.html).

unexpected end of inputJavaScript

SyntaxError: Unexpected end of input

The parser reached the end of the code (or JSON) while still expecting more — a missing } ) ] or empty JSON.

missing )JavaScript

SyntaxError: missing ) after argument list

A function call’s parentheses are unbalanced — often an unescaped quote or a missing comma/plus.

TS2322TypeScript

TS2322: Type 'X' is not assignable to type 'Y'

You assigned a value whose type doesn’t match the declared type of the variable, property or return value.

TS2740: Type is missing the following propertiesTypeScript

TypeScript: error TS2740: Type '{ name: string; }' is missing the following properties from type 'User': id, email

An object doesn't provide all required properties of the target type.

ERR_REQUIRE_ESMNode.js

Error [ERR_REQUIRE_ESM]: require() of ES Module not supported

CommonJS code used `require()` on a package that is ES-module-only (node-fetch 3, chalk 5, nanoid 4, got 12…).

SyntaxError importNode.js

SyntaxError: Cannot use import statement outside a module

An `import` statement ran in a context treated as CommonJS (Node without "type": "module", a browser script without type="module"…

ERR_IMPORT_ATTRIBUTE_MISSINGNode.js

TypeError [ERR_IMPORT_ATTRIBUTE_MISSING]: Module needs an import attribute of "type: json"

An ES module imported a .json file without the required import attribute.

TS18048: 'x' is possibly 'undefined'TypeScript

TypeScript: error TS18048: 'user' is possibly 'undefined'.

A value that may be `undefined` is used without a check (TS 4.9+ message with the variable name).

TypeError: not a functionJavaScript

TypeError: x is not a function

You called something as a function, but its value is not a function (it’s undefined, a string, an object…).

not a constructorJavaScript

TypeError: x is not a constructor

new was used with something that isn’t a class/constructor — usually a wrong import.

TDZJavaScript

ReferenceError: Cannot access 'x' before initialization

A let/const/class was used before its declaration line ran (temporal dead zone) — often a circular import.

already declaredJavaScript

SyntaxError: Identifier 'x' has already been declared

The same let/const/class name was declared twice in the same scope.

await outside asyncJavaScript

SyntaxError: await is only valid in async functions and the top level bodies of modules

await was used inside a function that isn’t async (or in a classic, non-module script).

unexpected identifierJavaScript

SyntaxError: Unexpected identifier

The parser found a name where it expected punctuation — usually a missing comma, operator or quote.

TS2307Node.js

TS2307: Cannot find module 'x' or its corresponding type declarations.

TypeScript can’t resolve the import — the package isn’t installed, the path alias isn’t configured, or there are no types.

TS7016Node.js

TS7016: Could not find a declaration file for module 'x'. 'x.js' implicitly has an 'any' type.

The JavaScript package has no TypeScript types bundled and no @types package installed.

TS2304Node.js

TS2304: Cannot find name 'x'.

TypeScript doesn’t know an identifier — a missing import, missing type definitions (e.g. for Node or Jest globals), or a typo.

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