Error map

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

Node.js · layer 4, Application & API

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1 · On your device 4 · Application & API 7 · Build & delivery
ERR_REQUIRE_ESM — Error [ERR_REQUIRE_ESM]: require() of ES Module not supported (Node.js)ERR_REQUIRE…MODULE_NOT_FOUND — Error: Cannot find module 'x' (MODULE_NOT_FOUND) (Node.js)MODULE_NOT_FOUNDJest ESM — Jest: SyntaxError: Cannot use import statement outside a module (Jest encountered an unexpected token) (React)Jest ESMSyntaxError import — SyntaxError: Cannot use import statement outside a module (Node.js)SyntaxError importUnhandledPromiseRejection — Node.js: [UnhandledPromiseRejection] — This error originated either by throwing inside of an async function without a catch block (Node.js)UnhandledPromiseRej…ERR_PACKAGE_PATH_NOT_EXPORTED — Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './x' is not defined by "exports" (Node.js)ERR_PACKAGE_PATH_NO…ERR_IMPORT_ATTRIBUTE_MISSING — TypeError [ERR_IMPORT_ATTRIBUTE_MISSING]: Module needs an import attribute of "type: json" (Node.js)ERR_IMPORT_ATTRIBUT…ERR_UNKNOWN_FILE_EXTENSION — TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" (Node.js)ERR_UNKNOWN_FILE_EX…ERESOLVE — npm ERR! code ERESOLVE — unable to resolve dependency tree (npm)ERESOLVEENOENT — Error: ENOENT: no such file or directory (Node.js)ENOENTTypeError: not a function — TypeError: x is not a function (JavaScript)TypeError: not a fu…not wrapped in act — Warning: An update to Component inside a test was not wrapped in act(...) (React)not wrapped in actUnable to find an element — TestingLibraryElementError: Unable to find an element with the text: x (React)Unable to find an e…Expected to be running in 'ProxyZone' — Angular tests: Error: Expected to be running in 'ProxyZone', but it was not found. (Angular)Expected to be runn…ReferenceError — ReferenceError: x is not defined (JavaScript)ReferenceErrorERR_HTTP_HEADERS_SENT — Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client (Node.js)ERR_HTTP_HEADERS_SE…Unhandled 'error' event — Error: Unhandled 'error' event (events.js / node:events) (Node.js)Unhandled 'error' e…ECONNREFUSED — Error: connect ECONNREFUSED 127.0.0.1:5432 (Node.js)ECONNREFUSEDFailed to fetch — TypeError: Failed to fetch / NetworkError when attempting to fetch resource (JavaScript)Failed to fetchawait outside async — SyntaxError: await is only valid in async functions and the top level bodies of modules (JavaScript)await outside asyncEBADENGINE — npm WARN EBADENGINE Unsupported engine / The engine "node" is incompatible with this module (Node.js)EBADENGINEDEP0040 — DeprecationWarning: The `punycode` module is deprecated (DEP0040) (Node.js)DEP0040node-sass — Error: Node Sass does not yet support your current environment (Node.js)node-sassDEP0005 — DeprecationWarning: Buffer() is deprecated due to security and usability issues (DEP0005) (Node.js)DEP0005TS2307 — 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 (7)

MODULE_NOT_FOUNDNode.js

Error: Cannot find module 'x' (MODULE_NOT_FOUND)

Node can’t resolve the module path — the package isn’t installed, or a relative path/extension is wrong.

Jest ESMReact

Jest: SyntaxError: Cannot use import statement outside a module (Jest encountered an unexpected token)

Jest tried to run untransformed ES module syntax — usually from a dependency in node_modules.

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"…

UnhandledPromiseRejectionNode.js

Node.js: [UnhandledPromiseRejection] — This error originated either by throwing inside of an async function without a catch block

A promise rejected and nothing handled it; since Node 15 this crashes the process.

ERR_PACKAGE_PATH_NOT_EXPORTEDNode.js

Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './x' is not defined by "exports"

You imported a deep path inside a package that its package.json "exports" field doesn’t expose.

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.

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.

Two steps away (19)

ERESOLVEnpm

npm ERR! code ERESOLVE — unable to resolve dependency tree

npm 7+ found conflicting peer dependency requirements and refuses to install a broken tree.

ENOENTNode.js

Error: ENOENT: no such file or directory

A file or directory the program tried to open doesn’t exist at that path.

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 wrapped in actReact

Warning: An update to Component inside a test was not wrapped in act(...)

A component updated state after the test’s synchronous assertions — async work wasn’t awaited.

Unable to find an elementReact

TestingLibraryElementError: Unable to find an element with the text: x

getBy* found no matching element in the rendered output.

Expected to be running in 'ProxyZone'Angular

Angular tests: Error: Expected to be running in 'ProxyZone', but it was not found.

`fakeAsync` / `waitForAsync` was used, but the test environment's zone testing setup is missing.

ReferenceErrorJavaScript

ReferenceError: x is not defined

Code refers to a variable or function name that doesn’t exist in the current scope.

ERR_HTTP_HEADERS_SENTNode.js

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

An Express/Node handler tried to send a second response (or set headers) after one was already sent.

Unhandled 'error' eventNode.js

Error: Unhandled 'error' event (events.js / node:events)

An EventEmitter (stream, socket, child process, server) emitted 'error' and nothing listened for it, so Node crashed.

ECONNREFUSEDNode.js

Error: connect ECONNREFUSED 127.0.0.1:5432

Nothing is listening at that host:port — the target service is down or you’re connecting to the wrong address.

Failed to fetchJavaScript

TypeError: Failed to fetch / NetworkError when attempting to fetch resource

The browser couldn’t complete the request at the network level — CORS, DNS, offline, blocked mixed content, or the server refused…

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).

EBADENGINENode.js

npm WARN EBADENGINE Unsupported engine / The engine "node" is incompatible with this module

A package requires a different Node.js version than the one you’re running.

DEP0040Node.js

DeprecationWarning: The `punycode` module is deprecated (DEP0040)

A dependency imports Node’s built-in punycode module, deprecated since Node 21.

node-sassNode.js

Error: Node Sass does not yet support your current environment

node-sass (deprecated) has no binary for your Node version/OS.

DEP0005Node.js

DeprecationWarning: Buffer() is deprecated due to security and usability issues (DEP0005)

Code (yours or a dependency) uses the deprecated new Buffer() constructor.

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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