Following an update from typescript version 2.3.4 to 2.4.2, I encountered a compilation error stating, "The type definition file for 'reflect-metadata' cannot be found."

Recently, I encountered an issue with my React / Mobex application written in TypeScript and built by Webpack 1. Upon updating the TypeScript version from 2.3.4 to 2.4.2, an error started occurring. The error message reads:

ERROR in C:\myproject\tsconfig.json
error TS2688: Cannot find type definition file for 'reflect-metadata'.

Even after trying Typescript 2.7.2 and explicitly providing the path to typings in "paths", as well as installing the latest version of 'reflect-metadata' globally, the error persists.

tsconfig.json

{
    "compilerOptions": {
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "jsx": "react",
        "lib": ["dom", "es2015.promise", "es6"],
        "module": "commonjs",
        "moduleResolution": "node",
        "noImplicitAny": true,
        //"noUnusedLocals": true,
        "noUnusedParameters": true,
        "outDir": "./dist/",
        "sourceMap": true,
        "suppressImplicitAnyIndexErrors": true,
        "target": "es5",
        "types": ["reflect-metadata"],
        "baseUrl": ".",
        "paths": {
            "react-split-pane": ["./type_fixes/react-split-pane/index.d.ts"],
            "react-dropzone": ["./type_fixes/react-dropzone/index.d.ts"],
            "react-bootstrap-toggle": ["./type_fixes/react-bootstrap-toggle/index.d.ts"]
        }
    },
    "include": [
        "./src/**/*",
        "./index.tsx",
        "./declarations.d.ts"
    ],
    "exclude": [
        "node_modules"
    ]
}

package.json

"dependencies": {
                //...
    "reflect-metadata": "0.1.10",
                //...
},
  "devDependencies": {
     //...
    "typescript": "2.4.2",
    //...
  },
typescripttypescript-typingsreflect-metadata

Answer №1

Consider excluding reflect-metadata from the types section. Instead, import it as a regular package:

import 'reflect-metadata'; // Simply import it to access Reflect functionality

Reflect.defineMetadata(...)

Answer №2

Recently encountered a similar issue while attempting to use reflect-metadata without importing it :)

npm install --save-dev @types/reflect-metadata

Managed to resolve it despite the installation message stating that types are bundled with the reflect-metadata package.

Answer №3

When I recently updated TypeScript to version 5, I encountered a similar issue.

In my tsconfig.json file, there was a reference to reflect-metadata.

"types": ["reflect-metadata"]

Solving the problem was as simple as removing this reference.

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