What causes the module declaration in the .d.ts file to fail in an Angular application?

I have recently created a file named global.d.ts within the src folder and it contains the following content:

declare module 'ol-contextmenu';

Despite my efforts, placing the file in the root directory or in node-modules/@types did not solve the issue.

In my component, I import ol-contextmenu (which lacks types) like so:

import ContextMenu from 'ol-contextmenu'; 

I have made various edits to tsconfig.json in an attempt to locate the .d.ts file. For example:

"include": [
  "src/global.d.ts"
]

However, I consistently encounter this error:

error TS7016: Could not find a declaration file for module 'ol-contextmenu'. 'C:/dev/nis/NIS/ClientApp/node_modules/ol-contextmenu/dist/ol-contextmenu.js' implicitly has an 'any' type. Try

npm install @types/ol-contextmenu
if it exists or add a new declaration (.d.ts) file containing declare module 'ol-contextmenu';

5 import ContextMenu from 'ol-contextmenu'; ~~~~~~~~~~~~~~~~

Even attempting to copy the file to node-modules/@types yields the same error message.

Answer №1

If you want to inform Typescript that you will be using ECMAScript modules format instead of CommonJs modules format, you can follow one of the methods mentioned in the Typescript official documentation.

In my situation, I chose to create an index.d.ts file specifically within the src folder of my Angular application. Inside this file, you can declare all the necessary JavaScript files as ECMAScript modules. For example:

declare module 'ol-contextmenu';

Why do this? According to the documentation:

TypeScript follows a similar module resolution process to Node for package.json files, with an extra step for locating .d.ts files. Essentially, it will check the optional "types" field first, then the "main" field, and finally attempt to find index.d.ts in the root.

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