Challenge with module declaration in index.d.ts during upgrade from Angular 8 to 9 (excluding Material)

In my index.d.ts file, I have declared two modules like so:

declare module 'googlemaps';
declare module 'detect-resize';

Previously, these declarations worked perfectly fine, allowing me to utilize these modules.

The googlemaps module has a dependency on @types/googlemaps, but the actual Google Maps API cannot be loaded until runtime with an API key.

On the other hand, detect-resize lacks typing and requires the declare statement for that reason.

Up until Angular 8, I had no issues with these modules as long as they were included in index.d.ts. However, since upgrading to Angular 9, this approach does not resolve the problem, causing build errors.

I have come across similar problems related to Angular 9 and index.d.ts, but they all pertain to Angular Material. Changing the version of Angular Material is not a viable solution in this case.

If anyone has any insights or solutions to offer, I would greatly appreciate it!

angulartypescriptnpmangular9

Answer №1

It's quite puzzling why this solution works, but it does the trick. Originally, my tsconfig.app.json file had this configuration:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "types": []
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

After an automatic upgrade from Angular 8 to 9, the file was modified as follows:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "types": []
  },
  "files": [
    "main.ts",
    "polyfills.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ]
}

To fix the issue, I explicitly added index.d.ts in the files section like so:

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "baseUrl": "./",
    "types": []
  },
  "files": [
    "main.ts",
    "polyfills.ts",
    "index.d.ts"
  ],
  "include": [
    "src/**/*.d.ts"
  ]
}

The interesting part is that the pattern in the include section (src/**/*.d.ts) should cover index.d.ts (which resides at the root of the src directory). Therefore, the need to explicitly declare index.d.ts remains a bit perplexing.

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