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I am trying to ad some custom typings definition file in angular but facing some error.
in app folder I have external folder in which I have external.d.ts file and below code
declare function format(input: string, ...args): string;
in tsconfig.json I tried adding "files": ["/app/external/external.d.ts"]
but its not working.
can somebody give me idea about adding custom typings file to angular 6.
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To do this you should edit the tsconfig. json file, and add the typeRoots property under the compilerOptions property. When the property is excluded, TypeScript is automatically searching for types in the node_modules/@types folder of your project.
Typings describes contract of libraries you use. This allows the TypeScript compiler that what you use exist (classes, properties, ...). You can install typings from a repository using the typings command or let the compiler find out them leveraging the strategy specified in the tsconfig.
TypeScript is a primary language for Angular application development. It is a superset of JavaScript with design-time support for type safety and tooling.
json file is a file of JSON format which allows us to point the root level files and different compiler options to setup that require to compile a TypeScript based projects. The existence of this file in a project specifies that the given directory is the TypeScript project folder root.
Add the custom typing file to typeRoots in tsconfig.json in the root folder work for me.
"typeRoots": ["node_modules/@types", "src/typings.d.ts"],
The correct property is types inside tsconfig.json:
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