What does tsconfig.spec.json do?

Question

I have seen this and this posts and they have made me understand tsconfig.app.json and tsconfig.json.

I have an angular app which has tsconfig.app.json, tsconfig.json and tsconfig.spec.json

What is the role of tsconfig.spec.json? What does the 'spec' in tsconfig.spec.json stand for?

I believe 'spec' is short for specification(s). The idea - as I understand it - is that a package's tests should be checking that the specifications (a codified version of the needs/requirements/expecations/deliberables) are met. — LJ Jones
– LJ Jones, Commented Feb 19, 2021 at 16:39
See also stackoverflow.com/questions/52890331/… and stackoverflow.com/questions/35470511/… and stackoverflow.com/questions/54865419/… — Michael Freidgeim
– Michael Freidgeim, Commented Mar 5, 2023 at 18:43

Cagri Tacyildiz · Accepted Answer · 2020-06-27 09:46:50Z

It is TypeScript configuration for the application tests.

For example below code you says

"types": ["jasmine", "node"]

I will use jasmine for testing on nodejs environment.

{ "extends": "../tsconfig.json", "compilerOptions": { "outDir": "../out-tsc/spec", "module": "commonjs", "target": "es5", "baseUrl": "", "types": [ "jasmine", "node" ] }, "files": [ "test.ts", "polyfills.ts" ], "include": [ "**/*.spec.ts", "**/*.d.ts" ] }

According to typescriptlang.org/tsconfig#types types declaration only describes which ./node_modules/@types/ subfolders are included. The main condition of tsconfig.spec.json file is to specify test files in "include": [ "*/.spec.ts" . Is the name tsconfig.spec.json just convention? Can someone use different config file name, e.g. tsconfig.test.json for the same purpose?

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