spec.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property

Issue

I got following error when running ng test or ng test --include src/folder/component-name.component.spec.ts

Error Message

• Error: Module build failed (from ./node_modules/@ngtools/webpack/src/ivy/index.js): Error: component-file.component.spec.ts is missing from the TypeScript compilation. Please make sure it is in your tsconfig via the 'files' or 'include' property. at /node_modules/@ngtools/webpack/src/ivy/loader.js:60:26 at processTicksAndRejections (node:internal/process/task_queues:96:5) at runNextTicks (node:internal/process/task_queues:65:3) at processImmediate (node:internal/timers:437:9)

tsconfig.spec.json

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

tsconfig.app.json

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

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "importHelpers": true,
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "experimentalDecorators": true,
    "target": "es6",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2015",
      "es7",
      "dom"
    ],
    "module": "esnext",
    "allowSyntheticDefaultImports": true,
    "skipLibCheck": true,
  },
  "include": [
    "src/**/*",
  "exclude": [
    "node_modules",
    "**/*.spec.ts"
  ]
}

I guess this error, the test-component used lazy-module..,

Solution

You're excluding any spec.ts files from compilation. Remove this line from the exclude arrays.

"**/*.spec.ts"

Answered By - Chris Hamilton