Use tsconfig-paths for easier access to the source

Currently, tests only can import source code modules through relative
paths `../../`. This makes it very difficult to refactor and organize
tests in folders as the paths change.

[tsconfig-paths](https://www.npmjs.com/package/tsconfig-paths) allows to
reference the source through an alias defined in the "paths" section of
tsconfig.json

package-lock.json

@@ -9760,6 +9760,12 @@
         "ansi-regex": "^2.0.0"
       }
     },
+    "strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha512-vavAMRXOgBVNF6nyEEmL3DBK19iRpDcoIwW+swQ+CbGiu7lju6t+JklA1MHweoWtadgt4ISVUsXLyDq34ddcwA==",
+      "dev": true
+    },
     "strip-final-newline": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-final-newline/-/strip-final-newline-2.0.0.tgz",
@@ -10446,6 +10452,31 @@
         }
       }
     },
+    "tsconfig-paths": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-4.1.0.tgz",
+      "integrity": "sha512-AHx4Euop/dXFC+Vx589alFba8QItjF+8hf8LtmuiCwHyI4rHXQtOOENaM8kvYf5fR0dRChy3wzWIZ9WbB7FWow==",
+      "dev": true,
+      "requires": {
+        "json5": "^2.2.1",
+        "minimist": "^1.2.6",
+        "strip-bom": "^3.0.0"
+      },
+      "dependencies": {
+        "json5": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.1.tgz",
+          "integrity": "sha512-1hqLFMSrGHRHxav9q9gNjJ5EXznIxGVO09xQRrwplcS8qs28pZ8s8hupZAmqDwZUmVZ2Qb2jnyPOWcDH8m8dlA==",
+          "dev": true
+        },
+        "minimist": {
+          "version": "1.2.6",
+          "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.6.tgz",
+          "integrity": "sha512-Jsjnk4bw3YJqYzbdyBiNsPWHPfO++UGG749Cxs6peCu5Xg4nrena6OVxOYxrQTqww0Jmwt+Ref8rggumkTLz9Q==",
+          "dev": true
+        }
+      }
+    },
     "tslib": {
       "version": "1.9.3",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.9.3.tgz",

package.json

@@ -119,6 +119,7 @@
 		"tmp": "^0.1.0",
 		"ts-loader": "^7.0.5",
 		"ts-node": "^8.10.2",
+		"tsconfig-paths": "^4.1.0",
 		"typed-error": "^3.2.1",
 		"typescript": "^4.2.4",
 		"webpack": "^4.44.1",

test/.mocharc.js

@@ -5,6 +5,7 @@ module.exports = {
 	require: [
 		// Files to execute before running suites
 		'ts-node/register/transpile-only',
+		'tsconfig-paths/register',
 		'test/config/fixtures.ts',
 	],
 	spec: ['test/**/*.spec.ts'],

test/01-constants.spec.ts

@@ -1,5 +1,5 @@
 import { expect } from 'chai';
-import constants = require('../src/lib/constants');
+import * as constants from '~/src-lib/constants';
 
 describe('constants', function () {
 	it('has the correct configJsonPathOnHost', () =>

tsconfig.json

@@ -1,5 +1,6 @@
 {
 	"compilerOptions": {
+		"baseUrl": "./",
 		"target": "ES2019",
 		"module": "commonjs",
 		"strict": true,
@@ -11,7 +12,13 @@
 		"skipLibCheck": true,
 		"lib": ["es2019"],
 		"resolveJsonModule": true,
-		"allowJs": true
+		"allowJs": true,
+		"paths": {
+			"~/src/*": ["src/*"],
+			"~/lib/*": ["src/lib/*"],
+			"~/test-lib/*": ["test/lib/*"],
+			"~/test-data/*": ["test/data/*"]
+		}
 	},
 	"include": ["src/**/*", "test/**/*", "typings/**/*.d.ts"]
 }