Downgrade mocha to a version before it knew about ESM...

Author: nomcopter

.mocharc.js

@@ -0,0 +1,13 @@
+require('jsdom-global/register');
+require('ts-node').register({
+  transpileOnly: true,
+});
+
+const mock = require('mock-require');
+mock('rdndmb-html5-to-touch', {});
+mock('react-dnd', {});
+mock('react-dnd-multi-backend', {});
+
+module.exports = {
+  spec: 'test/*.ts',
+};

package.json

@@ -5,6 +5,7 @@
   "license": "Apache-2.0",
   "main": "lib/index.js",
   "style": "lib/react-mosaic.css",
+  "type": "commonjs",
   "typings": "lib/index.d.ts",
   "repository": {
     "type": "git",
@@ -32,7 +33,7 @@
     "prettier:run": "prettier 'styles/*.less' '*.md' '{,.}*.yml' '.circleci/*.yml'",
     "test": "npm-run-all build -lp test:**",
     "test:lint": "tslint -c tslint.yml -p tsconfig.json -e test",
-    "test:unit": "mocha --opts test/mocha.opts 'test/*.ts'",
+    "test:unit": "mocha",
     "test:format": "yarn run prettier:run --list-different",
     "fix": "npm-run-all -lp fix:**",
     "fix:format": "yarn run prettier:run --write",
@@ -75,8 +76,9 @@
     "less": "^3.13.1",
     "less-loader": "^11.1.0",
     "less-plugin-autoprefix": "^2.0.0",
-    "mocha": "^7.2.0",
+    "mocha": "^6.2.3",
     "mocha-junit-reporter": "^1.23.3",
+    "mock-require": "^3.0.3",
     "npm-run-all": "^4.1.5",
     "prettier": "^2.6.1",
     "react": "^18.2.0",
@@ -85,7 +87,7 @@
     "source-map-loader": "^4.0.1",
     "style-loader": "^3.3.1",
     "ts-loader": "^9.4.2",
-    "ts-node": "^8.10.2",
+    "ts-node": "^10.9.1",
     "tslint": "^6.1.3",
     "tslint-config-prettier": "^1.18.0",
     "tslint-plugin-prettier": "^2.3.0",

test/mocha.opts

@@ -7,6 +7,8 @@
     "forceConsistentCasingInFileNames": true,
     "jsx": "react",
     "lib": ["dom", "es5", "scripthost", "es2015.promise"],
+    "moduleResolution": "node",
+    "module": "commonjs",
     "noEmit": true,
     "noFallthroughCasesInSwitch": true,
     "noImplicitReturns": true,
@@ -17,9 +19,5 @@
     "sourceMap": true,
     "strict": true
   },
-  "exclude": [
-    "docs",
-    "lib",
-    "node_modules"
-  ]
+  "exclude": ["docs", "lib", "node_modules"],
 }