test: for ts path mapping

test/root3/README.md

@@ -0,0 +1,3 @@
+# root3
+
+This is a simple example for typescript monorepo, using [path mapping](https://www.typescriptlang.org/docs/handbook/module-resolution.html#path-mapping).

test/root3/packages/bar/index.ts

@@ -0,0 +1,8 @@
+import { doubleNumbers } from "@monorepo/foo";
+
+export const run = () => {
+  const value = doubleNumbers([1, 2, 3]);
+  return value;
+};
+
+console.log(run());

test/root3/packages/foo/hello.ts

@@ -0,0 +1,3 @@
+export const hello = (to: string) => {
+  console.log(`hello ${to}`)
+}

test/root3/packages/foo/index.ts

@@ -0,0 +1,10 @@
+/* The module name can be just './hello'.
+But '#foo/hello' is demonstration of "Path Mapping" of `tsconfig`
+and "Subpath imports"(defined in package.json's `imports` field) of node.js */
+import { hello } from "#foo/hello";
+// import { hello } from './hello' => this will work, too
+// import { hello } from '@monorepo/foo/hello' // => this will not work for tsc, without additional configuration on tsconfig.json
+
+hello("world");
+
+export const doubleNumbers = (data: number[]) => data.map((i) => i * 2);

test/root3/tsconfig.json

@@ -0,0 +1,27 @@
+{
+  "compilerOptions": {
+    "target": "ESNext",
+    "module": "CommonJS",
+    "rootDir": ".",
+    "baseUrl": "packages",
+    "paths": {
+     "@monorepo/*": ["*"],
+      "#foo/*": ["foo/*"],
+      "#bar/*": ["bar/*"],
+      "#*": ["*"]
+    },
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "removeComments": true,
+    "composite": true,
+    "declaration": true,
+    "declarationMap": true,
+    "sourceMap": true,
+    "esModuleInterop": true,
+    "incremental": true,
+    "resolveJsonModule": true
+  }
+}

test/test.js

@@ -518,6 +518,30 @@ describe('filing-cabinet', function() {
             assert.equal(result, path.join(directory, 'foo.ts'));
           });
         });
+        describe(`when the typescript's path mapping is configured`, function() {
+          it('should resolve the path', function() {
+            const result = cabinet({
+              partial: '#foo/hello',
+              filename: path.resolve(__dirname, 'root3', 'packages', 'foo', 'index.ts'),
+              directory: path.resolve(__dirname, 'root3'),
+              tsConfig: {
+                'compilerOptions': {
+                  'rootDir': '.',
+                  'baseUrl': 'packages',
+                  'paths': {
+                    '@monorepo/*': ['*'],
+                    '#foo/*': ['foo/*'],
+                    '#bar/*': ['bar/*'],
+                    '#*': ['*']
+                  },
+                },
+              },
+              tsConfigPath: path.resolve(__dirname, 'root3', 'tsconfig.json'),
+            });
+            const expected = path.resolve(__dirname, 'root3', 'packages', 'foo', 'hello.ts');
+            assert.equal(result, expected);
+          });
+        });
       });
 
       describe('when not given a tsconfig', function() {