Add test for module resolution with package json containing main field referencing js file in sub directory

tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.errors.txt

@@ -0,0 +1,14 @@
+/index.ts(1,19): error TS2307: Cannot find module 'foo'.
+
+
+==== /node_modules/foo/package.json (0 errors) ====
+    { "name": "foo", "version": "1.2.3", "main": "src/index.js" }
+    
+==== /node_modules/foo/src/index.d.ts (0 errors) ====
+    export const x: number;
+    
+==== /index.ts (1 errors) ====
+    import { x } from "foo";
+                      ~~~~~
+!!! error TS2307: Cannot find module 'foo'.
+    

tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.js

@@ -0,0 +1,15 @@
+//// [tests/cases/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.ts] ////
+
+//// [package.json]
+{ "name": "foo", "version": "1.2.3", "main": "src/index.js" }
+
+//// [index.d.ts]
+export const x: number;
+
+//// [index.ts]
+import { x } from "foo";
+
+
+//// [index.js]
+"use strict";
+exports.__esModule = true;

tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.symbols

@@ -0,0 +1,8 @@
+=== /node_modules/foo/src/index.d.ts ===
+export const x: number;
+>x : Symbol(x, Decl(index.d.ts, 0, 12))
+
+=== /index.ts ===
+import { x } from "foo";
+>x : Symbol(x, Decl(index.ts, 0, 8))
+

tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.trace.json

@@ -0,0 +1,37 @@
+[
+    "======== Resolving module 'foo' from '/index.ts'. ========",
+    "Module resolution kind is not specified, using 'NodeJs'.",
+    "Loading module 'foo' from 'node_modules' folder, target file type 'TypeScript'.",
+    "'package.json' does not have a 'typings' field.",
+    "'package.json' does not have a 'types' field.",
+    "'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.",
+    "Found 'package.json' at '/node_modules/foo/package.json'. Package ID is 'foo/src/i.d.ts@1.2.3'.",
+    "File '/node_modules/foo.ts' does not exist.",
+    "File '/node_modules/foo.tsx' does not exist.",
+    "File '/node_modules/foo.d.ts' does not exist.",
+    "'package.json' does not have a 'typings' field.",
+    "'package.json' does not have a 'types' field.",
+    "File '/node_modules/foo/index.ts' does not exist.",
+    "File '/node_modules/foo/index.tsx' does not exist.",
+    "File '/node_modules/foo/index.d.ts' does not exist.",
+    "Directory '/node_modules/@types' does not exist, skipping all lookups in it.",
+    "Loading module 'foo' from 'node_modules' folder, target file type 'JavaScript'.",
+    "'package.json' does not have a 'typings' field.",
+    "'package.json' does not have a 'types' field.",
+    "'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.",
+    "Found 'package.json' at '/node_modules/foo/package.json'. Package ID is 'foo/src/i.d.ts@1.2.3'.",
+    "File '/node_modules/foo.js' does not exist.",
+    "File '/node_modules/foo.jsx' does not exist.",
+    "'package.json' has 'main' field 'src/index.js' that references '/node_modules/foo/src/index.js'.",
+    "File '/node_modules/foo/src/index.js' does not exist.",
+    "Loading module as file / folder, candidate module location '/node_modules/foo/src/index.js', target file type 'JavaScript'.",
+    "File '/node_modules/foo/src/index.js.js' does not exist.",
+    "File '/node_modules/foo/src/index.js.jsx' does not exist.",
+    "File name '/node_modules/foo/src/index.js' has a '.js' extension - stripping it.",
+    "File '/node_modules/foo/src/index.js' does not exist.",
+    "File '/node_modules/foo/src/index.jsx' does not exist.",
+    "Directory '/node_modules/foo/src/index.js' does not exist, skipping all lookups in it.",
+    "File '/node_modules/foo/index.js' does not exist.",
+    "File '/node_modules/foo/index.jsx' does not exist.",
+    "======== Module name 'foo' was not resolved. ========"
+]

tests/baselines/reference/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.types

@@ -0,0 +1,8 @@
+=== /node_modules/foo/src/index.d.ts ===
+export const x: number;
+>x : number
+
+=== /index.ts ===
+import { x } from "foo";
+>x : any
+

tests/cases/compiler/moduleResolution_packageJson_yesAtPackageRoot_mainFieldInSubDirectory.ts

@@ -0,0 +1,10 @@
+// @traceResolution: true
+
+// @Filename: /node_modules/foo/package.json
+{ "name": "foo", "version": "1.2.3", "main": "src/index.js" }
+
+// @Filename: /node_modules/foo/src/index.d.ts
+export const x: number;
+
+// @Filename: /index.ts
+import { x } from "foo";