Merge pull request #26457 from Microsoft/baseUrlPathMappingResolveJsonModule

Do not include json file unless --resolveJsonModule is specified

src/compiler/diagnosticMessages.json

@@ -3941,6 +3941,10 @@
         "category": "Error",
         "code": 7041
     },
+    "Module '{0}' was resolved to '{1}', but '--resolveJsonModule' is not used.": {
+        "category": "Error",
+        "code": 7042
+    },
     "You cannot rename this element.": {
         "category": "Error",
         "code": 8000
@@ -4576,4 +4580,4 @@
      "category": "Message",
          "code": 95066
     }
-}
+}

src/compiler/program.ts

@@ -2849,7 +2849,6 @@ namespace ts {
         switch (extension) {
             case Extension.Ts:
             case Extension.Dts:
-            case Extension.Json: // Since module is resolved to json file only when --resolveJsonModule, we dont need further check
                 // These are always allowed.
                 return undefined;
             case Extension.Tsx:
@@ -2858,6 +2857,8 @@ namespace ts {
                 return needJsx() || needAllowJs();
             case Extension.Js:
                 return needAllowJs();
+            case Extension.Json:
+                return needResolveJsonModule();
         }
 
         function needJsx() {
@@ -2866,6 +2867,9 @@ namespace ts {
         function needAllowJs() {
             return options.allowJs || !getStrictOptionValue(options, "noImplicitAny") ? undefined : Diagnostics.Could_not_find_a_declaration_file_for_module_0_1_implicitly_has_an_any_type;
         }
+        function needResolveJsonModule() {
+            return options.resolveJsonModule ? undefined : Diagnostics.Module_0_was_resolved_to_1_but_resolveJsonModule_is_not_used;
+        }
     }
 
     function getModuleNames({ imports, moduleAugmentations }: SourceFile): string[] {

tests/baselines/reference/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.errors.txt

@@ -0,0 +1,23 @@
+/a.ts(1,20): error TS7042: Module 'foo/bar/foobar.json' was resolved to '/node_modules/foo/bar/foobar.json', but '--resolveJsonModule' is not used.
+
+
+==== /tsconfig.json (0 errors) ====
+    {
+        "compilerOptions": {
+            "baseUrl": ".",
+            "paths": {
+                "*": ["node_modules/*", "src/types"]
+            },
+            "allowJs": true,
+            "outDir": "bin"
+        }
+    }
+    
+==== /a.ts (1 errors) ====
+    import foobar from "foo/bar/foobar.json";
+                       ~~~~~~~~~~~~~~~~~~~~~
+!!! error TS7042: Module 'foo/bar/foobar.json' was resolved to '/node_modules/foo/bar/foobar.json', but '--resolveJsonModule' is not used.
+    
+==== /node_modules/foo/bar/foobar.json (0 errors) ====
+    { "a": 10 }
+    

tests/baselines/reference/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.js

@@ -0,0 +1,12 @@
+//// [tests/cases/compiler/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.ts] ////
+
+//// [foobar.json]
+{ "a": 10 }
+
+//// [a.ts]
+import foobar from "foo/bar/foobar.json";
+
+
+//// [/bin/a.js]
+"use strict";
+exports.__esModule = true;

tests/baselines/reference/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.symbols

@@ -0,0 +1,4 @@
+=== /a.ts ===
+import foobar from "foo/bar/foobar.json";
+>foobar : Symbol(foobar, Decl(a.ts, 0, 6))
+

tests/baselines/reference/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.trace.json

@@ -0,0 +1,10 @@
+[
+    "======== Resolving module 'foo/bar/foobar.json' from '/a.ts'. ========",
+    "Module resolution kind is not specified, using 'NodeJs'.",
+    "'baseUrl' option is set to '/', using this value to resolve non-relative module name 'foo/bar/foobar.json'.",
+    "'paths' option is specified, looking for a pattern to match module name 'foo/bar/foobar.json'.",
+    "Module name 'foo/bar/foobar.json', matched pattern '*'.",
+    "Trying substitution 'node_modules/*', candidate module location: 'node_modules/foo/bar/foobar.json'.",
+    "File '/node_modules/foo/bar/foobar.json' exist - use it as a name resolution result.",
+    "======== Module name 'foo/bar/foobar.json' was successfully resolved to '/node_modules/foo/bar/foobar.json'. ========"
+]

tests/baselines/reference/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.types

@@ -0,0 +1,4 @@
+=== /a.ts ===
+import foobar from "foo/bar/foobar.json";
+>foobar : any
+

tests/cases/compiler/requireOfJsonFileWithoutResolveJsonModuleAndPathMapping.ts

@@ -0,0 +1,24 @@
+// @noImplicitReferences: true
+// @traceResolution: true
+// @allowJs: true
+// @esModuleInterop: true
+// @fullEmitPaths: true
+// @resolveJsonModule: false
+
+// @Filename: /node_modules/foo/bar/foobar.json
+{ "a": 10 }
+
+// @Filename: /a.ts
+import foobar from "foo/bar/foobar.json";
+
+// @Filename: /tsconfig.json
+{
+    "compilerOptions": {
+        "baseUrl": ".",
+        "paths": {
+            "*": ["node_modules/*", "src/types"]
+        },
+        "allowJs": true,
+        "outDir": "bin"
+    }
+}