Ensure that JSON files are included in build module resolution (#905)

src/instances.ts

@@ -351,6 +351,13 @@ export function initializeInstance(
 }
 
 function getScriptRegexp(instance: TSInstance) {
+  // If resolveJsonModules is set, we should accept json files
+  if (instance.configParseResult.options.resolveJsonModule) {
+    // if allowJs is set then we should accept js(x) files
+    return instance.configParseResult.options.allowJs === true
+      ? /\.tsx?$|\.json$|\.jsx?$/i
+      : /\.tsx?$|\.json$/i;
+  }
   // if allowJs is set then we should accept js(x) files
   return instance.configParseResult.options.allowJs === true
     ? /\.tsx?$|\.jsx?$/i

test/comparison-tests/resolveJsonModule/app.ts

@@ -0,0 +1,3 @@
+import * as file from "./file.json";
+
+console.log(file.foo);

test/comparison-tests/resolveJsonModule/expectedOutput-3.8/output.txt

@@ -0,0 +1,17 @@
+    Asset      Size  Chunks  Chunk Names
+bundle.js  1.12 KiB       0  main
+Entrypoint main = bundle.js
+[0] ./app.ts 232 bytes {0} [built] [failed] [2 errors]
+
+WARNING in configuration
+The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.
+You can also set it to 'none' to disable any default behavior. Learn more: https://webpack.js.org/concepts/mode/
+
+ERROR in tsconfig.json
+[tsl] ERROR
+      TS18003: No inputs were found in config file 'tsconfig.json'. Specified 'include' paths were '["ap.ts","file.json"]' and 'exclude' paths were '[]'.
+
+ERROR in ./app.ts
+Module build failed (from index.js):
+Error: error while parsing tsconfig.json
+    at Object.loader (dist/index.js:19:18)

test/comparison-tests/resolveJsonModule/expectedOutput-transpile-3.8/output.txt

@@ -0,0 +1,17 @@
+    Asset      Size  Chunks  Chunk Names
+bundle.js  1.12 KiB       0  main
+Entrypoint main = bundle.js
+[0] ./app.ts 232 bytes {0} [built] [failed] [2 errors]
+
+WARNING in configuration
+The 'mode' option has not been set, webpack will fallback to 'production' for this value. Set 'mode' option to 'development' or 'production' to enable defaults for each environment.
+You can also set it to 'none' to disable any default behavior. Learn more: https://webpack.js.org/concepts/mode/
+
+ERROR in tsconfig.json
+[tsl] ERROR
+      TS18003: No inputs were found in config file 'tsconfig.json'. Specified 'include' paths were '["ap.ts","file.json"]' and 'exclude' paths were '[]'.
+
+ERROR in ./app.ts
+Module build failed (from index.js):
+Error: error while parsing tsconfig.json
+    at Object.loader (dist/index.js:19:18)

test/comparison-tests/resolveJsonModule/file.json

@@ -0,0 +1,3 @@
+{
+  "foo": "bar"
+}

test/comparison-tests/resolveJsonModule/tsconfig.json

@@ -0,0 +1,7 @@
+{
+  "compilerOptions": {
+    "resolveJsonModule": true,
+    "composite": true
+  },
+  "include": ["ap.ts", "file.json"]
+}

test/comparison-tests/resolveJsonModule/webpack.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  entry: './app.ts',
+  output: {
+    filename: 'bundle.js'
+  },
+  resolve: {
+    extensions: ['.ts', '.json']
+  },
+  module: {
+    rules: [{ test: /\.tsx?$/, loader: 'ts-loader' }]
+  }
+};