GenerateModuleJavaSpec: Replace string replace with string templates

Summary:
## Benefits:
- Improved Readability
- Improved type-safety with templates

Changelog: [Internal]

Differential Revision: D24386277

fbshipit-source-id: 28fbc0eab2c4455d391a1644b5c42c0cb39f69ad

packages/react-native-codegen/src/generators/modules/GenerateModuleJavaSpec.js

@@ -26,7 +26,18 @@ const {unwrapNullable} = require('../../parsers/flow/modules/utils');
 
 type FilesOutput = Map<string, string>;
 
-const moduleTemplate = `
+const FileTemplate = ({
+  packageName,
+  className,
+  methods,
+  imports,
+}: $ReadOnly<{|
+  packageName: string,
+  className: string,
+  methods: string,
+  imports: string,
+|}>) => {
+  return `
 /**
  * ${'C'}opyright (c) Facebook, Inc. and its affiliates.
  *
@@ -38,18 +49,19 @@ const moduleTemplate = `
  * @nolint
  */
 
-package ::_PACKAGENAME_::;
+package ${packageName};
 
-::_IMPORTS_::
+${imports}
 
-public abstract class ::_CLASSNAME_:: extends ReactContextBaseJavaModule implements ReactModuleWithSpec, TurboModule {
-  public ::_CLASSNAME_::(ReactApplicationContext reactContext) {
+public abstract class ${className} extends ReactContextBaseJavaModule implements ReactModuleWithSpec, TurboModule {
+  public ${className}(ReactApplicationContext reactContext) {
     super(reactContext);
   }
 
-::_METHODS_::
+${methods}
 }
 `;
+};
 
 function translateFunctionParamToJavaType(
   param: NativeModuleMethodParamSchema,
@@ -354,17 +366,15 @@ module.exports = {
 
       files.set(
         `${className}.java`,
-        moduleTemplate
-          .replace(
-            /::_IMPORTS_::/g,
-            Array.from(imports)
-              .sort()
-              .map(p => `import ${p};`)
-              .join('\n'),
-          )
-          .replace(/::_PACKAGENAME_::/g, packageName)
-          .replace(/::_CLASSNAME_::/g, className)
-          .replace(/::_METHODS_::/g, methods.filter(m => !!m).join('\n\n')),
+        FileTemplate({
+          packageName,
+          className,
+          methods: methods.filter(Boolean).join('\n\n'),
+          imports: Array.from(imports)
+            .sort()
+            .map(p => `import ${p};`)
+            .join('\n'),
+        }),
       );
     });