Implement transform output mode

Author: aomarks

CHANGELOG.md

@@ -8,7 +8,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## Unreleased
 
 - [BREAKING] The `tsOut` parameter is replaced by the new `output` object with
-  `mode: "runtime"`. Other outputs modes will follow.
+  `mode: "runtime"|"transform"`.
+
+- Add `transform` output mode, which emits an entire copy of the program in each
+  locale, where all `msg` calls have been replaced with the raw translated
+  template for that locale.
 
 - Add ability to generate a `setLocale` function by setting
   `output.exportSetLocaleFunction: true`.

src/outputters/runtime.ts

@@ -14,6 +14,7 @@ import {applyPatches, Patches} from '../patches';
 import {Locale} from '../locales';
 import {Config} from '../config';
 import {KnownError} from '../error';
+import {escapeStringLiteral} from '../typescript';
 import * as fs from 'fs';
 import * as pathLib from 'path';
 
@@ -460,14 +461,3 @@ function makeMessageString(
     return msgStr;
   }
 }
-
-/**
- * Escape a string such that it can be safely embedded in a JavaScript template
- * literal (backtick string).
- */
-function escapeStringLiteral(unescaped: string): string {
-  return unescaped
-    .replace(`\\`, `\\\\`)
-    .replace('`', '\\`')
-    .replace('$', '\\$');
-}