Provide compiled JSON to TypeScript compiler. (#4404)

Fixes #4101

Previously, we would just provide the raw JSON to the TypeScript
compiler worker, but TypeScript does not transform JSON.  This caused
a problem when emitting a bundle, that the JSON would just be "inlined"
into the output, instead of being transformed into a module.

This fixes this problem by providing the compiled JSON to the TypeScript
compiler, so TypeScript just sees JSON as a "normal" TypeScript module.

1 files changed, 3 insertions, 3 deletions

diff --git a/cli/js/compiler/util.ts b/cli/js/compiler/util.ts
index 09725fc22..8acc83a2d 100644
--- a/cli/js/compiler/util.ts
+++ b/cli/js/compiler/util.ts
@@ -4,7 +4,7 @@ import { bold, cyan, yellow } from "../colors.ts";
 import { CompilerOptions } from "./api.ts";
 import { buildBundle } from "./bundler.ts";
 import { ConfigureResponse, Host } from "./host.ts";
-import { SourceFile } from "./sourcefile.ts";
+import { MediaType, SourceFile } from "./sourcefile.ts";
 import { atob, TextEncoder } from "../web/text_encoding.ts";
 import * as compilerOps from "../ops/compiler.ts";
 import * as util from "../util.ts";
@@ -51,13 +51,13 @@ function cache(
     // NOTE: If it's a `.json` file we don't want to write it to disk.
     // JSON files are loaded and used by TS compiler to check types, but we don't want
     // to emit them to disk because output file is the same as input file.
-    if (sf.extension === ts.Extension.Json) {
+    if (sf.mediaType === MediaType.Json) {
       return;
     }
 
     // NOTE: JavaScript files are only cached to disk if `checkJs`
     // option in on
-    if (sf.extension === ts.Extension.Js && !checkJs) {
+    if (sf.mediaType === MediaType.JavaScript && !checkJs) {
       return;
     }
   }