fix: comments are removed from JSONC files

cli/deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@molt/cli",
-  "version": "0.19.0",
+  "version": "0.19.1",
   "exports": {
     ".": "./main.ts"
   },

core/deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@molt/core",
-  "version": "0.19.0",
+  "version": "0.19.1",
   "exports": {
     ".": "./mod.ts",
     "./bumps": "./bumps.ts",

core/refs.ts

@@ -2,7 +2,7 @@ import { init, parseModule } from "@deno/graph";
 import type { DependencyJson } from "@deno/graph/types";
 import { toUrl } from "@molt/lib/path";
 import { distinct } from "@std/collections";
-import { detect, EOL, format } from "@std/fs/eol";
+import { detect, EOL } from "@std/fs/eol";
 import { extname } from "@std/path";
 import { type DependencySpec, parse, stringify, tryParse } from "./specs.ts";
 import { parseImportMapJson, readImportMapJson } from "./maps.ts";
@@ -157,21 +157,30 @@ function rewriteEsModule(
   return lines.join(eol);
 }
 
+// This implementation is not quite efficient nor 100% robust, but we don't
+// have a good way to deal with JSONC within the Deno ecosystem yet.
 function rewriteImportMap(
   ref: DependencyRef<"import_map">,
   updated: DependencySpec,
   content: string,
 ) {
   const src = ref.source;
   const json = parseImportMapJson(content);
-  if (src.scope) {
-    json.scopes![src.scope][src.key] = stringify(updated);
-  } else {
-    json.imports![src.key] = stringify(updated);
-  }
-  const str = JSON.stringify(json, null, 2);
+
+  const key = src.scope
+    ? json.scopes![src.scope][src.key]
+    : json.imports![src.key];
+
   const eol = detect(content) ?? EOL;
-  return format(str, eol) + eol;
+  const lines = content.split(eol);
+
+  const outdated = stringify(ref.dependency);
+  const index = lines.findIndex(
+    (line) => line.includes(key) && line.includes(outdated),
+  );
+  lines[index] = lines[index].replace(outdated, stringify(updated));
+
+  return lines.join(eol);
 }
 
 /** Options for committing the updated dependency. */

core/refs_test.ts

@@ -242,11 +242,12 @@ describe("rewrite", () => {
     );
   });
 
-  it("should rewrite dependencies in an import map", async () => {
+  it("should rewrite dependencies in deno.jsonc", async () => {
     await Deno.writeTextFile(
       "a.json",
       dedent`
         {
+          // dependencies
           "imports": {
             "@std/assert": "jsr:@std/assert@^0.222.0",
             "@std/testing/bdd": "jsr:@std/testing@^0.222.0/bdd"
@@ -260,6 +261,7 @@ describe("rewrite", () => {
       await Deno.readTextFile("a.json"),
       dedent`
         {
+          // dependencies
           "imports": {
             "@std/assert": "jsr:@std/assert@0.224.0",
             "@std/testing/bdd": "jsr:@std/testing@^0.222.0/bdd"
@@ -272,6 +274,7 @@ describe("rewrite", () => {
       await Deno.readTextFile("a.json"),
       dedent`
         {
+          // dependencies
           "imports": {
             "@std/assert": "jsr:@std/assert@0.224.0",
             "@std/testing/bdd": "jsr:@std/testing@0.224.0/bdd"