From b3400d822f6e9a1100e693cc06cd09c8249d4422 Mon Sep 17 00:00:00 2001
From: Ryan Dahl <ry@tinyclouds.org>
Date: Thu, 25 Oct 2018 11:00:14 -0400
Subject: Decode main.js.map during snapshotting.

Pro:
time ./out/debug/deno tests/error_001.ts  3.0s -> 0.4s

Con:
time ./tool/build.py snapshot              33s -> 1m52s
out/debug/gen/snapshot_deno.bin            39M -> 121M
---
 js/compiler.ts | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'js/compiler.ts')

diff --git a/js/compiler.ts b/js/compiler.ts
index 941691f5c..a6b6e6970 100644
--- a/js/compiler.ts
+++ b/js/compiler.ts
@@ -388,6 +388,7 @@ export class DenoCompiler
     let lastModule: ModuleMetaData | undefined;
     sourceMaps.install({
       installPrepareStackTrace: true,
+
       getGeneratedContents: (fileName: string): string | RawSourceMap => {
         this._log("compiler.getGeneratedContents", fileName);
         if (fileName === "gen/bundle/main.js") {
@@ -419,6 +420,11 @@ export class DenoCompiler
         }
       }
     });
+    // Pre-compute source maps for main.js.map. This will happen at compile-time
+    // as long as Compiler is instanciated before the snapshot is created..
+    const consumer = sourceMaps.loadConsumer("gen/bundle/main.js");
+    assert(consumer != null);
+    consumer!.computeColumnSpans();
   }
 
   private constructor() {
-- 
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