From 622e593384ea111c74956e2a4373664bc334bfd6 Mon Sep 17 00:00:00 2001
From: Toru Kobayashi <koba0004@gmail.com>
Date: Thu, 31 Oct 2019 19:39:14 +0900
Subject: [PATCH] fix: print compile warnings

---
 src/commands/buildJs.ts | 11 ++++++++++-
 src/commands/serve.ts   |  4 ++--
 src/compiler-core.ts    | 25 +++++++++++++++++++------
 3 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/src/commands/buildJs.ts b/src/commands/buildJs.ts
index 01bc07320..2cfeceeef 100644
--- a/src/commands/buildJs.ts
+++ b/src/commands/buildJs.ts
@@ -72,12 +72,21 @@ export async function buildJs(
         }
 
         logWithCount(entryConfigPath, runningJobCount++, "Compiling");
-        const outputs = await compileFn(options);
+        const [outputs, warnings] = await compileFn(options);
         const promises = outputs.map(async output => {
           await mkdir(path.dirname(output.path), { recursive: true });
           return writeFile(output.path, output.src);
         });
         await Promise.all(promises);
+        if (warnings && warnings.length > 0) {
+          warnings
+            .filter(warn => warn.key)
+            .forEach(warn => {
+              console.error(`[${warn.key}]${warn.description}`);
+              console.error(`${warn.line}:${warn.column} ${warn.source}`);
+              console.error(warn.context);
+            });
+        }
         logWithCount(entryConfigPath, completedJobCount++, "Compiled");
       } catch (e) {
         logWithCount(entryConfigPath, completedJobCount++, "Failed");
diff --git a/src/commands/serve.ts b/src/commands/serve.ts
index 5c841afbe..bb52020d4 100644
--- a/src/commands/serve.ts
+++ b/src/commands/serve.ts
@@ -201,7 +201,7 @@ export async function serve(config: DuckConfig, watch = true) {
       createModuleUris
     );
     updateDepsJsCache(config);
-    const chunkOutputs = await compileToJson(options);
+    const [chunkOutputs] = await compileToJson(options);
     const chunkIdToOutput: { [id: string]: CompilerOutput } = {};
     sortedChunkIds.forEach((id, index) => {
       chunkIdToOutput[id] = chunkOutputs[index];
@@ -231,7 +231,7 @@ export async function serve(config: DuckConfig, watch = true) {
     duckConfig: DuckConfig
   ) {
     const options = createCompilerOptionsForPage(entryConfig, duckConfig, false);
-    const compileOutputs = await compileToJson(options);
+    const [compileOutputs] = await compileToJson(options);
     if (compileOutputs.length !== 1) {
       throw new Error(
         `Unexpectedly chunkOutputs.length must be 1, but actual ${compileOutputs.length}`
diff --git a/src/compiler-core.ts b/src/compiler-core.ts
index b3a84faaa..7ac1fe804 100644
--- a/src/compiler-core.ts
+++ b/src/compiler-core.ts
@@ -59,29 +59,42 @@ export interface CompilerOutput {
   source_map: string;
 }
 
+export interface WarningOoutput {
+  line: number;
+  column: number;
+  description: string;
+  key: string;
+  context: string;
+  source: string;
+}
+
 /**
  * @throws If compiler throws errors
  */
 export async function compileToJson(
   extendedOpts: ExtendedCompilerOptions
-): Promise<CompilerOutput[]> {
+): Promise<[CompilerOutput[], WarningOoutput[]]> {
   extendedOpts.compilerOptions = {
     ...extendedOpts.compilerOptions,
     json_streams: "OUT",
     error_format: "JSON",
   };
-  const outputs: CompilerOutput[] = JSON.parse(await compile(extendedOpts));
+  const { stdout, stderr } = await compile(extendedOpts);
+  const outputs: CompilerOutput[] = JSON.parse(stdout);
+  const warnings: WarningOoutput[] = stderr ? JSON.parse(stderr) : [];
   if (extendedOpts.batch) {
     // Reduce transfer size in batch mode.
     // The maximum request/response size of AWS Lambda is 6MB each.
     // See https://faastjs.org/docs/aws#queue-vs-https-mode
-    return outputs.map(({ path, src }) => ({ path, src, source_map: "" }));
+    return [outputs.map(({ path, src }) => ({ path, src, source_map: "" })), warnings];
   } else {
-    return outputs;
+    return [outputs, warnings];
   }
 }
 
-async function compile(extendedOpts: ExtendedCompilerOptions): Promise<string> {
+async function compile(
+  extendedOpts: ExtendedCompilerOptions
+): Promise<{ stdout: string; stderr?: string }> {
   let opts = extendedOpts.compilerOptions;
   if (isInAwsLambda()) {
     rewriteNodePathForAwsLambda(opts);
@@ -108,7 +121,7 @@ async function compile(extendedOpts: ExtendedCompilerOptions): Promise<string> {
       if (exitCode !== 0) {
         return reject(new CompilerError(stderr || "No stderr", exitCode));
       }
-      resolve(stdout);
+      resolve({ stdout, stderr });
     });
   });
 }