From 09bd66272a0c0f60341abe276cc17a2e29f738e7 Mon Sep 17 00:00:00 2001
From: Matt Mackay <mattem@gmail.com>
Date: Sun, 9 May 2021 08:35:27 -0400
Subject: [PATCH] feat(esbuild): default log-level flag to warning, unless
 overridden

---
 packages/esbuild/esbuild.bzl                | 15 +++++++++++++--
 packages/esbuild/test/splitting/BUILD.bazel |  7 ++++++-
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/packages/esbuild/esbuild.bzl b/packages/esbuild/esbuild.bzl
index 1a14ebf50a..12247e2d8b 100644
--- a/packages/esbuild/esbuild.bzl
+++ b/packages/esbuild/esbuild.bzl
@@ -62,7 +62,6 @@ def _esbuild_impl(ctx):
     args.add("--preserve-symlinks")
     args.add_joined(["--platform", ctx.attr.platform], join_with = "=")
     args.add_joined(["--target", ctx.attr.target], join_with = "=")
-    args.add_joined(["--log-level", "info"], join_with = "=")
     args.add_joined(["--metafile", metafile.path], join_with = "=")
     args.add_all(ctx.attr.define, format_each = "--define:%s")
     args.add_all(ctx.attr.external, format_each = "--external:%s")
@@ -111,7 +110,19 @@ def _esbuild_impl(ctx):
     args.add_joined(["--tsconfig", jsconfig_file.path], join_with = "=")
     inputs.append(jsconfig_file)
 
-    args.add_all([ctx.expand_location(arg) for arg in ctx.attr.args])
+    log_level_flag = "--log-level"
+    has_log_level_flag = False
+    for arg in ctx.attr.args:
+        if arg.startswith(log_level_flag):
+            has_log_level_flag = True
+
+        args.add(ctx.expand_location(arg))
+
+    # by default the log level is "info" and includes an output file summary
+    # under bazel this is slightly redundant and may lead to spammy logs
+    # unless the user overrides the log level, set it to only show warnings and errors
+    if not has_log_level_flag:
+        args.add_joined([log_level_flag, "warning"], join_with = "=")
 
     env = {}
     if ctx.attr.max_threads > 0:
diff --git a/packages/esbuild/test/splitting/BUILD.bazel b/packages/esbuild/test/splitting/BUILD.bazel
index 7b0f622bff..70a146e551 100644
--- a/packages/esbuild/test/splitting/BUILD.bazel
+++ b/packages/esbuild/test/splitting/BUILD.bazel
@@ -16,7 +16,12 @@ ts_library(
 
 esbuild(
     name = "bundle",
-    args = ["--keep-names"],
+    args = [
+        # info log level may be helpful when splitting as esbuild will show each file emitted
+        # where as bazel will only list the output directory
+        "--log-level=info",
+        "--keep-names",
+    ],
     entry_point = "main.ts",
     output_dir = True,
     deps = [":main"],