feat: Add support for --main-fields esbuild option (#384)

Author: mildaniel

aws_lambda_builders/workflows/nodejs_npm_esbuild/esbuild.py

@@ -112,6 +112,7 @@ def run(self, args, cwd=None):
 SUPPORTED_ESBUILD_APIS_SINGLE_VALUE = [
     "target",
     "format",
+    "main-fields",
 ]
 
 # Multi-value types (--external:axios --external:aws-sdk)

tests/unit/workflows/nodejs_npm_esbuild/test_esbuild.py

@@ -200,6 +200,7 @@ def test_builds_args_from_config(self, osutils_mock):
             "target": "node14",
             "loader": [".proto=text", ".json=js"],
             "external": ["aws-sdk", "axios"],
+            "main-fields": "module,main",
         }
 
         args = (
@@ -213,6 +214,7 @@ def test_builds_args_from_config(self, osutils_mock):
                 "--minify",
                 "--target=node14",
                 "--format=esm",
+                "--main-fields=module,main",
                 "--external:aws-sdk",
                 "--external:axios",
                 "--loader:.proto=text",