Add devcontainer helpers for managing dependencies.

.devcontainer/devcontainer.json

@@ -18,9 +18,6 @@
 		"ghcr.io/devcontainers/features/node:1": {}
 	},
 
-	"settings": {
-	},
-
 	"customizations": {
 		"vscode": {
 			"extensions": [
@@ -29,5 +26,7 @@
 				"golang.go"
 			]
 		}
-	}
+	},
+
+	"postStartCommand": ".devcontainer/post-start-command.sh"
 }

.devcontainer/post-start-command.sh

@@ -0,0 +1,10 @@
+#!/bin/bash -eu
+
+# Install NPM dependencies to node_modules. Enables type completion.
+# Remove extraneous packages.
+pnpm install
+pnpm prune
+
+# Initiate build. Enables type completion for generated files.
+# Don't bother cleaning, as Bazel provides hermetic/repeatable builds.
+bazel build --keep_going ...

.vscode/refresh-dependencies.sh

@@ -0,0 +1,13 @@
+#!/bin/bash -eux
+
+cd $(dirname $0)/..
+
+# NPM dependencies
+pnpm install
+
+# Incorporate new dependencies in go.mod
+bazel run @go_sdk//:bin/go -- mod tidy
+bazel run //:gazelle-update-repos
+
+# Add any new dependencies in sources to BUILD files
+bazel run //:gazelle

.vscode/tasks.json

@@ -0,0 +1,19 @@
+{
+  // See https://go.microsoft.com/fwlink/?LinkId=733558
+  // for the documentation about the tasks.json format
+  "version": "2.0.0",
+  "tasks": [
+    {
+      "label": "Refresh Dependencies",
+      "type": "shell",
+      "command": "./.vscode/refresh-dependencies.sh",
+      "problemMatcher": [],
+      "presentation": {
+        "reveal": "always",
+        "panel": "dedicated",
+        "focus": true,
+        "clear": true,
+      }
+    }
+  ]
+}