Move the samples over

[danieljbruce]

CI experiment

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

• Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
• Ensure the tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Code Review

This pull request introduces a comprehensive set of Node.js samples for Cloud Spanner, including archived versions, along with configuration files like .eslintrc.yml, package.json, and an auto-generated README.md. The review comments highlight several critical issues: incorrect handling of the exists() promise return value in backups-delete.js and instance-config-delete.js (which returns an array rather than a direct boolean), broken relative require paths in datatypes.js, and misplaced OpenTelemetry dependencies in package.json that should be under dependencies instead of devDependencies. Additionally, minor typos and a duplicate entry were identified in the README.md file.

[gemini-code-assist]

The backup.exists() method returns a Promise<[boolean]>, so the exists variable will be an array (e.g., [true] or [false]). The condition if (exists) will always evaluate to true because an array is a truthy value. The check should be on the first element of the array.

  if (exists[0]) {

[gemini-code-assist]

The require paths for the numeric and json samples are incorrect. They are pointing to the parent directory (../) instead of the current directory (./). This will cause the sample to fail when run.

Suggested change

	const {updateWithNumericData} = require('../numeric-update-data');
	const {queryWithNumericParameter} = require('../numeric-query-parameter');
	const {addJsonColumn} = require('./json-add-column');
	const {updateWithJsonData} = require('../json-update-data');
	const {queryWithJsonParameter} = require('../json-query-parameter');
	const {updateWithNumericData} = require('./numeric-update-data');
	const {queryWithNumericParameter} = require('./numeric-query-parameter');
	const {addJsonColumn} = require('./json-add-column');
	const {updateWithJsonData} = require('./json-update-data');
	const {queryWithJsonParameter} = require('./json-query-parameter');

[gemini-code-assist]

The instanceConfig.exists() method returns a Promise<[boolean]>, so the exists variable will be an array (e.g., [true] or [false]). The condition if (exists) will always evaluate to true because an array is a truthy value. The check should be on the first element of the array.

      if (exists[0]) {

[gemini-code-assist]

The OpenTelemetry packages are used directly in the observability samples (observability-traces.js, observability-traces-otlp.js), so they should be listed under dependencies instead of devDependencies. This ensures they are installed for users who want to run these samples from the published package.

[gemini-code-assist]

There's a duplicate entry for "Copies a source backup" in the table of contents. This line is identical to the previous one.

[gemini-code-assist]

There appears to be a typo in the usage command. ppg-numeric-data-type.js should likely be pg-numeric-data-type.js.

Suggested change

	`node ppg-numeric-data-type.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>`
	node pg-numeric-data-type.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>

[gemini-code-assist]

There's a typo in the filename in the usage command. It has a double .js.js extension.

Suggested change

	`node table-create-with-foreign-key-delete-cascade.js.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>`
	node table-create-with-foreign-key-delete-cascade.js <INSTANCE_ID> <DATABASE_ID> <PROJECT_ID>