fix: add //go:build !js to postgres wrapper to fix tinygo/wasm compilation

[kalbasit]

The postgres wrapper imports github.com/lib/pq which uses TLS and
crypto APIs unavailable in tinygo's stdlib. Adding the !js build tag
excludes the postgres wrapper when building for wasm targets.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

[gemini-code-assist]

Summary of Changes

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This pull request resolves a compilation failure for projects targeting WebAssembly (WASM) with TinyGo when using the Postgres database wrapper. By conditionally applying a build constraint, the Postgres-specific code, which relies on incompatible TLS and crypto APIs, is now correctly excluded from WASM builds, enhancing the tool's compatibility across different environments.

Highlights

• Postgres Wrapper Compilation Fix: A //go:build !js build tag was added to the Postgres wrapper template. This change prevents compilation errors when building for WebAssembly (WASM) targets using TinyGo, as the github.com/lib/pq dependency uses TLS and crypto APIs not available in TinyGo's standard library for WASM.

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[gemini-code-assist]

Code Review

This pull request aims to fix a tinygo/wasm compilation issue for the postgres wrapper by adding a //go:build !js build tag. The approach is correct, but the implementation in the Go template has a whitespace issue that makes the build tag invalid. I've provided a critical review comment with a code suggestion to fix the template logic, ensuring the build tag is generated correctly while maintaining clean formatting for all database engines.

[gemini-code-assist]

The whitespace control in this template block is incorrect. The {{- if on the first line will remove the preceding newline, causing the //go:build directive to be appended to the // Code generated by sqlc-multi-db. DO NOT EDIT. comment. This makes the build tag ineffective as it's no longer on its own line at the top of the file.

I've adjusted the template's whitespace handling to ensure the build tag is correctly placed on a new line and that there is a single blank line separating it from the package declaration, which is required by the Go toolchain. This fix also ensures that non-postgres generated files maintain clean formatting.

Suggested change

	{{- if .Engine.IsPostgres}}
	//go:build !js
	{{end -}}
	{{if .Engine.IsPostgres}}
	//go:build !js
	{{- end -}}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 28.83%. Comparing base (0c497ea) to head (b9a21a0).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main       #9   +/-   ##
=======================================
  Coverage   28.83%   28.83%           
=======================================
  Files           6        6           
  Lines         697      697           
=======================================
  Hits          201      201           
  Misses        485      485           
  Partials       11       11           

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