Create a command to export Firebase Functions' IaC

[inlined]

Checkpointing a work in progress for an experimental feature to export Functions' IaC. This can be used to eventually support management via Terraform or the Application Design Center.

[gemini-code-assist]

Summary of Changes

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This pull request introduces an experimental feature to export Firebase Cloud Functions' Infrastructure as Code (IaC). The primary goal is to provide a mechanism for managing functions through external tools like Terraform or Application Design Center by generating a manifest of the functions' configuration. This initial checkpoint focuses on establishing the command-line interface and the foundational logic for manifest generation, with support for different output formats planned for future iterations.

Highlights

• New functions:export command: A new experimental command functions:export has been introduced, allowing users to export Firebase Cloud Functions' Infrastructure as Code (IaC). This command supports specifying an output format (currently only 'internal' is implemented) and an optional codebase.
• Experimental Feature Flag: The functions:export command is gated behind a new experimental flag, functionsexport, indicating it is a work in progress and not yet publicly available.
• Core Export Logic: A new utility function, getFunctionsManifest, was added to handle the core logic of discovering and building the functions manifest, leveraging existing runtime delegates and environment variable loading.

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Changelog

• src/commands/functions-export.ts
  • Added a new command definition for functions:export.
• src/commands/index.ts
  • Conditionally registered the new functions:export command under the client.functions namespace, dependent on the functionsexport experiment flag.
• src/deploy/functions/export.ts
  • Added the getFunctionsManifest function, which orchestrates the discovery and building of the functions manifest.
• src/experiments.ts
  • Introduced a new experimental flag functionsexport to control the visibility and availability of the functions IaC export feature.

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[gemini-code-assist]

Code Review

This pull request introduces an experimental feature to export Firebase Functions' Infrastructure as Code (IaC). The changes include a new command functions:export, its integration into the CLI, and the underlying logic to generate the manifest. The implementation correctly handles different output formats and codebase selections. A minor improvement opportunity was identified regarding the use of console.log for user-facing output, which violates the established style guide.

[gemini-code-assist]

The repository's style guide (line 29) explicitly states to "Use the central logger (src/logger.ts); never use console.log() for user-facing output." Please replace console.log with logger.info or logger.debug as appropriate for user-facing output.

For example, logger.info(Manifest file: ${clc.bold(file)}); and logger.info(contents);

      logger.info(`Manifest file: ${clc.bold(file)}`);
      logger.info(contents);

[inlined]

My update changes so much that I might as well create a fresh review.