feat(compass-collection): Mongosh Script Generation Engine - CLOUDP-333860

[jcobis]

Description

Implement the mongosh script generation engine that creates an executable script based on the faker schema. The script will generate and upload mock data.

Checklist

• New tests and/or benchmarks are included
• Documentation is changed or added
• If this change updates the UI, screenshots/videos are added and a design review is requested
• I have signed the MongoDB Contributor License Agreement (https://www.mongodb.com/legal/contributor-agreement)

Types of changes

• Backport Needed
• Patch (non-breaking change which fixes an issue)
• Minor (non-breaking change which adds functionality)
• Major (fix or feature that would cause existing functionality to change)

[Copilot]

Pull Request Overview

This PR implements a mongosh script generation engine that creates executable scripts for generating and uploading mock data based on faker schemas. The engine supports complex nested structures, arrays, probabilistic fields, and configurable array lengths.

• Core script generation functionality with support for nested objects, arrays, and multi-dimensional arrays
• Faker.js integration with argument handling and fallback methods for unrecognized field types
• Probabilistic field generation for optional data modeling

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
packages/compass-collection/src/components/mock-data-generator-modal/script-generation-utils.ts	Implements the complete script generation engine with type definitions, path parsing, document structure building, and code generation
packages/compass-collection/src/components/mock-data-generator-modal/script-generation-utils.spec.ts	Comprehensive test suite covering all functionality including edge cases, array handling, probability features, and faker argument processing

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[johnjackweir]

why include the empty object? vs simply leaving rootLevelFields as is

[jcobis]

I realize this isn't the most readable but it's conditional rendering using the spread operator ..., so if the probability condition is not met, nothing gets rendered (i.e no empty object). I can add a comment, or potentially refactor this to make it clearer. The advantage of this notation is that it's one line, and there may be many of these

[johnjackweir]

Do we want to cover any more of the allowed datatypes?

some of these would be easy like null, Long, timestamp

[jcobis]

Done. Also changed to explicitly handle null and undefined by passing through those literal values

[addaleax]

@jcobis This doesn't actually generate code to create instances of these types, though ... for example, for Decimal128, you want something like Decimal128.fromStringWithRounding(`${faker.number.float()}`), not just faker.number.float()

It's also honestly a bit unclear here what mongoType actually is – e.g. in what situation would int64 be passed vs. in what situation long? Can we re-use an existing enum here, e.g. TypeCastTypes found elsewhere in the Compass source?

[kpamaran]

I never knew the Function constructor could be used this way. Very cool ✨

[kpamaran]

I see more codeql+copilot suggestions, but otherwise latest diffs lgtm

[addaleax]

Nit, completely optional, but this can be simplified a bit:

Suggested change

	const returnMatch = script.match(/return ([\s\S]*?);[\s]*\}/);
	const returnMatch = script.match(/return (.*?);\s*\}/s);

[addaleax]

^ This still needs to be escaped, ' is a valid character in database and collection names

[addaleax]

@jcobis This doesn't actually generate code to create instances of these types, though ... for example, for Decimal128, you want something like Decimal128.fromStringWithRounding(`${faker.number.float()}`), not just faker.number.float()

It's also honestly a bit unclear here what mongoType actually is – e.g. in what situation would int64 be passed vs. in what situation long? Can we re-use an existing enum here, e.g. TypeCastTypes found elsewhere in the Compass source?