refactor(@schematics/angular): add Karma configuration analyzer and comparer #30833
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…omparer Introduces a new utility for analyzing and comparing Karma configuration files. This is a foundational step for migrating from Karma to other testing frameworks like Jest and Vitest, as it allows the migration schematic to understand the user's existing setup. The new `analyzeKarmaConfig` function uses TypeScript's AST parser to safely extract settings from a `karma.conf.js` file. It can identify common patterns, including `require` calls, and flags configurations that are too complex for static analysis. The `compareKarmaConfigs` function provides the ability to diff a user's Karma configuration against a default template. This will be used to determine which custom settings need to be migrated. Known limitations of the analyzer: - It does not resolve variables or complex expressions. Any value that is not a literal (string, number, boolean, array, object) or a direct `require` call will be marked as an unsupported value. - It does not support Karma configuration files that use ES Modules (import/export syntax).
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Introduces a new utility for analyzing and comparing Karma configuration files. This is a foundational step for migrating from Karma to other testing frameworks like Jest and Vitest, as it allows the migration schematic to understand the user's existing setup.
The new
analyzeKarmaConfigfunction uses TypeScript's AST parser to safely extract settings from akarma.conf.jsfile. It can identify common patterns, includingrequirecalls, and flags configurations that are too complex for static analysis.The
compareKarmaConfigsfunction provides the ability to diff a user's Karma configuration against a default template. This will be used to determine which custom settings need to be migrated.Known limitations of the analyzer:
requirecall will be marked as an unsupported value.