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Prettier Test Suite

These test snapshots were extracted from the prettier/prettier repository

Usage

These tests are run as part of the biome_js_formatter test suite but can be explicitly called with cargo test -p biome_js_formatter --test prettier_tests

Setting the REPORT_PRETTIER=1 environment variable when running these tests will emit a report.md file containing an exhaustive difference between the output of biome_js_formatter and Prettier's own snapshots. Setting the REPORT_TYPE=json | markdown environment variable will dictate the format of the report. Setting the environment variable INCOMPATIBLE_ONLY=1 will emit an incompatible_report.md file containing only incompatible test cases.

Updating

Prettier is using Jest to run snapshot tests, and a node.js script is needed to extract these snapshots into plain files for use in the Rust tests. To update the snapshots:

  1. Clone the Prettier git repository locally
  2. Remove all the directories inside crates/biome_js_formatter/tests/specs/prettier to ensure all obsolete tests are removed
  3. Go to crates/biome_formatter_test/src/prettier directory
  4. Install prettier pnpm install
  5. Go to crates/biome_js_formatter/tests/specs/prettier directory
  6. Run node crates/biome_js_formatter/tests/specs/prettier/prepare_tests.js <prettier root directory>