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Support Multiple Snapshot Formats in the Node.js Test Runner

The current snapshot implementation in the Node.js Test Runner assumes a single snapshot file format (.snapshot).

However, Node.js itself natively supports multiple module and data formats:

  • .cjs (CommonJS)
  • .mjs (ESM)
  • .js (Both)
  • .json

The test runner already embraces this flexibility for test files themselves (it automatically discovers .js, .cjs, and .mjs test files), so one would expect snapshots to be loadable the same way.

Goal

When resolving a snapshot file, the test runner should support multiple extensions.

Example resolution order:

<test>.snapshot.mjs
<test>.snapshot.cjs
<test>.snapshot.js
<test>.snapshot.json

Example error:

Multiple snapshot files found for test "foo.test.js":
- foo.test.snapshot.mjs
- foo.test.snapshot.json