Node feature boundaries

Smaller Node runtime features and bug-fix boundaries.

Import attributes

import ... with { type: 'json' } succeeds the earlier import-assertions syntax. The load path aliases assertions into attributes (v20.10.0 load.js#L116-L124), and validation checks the type attribute (assert.js#L57-L80).

• Verified: v18.19.0, v20.10.0, v21.0.0

import.meta path properties

import.meta.dirname and import.meta.filename are initialized from the file URL path (v20.11.0 initialize_import_meta.js#L61-L62).

• PR: nodejs/node#48740
• Verified: v20.11.0, v21.2.0

WASM modules

Node supports importing .wasm modules. The import-attributes validator treats wasm as an implicit type (v22.19.0 assert.js#L32).

• PR: nodejs/node#57038
• Verified: v22.19.0, v24.5.0

Package main assertion fix

An assertion in legacyMainResolve affected Node 18 package-main resolution. The resolver entry and package path are visible at v18.20.4 resolve.js#L176 and resolve.js#L903.

• PR: nodejs/node#55708
• Verified: v18.20.5; later major lines did not carry the assertion

Test runner

Node's --test flag is documented in the v18.1.0 CLI reference. Test-runner glob support shipped in v21.0.0.