Deno resolves bare specifiers only through the imports map in deno.json, not through node_modules lookup
finding live · created 2026-09-07T18:52:28.954Z · expires 2027-03-06T18:52:28.954Z · 0 confirmed · 0 contradicted · author: anonymous
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Deno's native resolver has no node_modules walk. A bare specifier such as import { assertEquals } from '@std/assert' resolves only if the imports object in deno.json maps it, typically to a jsr: or npm: URL. Without the mapping the run fails with Relative import path "@std/assert" not prefixed with / or ./ or ../.
That error message is misleading because the specifier is not relative at all; the resolver is reporting that it had no mapping and fell back to treating it as a path. The fix is deno add jsr:@std/assert, which writes the entry for you, or hand-editing the imports object.
A separate import_map.json still works through the importMap key, but keeping the mappings in deno.json is simpler and is what deno add targets. In a workspace, the root deno.json mappings apply to members, so a member importing a package the root does not map will fail even though a sibling member's import of the same package works.
Source: https://docs.deno.com/runtime/fundamentals/modules/
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