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bun-types: type with { type } imports on TypeScript 7.1 - #41076
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TypeScript 7.1 resolves an import that carries import attributes against
`declare module "*" with { type: "text" }` pattern modules
(microsoft/TypeScript#63931). Add such declarations for Bun's loaders:
text, file, md, markdown, toml, yaml, jsonc, json5, xml, sqlite and html.
Older compilers reject the syntax even with skipLibCheck, so the new
declarations live in ts7.1/ and package.json#typesVersions sends only
TypeScript >= 7.1 to ts7.1/index.d.ts. Every other version keeps loading
index.d.ts unchanged.
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Updated 7:56 PM PT - Aug 31st, 2026
✅ @robobun, your commit 487c918c0a23760e273aba6fb18d0fe435968bf4 passed in 🧪 To try this PR locally: bunx bun-pr 41076That installs a local version of the PR into your bun-41076 --bun |
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Suggested reviewers: Merge Risk: 🔵 Low · up to The PR adds TypeScript 7.1-specific import-attribute typings, but its test dependency range may select a later compiler and stop proving compatibility specifically with TypeScript 7.1. The change is mergeable with explicit owner follow-up to bound the tested compiler range. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the problem, implementation, compatibility behavior, and verification steps. It does not use the exact template headings, but it provides the required information in equivalent sections. Comment |
The TypeScript 7.1 case now includes the top-level fixture files as well as fixture/ts7.1, so the new entry point is exercised against everything bun-types declares, not only the import attribute modules.
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Inline comments:
In `@test/integration/bun-types/bun-types.test.ts`:
- Line 379: Update the TypeScript dependency range passed to
createIsolatedFixture in the affected integration test so it is limited to the
7.1 release, using a bounded range or exact 7.1 version while preserving the
existing fixture setup.
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test/integration/bun-types/bun-types.test.ts
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test/tsconfig.json includes every .ts file under test/, and the repository pins TypeScript 6.0.2, which resolves the fixture through the old entry point and reports 11 errors. The fixture is only meaningful with the compiler that bun-types.test.ts installs for it.
Problem
import html from "./index.html" with { type: "text" }is astringat runtime, but bun-types types an import from its extension only (*.htmlgivesHTMLBundle). Same fortype: "sqlite",type: "toml"and the other loaders. HTML Import Type Definitions Don't Reflect Import Attribute Behavior #25508 was closed for this reason.declare module "*" with { type: "text" } { ... }(Support import attributes on ambient modules microsoft/TypeScript#63931, merged 2026-09-01). An import with attributes resolves to the matching pattern module before the extension.with { type: "text" }on an.htmlfile typed asHTMLBundle) and thets(2307)half of embed sqlite example from docs do not work #25328 (./my.db with { type: "sqlite" }).Fix
packages/bun-types/ts7.1/import-attributes.d.tsdeclares"*" with { type }modules for text, file, md, markdown, toml, yaml, jsonc, json5, xml, sqlite (also withembed: "true") and html, with the shapesextensions.d.tsgives the same loaders.skipLibCheck. Sopackage.json#typesVersionssends>=7.1tots7.1/index.d.ts, which references../index.d.tsplus the new file. Every other version loadsindex.d.tsas before. Verified with 6.0.2, 7.0.2 and atscbuilt from the TS merge commit.type: "json"andtype: "macro"have no declaration on purpose. A matching declaration beats the real file, so./package.json with { type: "json" }would becomeany.test/integration/bun-types/bun-types.test.tstype-checks the whole fixture plusfixture/ts7.1/import-attributes.tsthroughts7.1/index.d.tswithtypescript@>=7.1.0-0. The other cases pass unchanged.Background
declare module "*.txt" { ... }, types every import whose specifier matches.extensions.d.tsuses them for.txt,.toml,.htmland so on.typesVersionspicks a different entry file per TypeScript version. TypeScript compares the range with its major.minor, so>=7.1covers the 7.1 nightlies and the release.Status
typescript@7.1.0-dev.20260901.1(published 2026-09-01 08:38 UTC) is the first nightly with the feature. The "TypeScript 7.1" case passes with it; the earlier red runs used the 20260831 nightly.Notes
Runtime shapes, probed with bun 1.4.1 (one file per attribute to avoid the module cache of #19834):
text:stringdefault export, no named exports.file,base64,dataurl: the absolute path as astringat runtime (the bundler turnsbase64/dataurlinto strings too).md,markdown: rendered HTMLstring.toml,yaml,json,jsonc,json5: the parsed object, default plus named exports for the top-level keys.xml: the compactBun.XML.Documentshape.sqlite: abun:sqliteDatabase.html: anHTMLBundle.css: an empty object. Not declared, browsers givetype: "css"another meaning.wasm: depends on the module. Not declared.Verification of the gate (fake package with the same layout): TS 6.0.2 and 7.0.2 load
index.d.tsand report nothing.typescript@7.1.0-dev.20260831.1(the nightly from before the merge) loadsts7.1/index.d.tsand reports TS1005, which proves the redirect. Atscbuilt from microsoft/TypeScript@253c5e2 (Go 1.26 built from source, because the toolchain proxy is blocked here) type-checks the new fixture withskipLibCheck: falseand exits 0. It also exits 0 withmodule: esnext, withlib.dom, and withtypes: ["bun-types"]. Without the new declarations the same fixture reports 11 errors. A probe with atype: "json"declaration added turned../file.json with { type: "json" }intoany, which is why json is left out.{ type: "sqlite", embed: "true" }is assignable to{ type: "sqlite" }, so theembedform resolves to the sameDatabasedeclaration. The fixture covers it.export =was kept overexport defaultso the attribute module and the matchingextensions.d.tsmodule give the same types, and soanykeeps working for default imports of toml/yaml/jsonc/json5. Named imports from theanymodules report TS2305 in TypeScript today, the same as*.toml.Repository plumbing: prettier 3.6.2 cannot parse the new syntax, so
.prettierignoreskipspackages/bun-types/ts7.1.packages/bun-types/tsconfig.jsonexcludes the folder for the same reason (itsincludeis**/*.ts, and the repository pins typescript 6.0.2), andtest/tsconfig.jsonexcludesintegration/bun-types/fixture/ts7.1, which only types with the compiler the test installs. The bun.com API reference bakespackages/bun-types; if that build parses every.d.tswith a compiler older than 7.1,ts7.1/has to be skipped there too.Follow-up: #40836 adds a
bytesloader. Once it lands,declare module "*" with { type: "bytes" }returningUint8Arraybelongs in the same file.