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Import bytes proposal #17817

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4 changes: 2 additions & 2 deletions Makefile.js
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Large diffs are not rendered by default.

6 changes: 3 additions & 3 deletions Makefile.source.ts
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Expand Up @@ -529,14 +529,14 @@ target["bootstrap-flow"] = function () {

target["new-version-checklist"] = function () {
// eslint-disable-next-line no-constant-condition
if (0) {
if (1) {
console.log(
`
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!! !!!!!!
!!!!!! Write any important message here, and change the !!!!!!
!!!!!! if (0) above to if (1) !!!!!!
!!!!!! Update the minVersion for the immutableUint8Array !!!!!!
!!!!!! helper !!!!!!
!!!!!! !!!!!!
!!!!!! !!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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13 changes: 13 additions & 0 deletions packages/babel-helpers/src/helpers-generated.ts
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Expand Up @@ -661,6 +661,19 @@ const helpers: Record<string, Helper> = {
dependencies: {},
internal: false,
}),
// size: 119, gzip size: 105
immutableUint8Array: helper(
"8.0.0-rc.2",
"function _immutableUint8Array(r){var t=r.buffer;return new Uint8Array(t.transferToImmutable?t.transferToImmutable():t)}",
{
globals: ["Uint8Array"],
locals: { _immutableUint8Array: ["body.0.id"] },
exportBindingAssignments: [],
exportName: "_immutableUint8Array",
dependencies: {},
internal: false,
},
),
// size: 537, gzip size: 258
importDeferProxy: helper(
"7.23.0",
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16 changes: 16 additions & 0 deletions packages/babel-helpers/src/helpers/immutableUint8Array.ts
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@@ -0,0 +1,16 @@
/* @minVersion 8.0.0-rc.2 */

declare global {
interface ArrayBuffer {
transferToImmutable?(): ArrayBuffer;
}
}

export default function _immutableUint8Array(
u8orNodeBuffer: Uint8Array<ArrayBuffer>,
) {
var buf = u8orNodeBuffer.buffer;
return new Uint8Array(
buf.transferToImmutable ? buf.transferToImmutable() : buf,
);
}
5 changes: 5 additions & 0 deletions packages/babel-plugin-proposal-bytes-modules/.npmignore
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@@ -0,0 +1,5 @@
src
test
*.log
tsconfig.json
tsconfig.tsbuildinfo
19 changes: 19 additions & 0 deletions packages/babel-plugin-proposal-bytes-modules/README.md
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# @babel/plugin-proposal-bytes-modules

> Transform bytes modules imports (`import '...' with { type: 'bytes' }`) to work in browsers and Node.js.

See our website [@babel/plugin-proposal-bytes-modules](https://babeljs.io/docs/babel-plugin-proposal-bytes-modules) for more information.

## Install

Using npm:

```sh
npm install --save-dev @babel/plugin-proposal-bytes-modules
```

or using yarn:

```sh
yarn add @babel/plugin-proposal-bytes-modules --dev
```
51 changes: 51 additions & 0 deletions packages/babel-plugin-proposal-bytes-modules/package.json
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{
"name": "@babel/plugin-proposal-bytes-modules",
"version": "8.0.0-rc.2",
"description": "Transform bytes modules imports (`import '...' with { type: 'bytes' }`) to work in browsers and Node.js.",
"repository": {
"type": "git",
"url": "https://github.com/babel/babel.git",
"directory": "packages/babel-plugin-proposal-bytes-modules"
},
"homepage": "https://babel.dev/docs/en/next/babel-plugin-proposal-bytes-modules",
"license": "MIT",
"publishConfig": {
"access": "public"
},
"main": "./lib/index.js",
"exports": {
".": {
"types": "./lib/index.d.ts",
"default": "./lib/index.js"
},
"./package.json": "./package.json"
},
"keywords": [
"babel-plugin",
"import",
"source",
"phase",
"wasm",
"WebAssembly",
"assertions",
"proposal",
"stage-3"
],
"dependencies": {
"@babel/helper-import-to-platform-api": "workspace:^",
"@babel/helper-plugin-utils": "workspace:^"
},
"peerDependencies": {
"@babel/core": "workspace:^"
},
"devDependencies": {
"@babel/core": "workspace:^",
"@babel/helper-plugin-test-runner": "workspace:^",
"babel-plugin-polyfill-corejs3": "^0.14.0"
},
"engines": {
"node": "^20.19.0 || >=22.12.0"
},
"author": "The Babel Team (https://babel.dev/team)",
"type": "module"
}
117 changes: 117 additions & 0 deletions packages/babel-plugin-proposal-bytes-modules/src/index.ts
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import { declare } from "@babel/helper-plugin-utils";
import type { types as t, File } from "@babel/core";
import {
importToPlatformApi,
buildParallelStaticImports,
type Pieces,
type Builders,
} from "@babel/helper-import-to-platform-api";

export default declare(api => {
const { types: t, template } = api;
api.assertVersion(REQUIRED_VERSION("^8.0.0"));

const targets = api.targets();

let helperESM: Builders;
let helperCJS: Builders;

const transformers: Pieces = {
webFetch: (fetch, file) =>
template.expression.ast`
${fetch}.then(r => r.bytes()).then(${file.addHelper("immutableUint8Array")})
`,
nodeFsSync: (buf, file) =>
t.callExpression(file.addHelper("immutableUint8Array"), [buf]),
nodeFsAsync: file => file.addHelper("immutableUint8Array"),
};

const getHelper = (file: File) => {
const modules = file.get("@babel/plugin-transform-modules-*");
if (modules === "commonjs") {
return (helperCJS ??= importToPlatformApi(targets, transformers, true));
}
if (modules == null) {
return (helperESM ??= importToPlatformApi(targets, transformers, false));
}
throw new Error(
`@babel/plugin-proposal-bytes-modules can only be used when not ` +
`compiling modules, or when compiling them to CommonJS.`,
);
};

function getAttributeKey({ key }: t.ImportAttribute): string {
return t.isIdentifier(key) ? key.name : key.value;
}

function hasTypeBytes(attributes: t.ImportAttribute[]) {
return !!attributes?.some(
attr => getAttributeKey(attr) === "type" && attr.value.value === "bytes",
);
}

return {
name: "proposal-bytes-modules",

visitor: {
Program(path) {
if (path.node.sourceType !== "module") return;

const helper = getHelper(this.file);

const data = [];
for (const decl of path.get("body")) {
if (!decl.isImportDeclaration()) continue;
const attributes = decl.node.attributes || undefined;
if (!hasTypeBytes(attributes)) continue;

if (decl.node.phase != null) {
throw decl.buildCodeFrameError(
"Bytes modules do not support phase modifiers.",
);
}
if (attributes.length > 1) {
const paths = decl.get("attributes");
const index = getAttributeKey(attributes[0]) === "type" ? 1 : 0;
throw paths[index].buildCodeFrameError(
"Unknown attribute for bytes modules.",
);
}

let id: t.Identifier;
let needsNS = false;
for (const specifier of decl.get("specifiers")) {
if (specifier.isImportSpecifier()) {
throw specifier.buildCodeFrameError(
"Bytes modules do not support named imports.",
);
}

id = specifier.node.local;
needsNS = specifier.isImportNamespaceSpecifier();
}
id ??= path.scope.generateUidIdentifier("_");

let fetch = helper.buildFetch(decl.node.source, this.file);

if (needsNS) {
if (helper.needsAwait) {
fetch = template.expression.ast`
${fetch}.then(j => ({ default: j }))
`;
} else {
fetch = template.expression.ast`{ default: ${fetch} }`;
}
}

data.push({ id, fetch });
decl.remove();
}
if (data.length === 0) return;

const decl = buildParallelStaticImports(data, helper.needsAwait);
if (decl) path.unshiftContainer("body", decl);
},
},
};
});
1 change: 1 addition & 0 deletions ...ytes-modules/test/fixtures/browser-and-node-esm/import-declaration-empty-targets/input.js
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import j from "./x" with { type: "bytes" };
4 changes: 4 additions & 0 deletions ...-modules/test/fixtures/browser-and-node-esm/import-declaration-empty-targets/options.json
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{
"sourceType": "module",
"targets": []
}
2 changes: 2 additions & 0 deletions ...es-modules/test/fixtures/browser-and-node-esm/import-declaration-empty-targets/output.mjs
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const j = await (typeof process === "object" && process.versions?.node ? Promise.all([import("fs"), import("module")]).then(([fs, module]) => new Promise((a => (r, j) => fs.readFile(a, (e, d) => e ? j(e) : r(d)))(module.createRequire(import.meta.url).resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve?.("./x") ?? new URL("./x", import.meta.url)).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
3 changes: 3 additions & 0 deletions ...sal-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration-multiple/input.js
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import j from "./x" with { type: "bytes" };
someBody;
import j2 from "./x3" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...l-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration-multiple/output.mjs
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const [j, j2] = await Promise.all([typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array), typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x3")))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x3")).then(r => r.bytes()).then(_immutableUint8Array)]);
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
someBody;
1 change: 1 addition & 0 deletions ...al-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration-namespace/input.js
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import * as ns from "./x" with { type: "bytes" };
4 changes: 4 additions & 0 deletions ...-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration-namespace/output.mjs
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const ns = await (typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array)).then(j => ({
default: j
}));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
1 change: 1 addition & 0 deletions ...gin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration/input.js
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import j from "./x" with { type: "bytes" };
2 changes: 2 additions & 0 deletions ...n-proposal-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration/output.mjs
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const j = await (typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
2 changes: 2 additions & 0 deletions ...ugin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/import-expression/input.js
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// TODO: Not supported yet
let promise = import("./x", { with: { type: "bytes" } });
Comment on lines +1 to +2
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@nicolo-ribaudo nicolo-ribaudo Feb 20, 2026

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We also do not support this for JSON yet.

6 changes: 6 additions & 0 deletions ...in-proposal-bytes-modules/test/fixtures/browser-and-node-esm/import-expression/output.mjs
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// TODO: Not supported yet
let promise = import("./x", {
with: {
type: "bytes"
}
});
1 change: 1 addition & 0 deletions ...modules/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-both/input.js
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import j from "./x" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...les/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-both/options.json
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{
"targets": { "firefox": "90", "node": "20.0" }
}
2 changes: 2 additions & 0 deletions ...dules/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-both/output.mjs
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const j = await (typeof process === "object" && process.versions?.node ? Promise.all([import("fs"), import("module")]).then(([fs, module]) => fs.promises.readFile(module.createRequire(import.meta.url).resolve("./x"))).then(_immutableUint8Array) : fetch(import.meta.resolve?.("./x") ?? new URL("./x", import.meta.url)).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
1 change: 1 addition & 0 deletions ...ules/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-browser/input.js
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import j from "./x" with { type: "bytes" };
3 changes: 3 additions & 0 deletions .../test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-browser/options.json
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{
"targets": { "firefox": "90", "node": "20.6" }
}
2 changes: 2 additions & 0 deletions ...es/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-browser/output.mjs
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const j = await (typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve?.("./x") ?? new URL("./x", import.meta.url)).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
1 change: 1 addition & 0 deletions ...modules/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-node/input.js
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import j from "./x" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...les/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-node/options.json
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{
"targets": { "firefox": "110", "node": "20.0" }
}
2 changes: 2 additions & 0 deletions ...dules/test/fixtures/browser-and-node-esm/import-meta-resolve-fallback-for-node/output.mjs
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const j = await (typeof process === "object" && process.versions?.node ? Promise.all([import("fs"), import("module")]).then(([fs, module]) => fs.promises.readFile(module.createRequire(import.meta.url).resolve("./x"))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
1 change: 1 addition & 0 deletions ...proposal-bytes-modules/test/fixtures/browser-and-node-esm/no-fs-promises-support/input.js
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import j from "./x" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...osal-bytes-modules/test/fixtures/browser-and-node-esm/no-fs-promises-support/options.json
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{
"targets": { "firefox": "110", "node": "9.0" }
}
2 changes: 2 additions & 0 deletions ...oposal-bytes-modules/test/fixtures/browser-and-node-esm/no-fs-promises-support/output.mjs
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const j = await (typeof process === "object" && process.versions?.node ? Promise.all([import("fs"), import("module")]).then(([fs, module]) => new Promise((a => (r, j) => fs.readFile(a, (e, d) => e ? j(e) : r(d)))(module.createRequire(import.meta.url).resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
5 changes: 5 additions & 0 deletions packages/babel-plugin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/options.json
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{
"sourceType": "module",
"targets": { "firefox": "110", "node": "20.6" },
"plugins": ["proposal-bytes-modules"]
}
2 changes: 2 additions & 0 deletions ...lugin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/with-json-import/input.js
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import bytes from "./x" with { type: "bytes" };
import json from "./x" with { type: "json" };
5 changes: 5 additions & 0 deletions ...n-proposal-bytes-modules/test/fixtures/browser-and-node-esm/with-json-import/options.json
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{
"sourceType": "module",
"targets": { "firefox": "110", "node": "20.6" },
"plugins": ["proposal-bytes-modules", "transform-json-modules"]
}
3 changes: 3 additions & 0 deletions ...gin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/with-json-import/output.mjs
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const json = await (typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x")))).then(JSON.parse) : fetch(import.meta.resolve("./x")).then(r => r.json()));
const bytes = await (typeof process === "object" && process.versions?.node ? import("fs").then(fs => fs.promises.readFile(new URL(import.meta.resolve("./x")))).then(_immutableUint8Array) : fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array));
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
3 changes: 3 additions & 0 deletions ...gin-proposal-bytes-modules/test/fixtures/browser-cjs/import-declaration-multiple/input.js
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import j from "./x" with { type: "bytes" };
someBody;
import j2 from "./x2" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...proposal-bytes-modules/test/fixtures/browser-cjs/import-declaration-multiple/options.json
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{
"throws": "Cannot compile to CommonJS, since it would require top-level await."
}
1 change: 1 addition & 0 deletions ...in-proposal-bytes-modules/test/fixtures/browser-cjs/import-declaration-namespace/input.js
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import * as ns from "./x" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...roposal-bytes-modules/test/fixtures/browser-cjs/import-declaration-namespace/options.json
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{
"throws": "Cannot compile to CommonJS, since it would require top-level await."
}
1 change: 1 addition & 0 deletions ...babel-plugin-proposal-bytes-modules/test/fixtures/browser-cjs/import-declaration/input.js
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import j from "./x" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...l-plugin-proposal-bytes-modules/test/fixtures/browser-cjs/import-declaration/options.json
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{
"throws": "Cannot compile to CommonJS, since it would require top-level await."
}
2 changes: 2 additions & 0 deletions .../babel-plugin-proposal-bytes-modules/test/fixtures/browser-cjs/import-expression/input.js
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// TODO: Not supported yet
let promise = import("./x", { with: { type: "bytes" } });
8 changes: 8 additions & 0 deletions ...babel-plugin-proposal-bytes-modules/test/fixtures/browser-cjs/import-expression/output.js
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"use strict";

// TODO: Not supported yet
let promise = import("./x", {
with: {
type: "bytes"
}
});
1 change: 1 addition & 0 deletions ...in-proposal-bytes-modules/test/fixtures/browser-cjs/import-meta-resolve-fallback/input.js
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import j from "./x" with { type: "bytes" };
4 changes: 4 additions & 0 deletions ...roposal-bytes-modules/test/fixtures/browser-cjs/import-meta-resolve-fallback/options.json
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{
"targets": { "firefox": "90" },
"throws": "Cannot compile to CommonJS, since it would require top-level await."
}
5 changes: 5 additions & 0 deletions packages/babel-plugin-proposal-bytes-modules/test/fixtures/browser-cjs/options.json
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{
"sourceType": "module",
"targets": { "firefox": "110" },
"plugins": ["proposal-bytes-modules", "transform-modules-commonjs"]
}
3 changes: 3 additions & 0 deletions ...-plugin-proposal-bytes-modules/test/fixtures/browser/import-declaration-multiple/input.js
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import j from "./x" with { type: "bytes" };
someBody;
import j2 from "./x2" with { type: "bytes" };
3 changes: 3 additions & 0 deletions ...lugin-proposal-bytes-modules/test/fixtures/browser/import-declaration-multiple/output.mjs
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const [j, j2] = await Promise.all([fetch(import.meta.resolve("./x")).then(r => r.bytes()).then(_immutableUint8Array), fetch(import.meta.resolve("./x2")).then(r => r.bytes()).then(_immutableUint8Array)]);
function _immutableUint8Array(r) { var t = r.buffer; return new Uint8Array(t.transferToImmutable ? t.transferToImmutable() : t); }
someBody;
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