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Add support for with { type: "bytes" } 
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Lines changed: 571 additions & 5 deletions

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‎Makefile.js‎

Lines changed: 2 additions & 2 deletions
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‎Makefile.source.ts‎

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@@ -518,14 +518,14 @@ target["bootstrap-flow"] = function () {
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target["new-version-checklist"] = function () {
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// eslint-disable-next-line no-constant-condition
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if (0) {
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if (1) {
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console.log(
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`
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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!!!!!! !!!!!!
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!!!!!! Write any important message here, and change the !!!!!!
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!!!!!! if (0) above to if (1) !!!!!!
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!!!!!! Update the minVersion for the immutableUint8Array !!!!!!
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!!!!!! helper !!!!!!
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!!!!!! !!!!!!
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!!!!!! !!!!!!
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

‎packages/babel-helpers/src/helpers-generated.ts‎

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@@ -660,6 +660,19 @@ const helpers: Record<string, Helper> = {
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dependencies: {},
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internal: false,
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}),
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// size: 119, gzip size: 105
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immutableUint8Array: helper(
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"8.0.0-rc.2",
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"function _immutableUint8Array(r){var t=r.buffer;return new Uint8Array(t.transferToImmutable?t.transferToImmutable():t)}",
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{
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globals: ["Uint8Array"],
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locals: { _immutableUint8Array: ["body.0.id"] },
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exportBindingAssignments: [],
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exportName: "_immutableUint8Array",
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dependencies: {},
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internal: false,
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},
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),
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// size: 537, gzip size: 258
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importDeferProxy: helper(
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"7.23.0",

‎packages/babel-helpers/src/helpers/immutableUint8Array.ts‎

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@@ -0,0 +1,16 @@
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/* @minVersion 8.0.0-rc.2 */
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declare global {
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interface ArrayBuffer {
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transferToImmutable?(): ArrayBuffer;
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}
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}
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export default function _immutableUint8Array(
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u8orNodeBuffer: Uint8Array<ArrayBuffer>,
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) {
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var buf = u8orNodeBuffer.buffer;
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return new Uint8Array(
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buf.transferToImmutable ? buf.transferToImmutable() : buf,
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);
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}

‎packages/babel-plugin-proposal-bytes-modules/.npmignore‎

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src
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test
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*.log
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tsconfig.json
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tsconfig.tsbuildinfo

‎packages/babel-plugin-proposal-bytes-modules/README.md‎

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‎packages/babel-plugin-proposal-bytes-modules/package.json‎

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{
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"name": "@babel/plugin-proposal-bytes-modules",
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"version": "8.0.0-rc.2",
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"description": "Transform bytes modules imports (`import '...' with { type: 'bytes' }`) to work in browsers and Node.js.",
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"repository": {
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"type": "git",
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"url": "https://github.com/babel/babel.git",
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"directory": "packages/babel-plugin-proposal-bytes-modules"
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},
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"homepage": "https://babel.dev/docs/en/next/babel-plugin-proposal-bytes-modules",
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"license": "MIT",
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"publishConfig": {
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"access": "public"
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},
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"main": "./lib/index.js",
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"exports": {
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".": {
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"types": "./lib/index.d.ts",
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"default": "./lib/index.js"
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},
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"./package.json": "./package.json"
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},
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"keywords": [
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"babel-plugin",
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"import",
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"source",
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"phase",
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"wasm",
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"WebAssembly",
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"assertions",
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"proposal",
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"stage-3"
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],
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"dependencies": {
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"@babel/helper-import-to-platform-api": "workspace:^",
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"@babel/helper-plugin-utils": "workspace:^"
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},
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"peerDependencies": {
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"@babel/core": "workspace:^"
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},
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"devDependencies": {
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"@babel/core": "workspace:^",
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"@babel/helper-plugin-test-runner": "workspace:^",
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"babel-plugin-polyfill-corejs3": "^0.14.0"
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},
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"engines": {
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"node": "^20.19.0 || >=22.12.0"
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},
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"author": "The Babel Team (https://babel.dev/team)",
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"type": "module"
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}

‎packages/babel-plugin-proposal-bytes-modules/src/index.ts‎

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import { declare } from "@babel/helper-plugin-utils";
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import type { types as t, File } from "@babel/core";
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import {
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importToPlatformApi,
5+
buildParallelStaticImports,
6+
type Pieces,
7+
type Builders,
8+
} from "@babel/helper-import-to-platform-api";
9+
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export default declare(api => {
11+
const { types: t, template } = api;
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api.assertVersion(REQUIRED_VERSION("^8.0.0"));
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const targets = api.targets();
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let helperESM: Builders;
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let helperCJS: Builders;
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const transformers: Pieces = {
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webFetch: (fetch, file) =>
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template.expression.ast`
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${fetch}.then(r => r.bytes()).then(${file.addHelper("immutableUint8Array")})
23+
`,
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nodeFsSync: (buf, file) =>
25+
t.callExpression(file.addHelper("immutableUint8Array"), [buf]),
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nodeFsAsync: file => file.addHelper("immutableUint8Array"),
27+
};
28+
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const getHelper = (file: File) => {
30+
const modules = file.get("@babel/plugin-transform-modules-*");
31+
if (modules === "commonjs") {
32+
return (helperCJS ??= importToPlatformApi(targets, transformers, true));
33+
}
34+
if (modules == null) {
35+
return (helperESM ??= importToPlatformApi(targets, transformers, false));
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}
37+
throw new Error(
38+
`@babel/plugin-proposal-bytes-modules can only be used when not ` +
39+
`compiling modules, or when compiling them to CommonJS.`,
40+
);
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};
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function getAttributeKey({ key }: t.ImportAttribute): string {
44+
return t.isIdentifier(key) ? key.name : key.value;
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}
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function hasTypeBytes(attributes: t.ImportAttribute[]) {
48+
return !!attributes?.some(
49+
attr => getAttributeKey(attr) === "type" && attr.value.value === "bytes",
50+
);
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}
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return {
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name: "proposal-bytes-modules",
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visitor: {
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Program(path) {
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if (path.node.sourceType !== "module") return;
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const helper = getHelper(this.file);
61+
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const data = [];
63+
for (const decl of path.get("body")) {
64+
if (!decl.isImportDeclaration()) continue;
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const attributes = decl.node.attributes || undefined;
66+
if (!hasTypeBytes(attributes)) continue;
67+
68+
if (decl.node.phase != null) {
69+
throw decl.buildCodeFrameError(
70+
"Bytes modules do not support phase modifiers.",
71+
);
72+
}
73+
if (attributes.length > 1) {
74+
const paths = decl.get("attributes");
75+
const index = getAttributeKey(attributes[0]) === "type" ? 1 : 0;
76+
throw paths[index].buildCodeFrameError(
77+
"Unknown attribute for bytes modules.",
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);
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}
80+
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let id: t.Identifier;
82+
let needsNS = false;
83+
for (const specifier of decl.get("specifiers")) {
84+
if (specifier.isImportSpecifier()) {
85+
throw specifier.buildCodeFrameError(
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"Bytes modules do not support named imports.",
87+
);
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}
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id = specifier.node.local;
91+
needsNS = specifier.isImportNamespaceSpecifier();
92+
}
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id ??= path.scope.generateUidIdentifier("_");
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let fetch = helper.buildFetch(decl.node.source, this.file);
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if (needsNS) {
98+
if (helper.needsAwait) {
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fetch = template.expression.ast`
100+
${fetch}.then(j => ({ default: j }))
101+
`;
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} else {
103+
fetch = template.expression.ast`{ default: ${fetch} }`;
104+
}
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}
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data.push({ id, fetch });
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decl.remove();
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}
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if (data.length === 0) return;
111+
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const decl = buildParallelStaticImports(data, helper.needsAwait);
113+
if (decl) path.unshiftContainer("body", decl);
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},
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},
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};
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});

‎packages/babel-plugin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration-empty-targets/input.js‎

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import j from "./x" with { type: "bytes" };

‎packages/babel-plugin-proposal-bytes-modules/test/fixtures/browser-and-node-esm/import-declaration-empty-targets/options.json‎

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{
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"sourceType": "module",
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"targets": []
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}

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