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index.js
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/**
* Copyright 2020 Google Inc. All Rights Reserved.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const asCompiler = require("assemblyscript/cli/asc");
const { basename, join } = require("path");
const { tmpdir } = require("os");
const fsp = require("fs/promises");
const MARKER = "asc:";
const PREFIX_MATCHER = /^asc:(.+)$/;
const defaultOpts = {
matcher: PREFIX_MATCHER,
compilerOptions: {},
useAsBind: false
};
// This special import contains the `compileStreaming` polyfill.
const SPECIAL_IMPORT = "__rollup-plugin-assemblyscript_compileStreaming";
function asc(opts) {
opts = { ...defaultOpts, ...opts };
return {
name: "assemblyscript",
async resolveId(rawId, importee) {
if (rawId === SPECIAL_IMPORT) {
return SPECIAL_IMPORT;
}
const matches = opts.matcher.exec(rawId);
if (!matches) {
return;
}
const { id } = await this.resolve(matches[1], importee);
this.addWatchFile(id);
return MARKER + id;
},
async load(id) {
if (id === SPECIAL_IMPORT) {
return `
export async function compileStreaming(respP) {
if('compileStreaming' in WebAssembly) {
return WebAssembly.compileStreaming(respP);
}
return respP
.then(resp => resp.arrayBuffer())
.then(buffer => WebAssembly.compile(buffer));
}
`;
}
if (!id.startsWith(MARKER)) {
return;
}
id = id.slice(MARKER.length);
const fileName = basename(id).replace(/\.[^.]+$/, "");
const wasmFileName = `${fileName}.wasm`;
const folder = tmpdir();
const wasmFilePath = join(folder, wasmFileName);
await asCompiler.ready;
await new Promise(async (resolve, reject) => {
const params = [
opts.useAsBind
? [
require.resolve("as-bind/lib/assembly/as-bind.ts"),
"--exportRuntime"
]
: [],
id,
"-b",
wasmFilePath,
...Object.entries(opts.compilerOptions).map(([opt, val]) => {
if (val === true) {
return `--${opt}`;
}
return `--${opt}=${val}`;
}),
opts.fileExtension ? [`--extension`, opts.fileExtension] : []
].flat();
asCompiler.main(params, async err => {
if (err) {
return reject(`${err}`);
}
resolve();
});
});
const source = await fsp.readFile(wasmFilePath);
const referenceId = this.emitFile({
type: "asset",
name: `${fileName}.wasm`,
source
});
if (opts.compilerOptions.sourceMap) {
const sourceMapFileName = wasmFileName + ".map";
const sourceMapFilePath = join(folder, sourceMapFileName);
this.emitFile({
type: "asset",
fileName: `assets/${sourceMapFileName}`,
source: await fsp.readFile(sourceMapFilePath)
});
}
return `
import {compileStreaming} from "${SPECIAL_IMPORT}";
export const wasmUrl = import.meta.ROLLUP_FILE_URL_${referenceId};
export default wasmUrl;
`;
}
};
}
module.exports = { asc, PREFIX_MATCHER };